Holden Colorado Gearbox Problems: Symptoms and Repair Options

Table of Contents

1. Quick Answer: What Are the Common Holden Colorado Gearbox Problems?
2. Holden Colorado Gearbox Problems at a Glance
3. Overview of Colorado Transmission Concerns
4. Identify Your Colorado Generation and Gearbox
5. Holden Colorado Automatic Gearbox Problems
6. Shudder and Vibration
7. Torque Converter Checks
8. Slipping and Changes in Engine Speed
9. Other Automatic Symptoms
10. Holden Colorado Manual Gearbox Problems
11. Fifth Gear Thrust Washer
12. Crunching and Difficult Gear Selection
13. Gear Lever Movement and Selection
14. Is It Really the Gearbox?
15. How a Workshop Investigates the Problem
16. Repair, Reconditioned or Used Unit: What Are the Options?
17. Repair and Replacement Costs in Australia
18. Checking the Correct Maintenance Schedule
19. Holden Colorado Recalls, Customer Programs and the Class Action
20. Checking for a Recall by VIN
21. The Torque Converter Class Action
22. Buying a Used Holden Colorado
23. Holden Colorado Gearbox Quote Checklist
24. Holden Colorado Gearbox Problems FAQs
25. What are the most common Holden Colorado gearbox problems?
26. What gearbox does the Holden Colorado have?
27. Why does my Holden Colorado shudder?
28. Is the Holden Colorado fifth gear thrust washer a recall?
29. Is there a Holden Colorado transmission class action?
30. Can a Holden Colorado automatic gearbox be repaired?
31. How much does Holden Colorado gearbox replacement cost in Australia?
32. Why is my Holden Colorado gear stick loose or wobbly?
33. How often should the Colorado automatic transmission fluid be changed?
34. Who handles Holden Colorado recalls and servicing now that Holden has closed?
35. Should I buy a used Holden Colorado?

Holden Colorado gearbox problems are reported on two different gearboxes, and the sources keep them apart. On the RG Colorado automatic, the reports centre on shudder, vibration and harsh shifts, and a Federal Court class action alleges a design fault in the torque converter of the GM 6L50 automatic that the Colorado uses. Those are allegations, and General Motors has said it does not comment on ongoing litigation. On the manual, an Australian reference site describes a fifth gear thrust washer that could wear and fracture on some 2014 model year five-speed gearboxes. This guide sets out which Colorado has which gearbox, the symptoms reported, what the sources say about causes, how a workshop investigates, the repair options and the costs we could find. Every claim carries its source and date. Where we could not find a reliable answer, such as a Holden service interval for the automatic fluid or an itemised Colorado quote, we say so. For the wider picture on gearbox pricing, see our gearbox replacement cost guide.

Quick Answer: What Are the Common Holden Colorado Gearbox Problems?

• Two gearboxes, two sets of reports: on the automatic, the reports are shudder, vibration, slipping and harsh shifts. On the manual, the reports are a fifth gear thrust washer on some 2014 model year five-speed gearboxes, plus clutch and gear lever complaints. Identify your gearbox before applying anything below.
• Reported automatic symptoms: shuddering under load or at highway speed, slipping or surging, hard or delayed shifting, no drive or reverse, overheating or fluid leaks, and warning lights (a South Australian transmission workshop’s list, last modified 6 May 2026).
• Causes: sources disagree and none is official. CarsGuide’s expert (5 November 2024) pointed to the torque converter, its lock-up operation or, in a manual, the fifth gear thrust washer. The class action alleges a torque converter and torque converter clutch design fault. These are suspicions and allegations, not findings.
• Class action: Maurice Blackburn’s Federal Court case against General Motors Australia and New Zealand lists the Colorado and Colorado 7 with the 6L50 for vehicles acquired in Australia between 1 January 2011 and 24 December 2024. In the firm’s September 2026 update it was at the discovery stage, and we found no settlement or decision.
• Recalls: none of the Colorado recalls we found concerns the gearbox. ACR reports a separate GM customer satisfaction program for the fifth gear thrust washer (November 2016). Check your own VIN.
• Cost: we found no itemised Australian quote for a Colorado gearbox. A Melbourne rebuilder lists a rebuild of an RG automatic at $8,995 including GST for the customer’s own unit (page last modified 5 August 2026). See the cost section for what that figure does and does not include.
• Service interval: we found no Holden or GM interval for the automatic fluid and give none. Check your owner’s manual or logbook.
• Support after the brand closed: Holden’s 17 February 2020 release said it would honour warranties and servicing offers made at the time of sale and would provide servicing and spare parts for at least 10 years.

Holden Colorado Gearbox Problems at a Glance

1. Which Colorado and gearbox

• 2008 to 2012 (RC): Wikipedia, a secondary source, lists a four-speed automatic or five-speed manual with the 3.6 litre petrol V6 and the 3.0 litre turbo-diesel, and a five-speed manual with a 2.4 litre petrol
• From June 2012 (RG): a 2.8 litre Duramax turbo-diesel with a manual or a six-speed automatic (Australian Car Reviews, GoAuto)
• Watch for: sources differ on which model years had a five-speed or a six-speed manual, so confirm yours

2. Automatic symptoms

• Reported: shudder under load or at highway speed, slipping or surging, hard or delayed shifting, fluid leaks, overheating, warning lights and in some cases no drive or reverse
• Watch for: a symptom is a prompt for a mechanic, not a diagnosis

3. Torque converter

• Named by CarsGuide’s expert: the torque converter and its lock-up operation, for a shudder in an automatic (5 November 2024)
• Alleged in the class action: a design fault in the torque converter and torque converter clutch of the 6L50
• Watch for: neither is a finding that your gearbox has this fault

4. Manual issues

• Fifth gear thrust washer: Australian Car Reviews (ACR) reports a GM customer satisfaction program (November 2016) for 2014 model year five-speed manuals
• Other reports: clutch, vibration and loose gear lever entries on CarsGuide, none with a date on the page
• Watch for: a clutch or shifter fault is not a gearbox internal fault

5. Class action and recalls

• Class action: Federal Court, discovery stage in September 2026, allegations only
• Recalls: none for the gearbox in the pages we read
• Watch for: check your VIN, because absence of a recall in our reading is not proof that none exists

6. Cost

• Published figures: an $8,995 rebuild listing, a $3,200 exchange torque converter listing and a general replacement range of roughly $3,000 to $12,000 or more
• Watch for: none is an itemised Colorado quote

Overview of Colorado Transmission Concerns

Holden Colorado transmission problems are discussed in several places, and the sources differ in quality. It helps to know what each one is before relying on it.

What each source is

• CarsGuide’s Colorado gearbox and transmission page: a collection of owner questions with short answers. The entries on the page carry no dates or named authors, the page cites no sources, and its answers are informal and often hedged. Treat it as anecdotal
• CarsGuide answer (5 November 2024): a dated answer to a 2013 Colorado owner whose vehicle shuddered in fifth gear
• Australian Car Reviews (ACR): recall and fault pages for the RC and RG. It says its fault information is based on the experiences of owners and repairers, online sources and technical service bulletins, and it does not cite a source for each item
• Maurice Blackburn and Drive (8 January 2025): the class action, which is a set of allegations by a law firm
• Workshops and rebuilders: businesses that describe symptoms and sell repairs. Their pages are their own claims

What the sources report

• CarsGuide’s page lists owner questions about: a shudder in fifth gear (2013), a manual 2014 LTZ that “didn’t like towing” and had a small gearbox component that could fail, a wobbly gear stick (2015), a gearbox fault in a used 2015 four-wheel drive, and clutch problems
• ACR’s RC page: lists no recalls and no gearbox faults for the 2008 to 2011 Colorado. Its two listed faults are a slow-to-boost turbocharger with an EGR valve staying open and a low-mounted diesel fuel cooler that is vulnerable off-road
• ACR’s RG pages: list four recalls, none for the gearbox, and one fifth gear thrust washer item for 2014 model year five-speed manuals
• The class action: alleges a torque converter and torque converter clutch design fault in the 6L50 automatic

What we could not find

• An official Holden or GM statement on automatic gearbox faults in the Colorado
• Failure rates by model year, kilometres, drive type or load
• A dated Australian source that ranks the causes by how often they happen
• An itemised Australian quote for a Colorado gearbox

The balanced reading is that shudder on the RG automatic is a reported and litigated concern, that the litigation is unresolved, and that we found no data on how many Colorados are affected. A good inspection and a service history tell you more than a badge.

Identify Your Colorado Generation and Gearbox

Holden Colorado RG transmission problems and the problems of the earlier RC are different subjects, so start by working out which one you have. “Transmission” and “gearbox” mean the same thing in everyday use. The difference that matters is automatic versus manual.

Which Colorado has which gearbox (dated sources)

• RC, 2008 to 2012: Wikipedia (a secondary source) lists, for Australia, a 2.4 litre petrol with a five-speed manual, a 3.6 litre Alloytec V6 with a four-speed automatic or five-speed manual, and a 3.0 litre Isuzu 4JJ1-TCX turbo-diesel with a four-speed automatic or five-speed manual. ACR’s RC page names no transmission, so we could not confirm these from a second source
• RG, from June 2012: ACR describes a 2.8 litre turbo-diesel four-cylinder, called Duramax in the first RG and Duramax 2 in the second. It lists the first RG (June 2012) with a five-speed manual or a six-speed automatic, and the second RG (October 2013) with a six-speed manual or a six-speed automatic. GoAuto (22 October 2013) says the 2014 model year update brought a six-speed manual replacing the five-speed, a revised six-speed automatic and a lift in power from 130 kW to 147 kW
• CarsGuide (Andrew Chesterton, 1 July 2019): reviews of 2019 models say the 2.8 litre diesel can be paired with a six-speed manual or a six-speed automatic, with the manual rated at 440 Nm and the engine generally at 500 Nm
• The automatic: the class action documents (Drive, 8 January 2025; Maurice Blackburn) list the Colorado and Colorado 7 with the GM 6L50. Two Australian transmission businesses we read also identify the RG automatic as a 6L50, and one calls it the 6L50E
• A mid-cycle change: ACR says that from July 2016 (model year 2017) the manual’s final drive changed from 3.73:1 to 4.10:1 and a torque converter with a centrifugal pendulum absorber was added to the automatic to reduce noise and vibration. We did not find a source on whether that change affected the shudder reports, so we draw no conclusion

A conflict in the sources

ACR’s recall page describes the thrust washer program as covering “2014 model year” five-speed manuals, while GoAuto’s October 2013 report says the 2014 update brought a six-speed manual. ACR’s own RG review also contradicts itself, with a table listing a five-speed manual for the first RG and a summary calling the manual six-speed. We could not resolve this, so do not assume your year and gearbox from this guide. Confirm the gearbox type and code with a workshop or from your VIN, and ask a dealer which build dates a program covers.

What this guide covers

• Covered: RG and RC automatic and manual gearbox symptoms, causes reported, workshop checks, repair options, costs, maintenance, recalls and the class action
• Not covered: the 3.6 litre V6 and four-speed automatic in detail, four-wheel drive transfer case faults and engine faults. We found no gearbox source for the RC four-speed automatic
• Overseas guidance: we did not use guidance written for overseas Chevrolet Colorados, because we could not confirm it applies to the Australian vehicle

Holden Colorado Automatic Gearbox Problems

Holden Colorado automatic gearbox problems are the most litigated part of this topic. They are also the area where the sources are thinnest on specifics, so this section separates what each source says.

Symptoms reported for the automatic

• A South Australian transmission workshop (last modified 6 May 2026): shuddering under load or at highway speeds, slipping or surging, hard or delayed shifting, no drive or reverse, overheating or fluid leaks, and warning lights or error codes
• The class action (8 January 2025): intermittent transmission shudders, excessive vibrations and harsh gear shifts, plus fluid leakage, accelerated wear of components and greater servicing needs
• CarsGuide (5 November 2024): a shudder in an automatic that happens only in fifth gear
• What this adds up to: the same family of symptoms is reported by a workshop, an expert answer and a law firm. None of them tells you how often it happens

Shudder and Vibration

This is the Holden Colorado transmission shudder most owners search for, and it has several possible causes.

• What is reported: a shudder or vibration, sometimes tied to a particular speed, gear or load. The South Australian workshop describes it under load or at highway speeds
• What CarsGuide’s expert said (5 November 2024): a 2013 Colorado owner reported a shudder at about 1,500 to 1,700 rpm in fifth gear only. The owner had already had the gearbox, engine mounts, shocks and engine wiring checked without a fix. The expert said that because the shudder only happens in fifth gear, mounts, driveshafts or suspension faults are less likely, since those would typically show at the same revs or speed in any gear. For an automatic, the expert suggested the torque converter, how the converter locks up, or the fifth-gear gearset. The expert also noted the answer depends on whether the car is an automatic or a manual, which the owner had not said
• What the class action alleges: a design fault in the torque converter and torque converter clutch, producing shudder, vibration and harsh shifts
• A shudder that is not the gearbox: the CarsGuide answer lists mounts, driveshafts and suspension as things a different pattern would point to. A separate CarsGuide answer (4 December 2021) on a noise that changed when four-wheel drive was engaged pointed to the transfer case and front driveline and not the gearbox

Shudder when towing

We found no source that studies a Holden Colorado shudder when towing. What the sources do connect to load:

• Rated towing capacity: ACR and GoAuto both give 3.5 tonnes braked for the RG
• Manual under towing load: CarsGuide’s page says a manual 2014 LTZ “didn’t like towing”, and the 5 November 2024 answer says a fifth gear thrust washer could fracture under heavy towing loads
• Heat claims from sellers: a Queensland tuning workshop selling a cooler kit says it “prevents overheating when towing or carrying heavy loads” and will “reduce transmission temperatures and extend gearbox life”. That is a seller’s claim with no figures or test results on the page
• What to do: note whether the shudder happens only when towing or loaded, at what speed or gear, and whether the gearbox is an automatic or manual. That detail helps a workshop more than the word “shudder”

Torque Converter Checks

A torque converter sits between the engine and an automatic gearbox, and the sources link it to shudder, but they do not agree on how often it is the cause.

• CarsGuide’s expert (5 November 2024): suggested checking the torque converter and how the converter locks up
• The class action (Maurice Blackburn, Drive 8 January 2025): alleges a design fault in the torque converter and torque converter clutch of the 6L50
• A Melbourne rebuilder (page last modified 5 August 2026): its RG automatic rebuild listing includes a billet triple plate lock-up torque converter and says torque converters “have been rebuilt and upgraded”. That is a description of its own product and not evidence of a fault
• A South Australian transmission workshop (6 May 2026): lists upgraded torque converters as an option and does not describe the converter as a fault
• Not every shudder is the converter: the CarsGuide expert also named the fifth-gear gearset, and the answer for a manual points to a thrust washer. Treat the converter as one candidate a workshop should test, not a conclusion

Questions to ask about the converter

• What test showed the converter, as opposed to the gearbox internals or a mount?
• Was the fluid checked for condition and level before any parts were quoted?
• What does the quote include if the converter is replaced or exchanged?

Slipping and Changes in Engine Speed

• What is reported: the South Australian workshop lists slipping or surging among its signs
• What the class action alleges: accelerated wear of transmission components
• A design feature that can change engine speed: ACR’s RG review says the second RG’s recalibrated automatic added a shift stabilisation function for hill ascents and descents, which it says prevented unnecessary gearshifts. We found no source that describes what normal engine speed looks like, so a workshop may need to compare against a known good vehicle
• What this does not prove: rising revs alone cannot separate a gearbox problem from a fluid level problem or an engine problem. Ask what was tested

Other Automatic Symptoms

• Hard or delayed shifting and no drive or reverse: listed by the South Australian workshop, with no cause given for each
• Fluid leaks and overheating: listed together by the workshop, and the class action alleges fluid leakage. We found no source that ties a particular leak point to the Colorado
• Warning lights and error codes: listed by the workshop. A code points a workshop where to look and does not confirm a failed part
• If the Colorado will not move in Drive or Reverse: we found no Colorado source on how far or how long it is safe to drive. We give none. Have it checked before driving further

What to tell the workshop

• When it happens (from rest, at a certain speed or gear, hills, towing, after a long drive)
• Whether warning lights appeared
• The service history, especially when the automatic fluid was last changed and what fluid was used
• Any leaks or top-ups
• Whether the vehicle has towed, carried heavy loads or been driven in hot conditions

Holden Colorado Manual Gearbox Problems

Holden Colorado manual gearbox problems are documented differently from the automatic. The best-sourced item is a specific part in some five-speed gearboxes, and the other reports are individual owner questions. Do not generalise an individual report to every Colorado. Verify the exact gearbox and model year before applying any of this to your vehicle.

What the sources report for manuals

• Fifth gear thrust washer: ACR reports a GM customer satisfaction program (November 2016) for 2014 model year five-speed manuals. CarsGuide (5 November 2024) describes the same part
• Clutch complaints: CarsGuide’s Colorado page lists a 2011 Colorado with a clutch pedal staying on the floor, a 2013 LTZ with a clutch noted as a weak point on manual versions, and vibration around 3,000 rpm in most gears with the clutch suggested as a source. The entries carry no dates on the page
• Towing: a manual 2014 LTZ “didn’t like towing” and had a small gearbox component that could fail, requiring a new gearbox, in one CarsGuide answer
• Gear lever looseness: a 2015 Colorado with a wobbly gear stick (see below)
• Reviewer’s impression: GoAuto’s launch review of the 2014 model (22 October 2013) described the manual as having a long throw and shifts that felt rougher than a passenger vehicle’s. That is a comment on feel and not a fault report

Fifth Gear Thrust Washer

• What ACR says: under heavy loads at high speed, the fifth gear thrust washer “could wear and fracture”. It describes the result as fifth gear jump-out and rear wheel lockup, and says the transmission was to be replaced. It names the item GM Customer Satisfaction Program A151702040 ZCSP, dated November 2016, for the 2014 model year five-speed manual
• What CarsGuide says (5 November 2024): a fifth gear thrust washer can crack under heavy towing loads, the car can jump out of fifth gear and lock the rear wheels, and Holden historically replaced the whole gearbox on affected vehicles. The answer suggests checking with a Holden service centre to see whether a car falls within the affected batch. The same answer says some Colorados were fitted with five-speed manuals that had a problem with the thrust washer on fifth gear
• A conflict to note: GoAuto (22 October 2013) says the 2014 update brought a six-speed manual in place of the five-speed. ACR’s description refers to a five-speed manual in the 2014 model year. We could not reconcile the two, which is why we suggest checking by VIN and build date
• What we could not verify: the program’s terms, which vehicles it covers, how many were affected and whether it is still open. ACR lists it as a customer satisfaction program and not among its four recalls
• If you own a manual from this period: tell the workshop if the gearbox has jumped out of fifth, if the rear wheels have locked or if a shudder happens only in fifth gear. We found no Colorado source on how to use the vehicle safely in the meantime, so we give none

Crunching and Difficult Gear Selection

• What we found: no Colorado source in the pages we read describes crunching gears specifically, and we give no cause for it
• What is reported nearby: CarsGuide’s page covers a clutch pedal that stayed on the floor in a 2011 Colorado (the answer suggested a pressure plate failure and said the gearbox would need removing to diagnose it), a clutch noted as a weak point on a 2013 LTZ, and vibration around 3,000 rpm in most gears with the clutch suggested as a possible source. Those are clutch topics and not gear selection reports
• Why this matters: difficult selection or a crunch has to be traced to the clutch, the shifter and its linkage or the gearbox itself. A symptom alone does not say which. Ask the workshop to say what was tested and what each test showed

What to tell the workshop

• Which gears are affected and whether it happens cold, hot or both
• How the clutch pedal feels, and whether it has changed
• Whether the problem is worse when towing or loaded
• The service history, including any clutch work and any gearbox or program work

Gear Lever Movement and Selection

• What is reported: a CarsGuide answer on a 2015 Colorado with a wobbly gear stick pointed to worn shifter pivots, or a loose shifter or failed gasket where the shifter mounts to the gearbox. It suggested dismantling the shifter and replacing its bushes, or tightening or replacing the mounting gasket
• What this tells you: one answer to one owner. It points at the shifter and its mounting and not at the gearbox internals. The entry on CarsGuide’s page carries no date
• What to do: ask a workshop to inspect the shifter, bushes and mounting before anyone suggests a gearbox repair. We found no source that ties a loose gear stick on a Colorado to internal wear

Is It Really the Gearbox?

A shudder, vibration or noise in a Colorado is not always the gearbox, and the sources offer examples.

• Not gear-specific: the CarsGuide expert (5 November 2024) said a shudder that appears at the same revs or speed in any gear would typically point to mounts, driveshafts or suspension, which is why a shudder only in fifth gear pointed elsewhere
• Transfer case and front driveline: a CarsGuide answer (4 December 2021) on a noise that changed when four-wheel drive was engaged pointed to the transfer case and front driveline and not the gearbox
• Clutch: CarsGuide entries on manual Colorados cover clutch pedal and vibration complaints
• Lesson: describe the symptom precisely and ask for a diagnosis before accepting a quote for a gearbox

How a Workshop Investigates the Problem

A diagnosis should come before a quote for parts. We found no Colorado-specific description of a workshop process, so this section is a guide to what a good assessment should tell you and not a claim about any one workshop.

What a good assessment should tell you

• What was tested and what each test showed
• The fluid condition and level for an automatic, and whether there is a leak
• Which codes were stored, and what the workshop says each one means, noting that a code alone does not confirm a failed part
• Whether the problem is in the gearbox or somewhere else, such as the clutch, a mount, the transfer case or the front driveline
• What the options are, from a service to a replacement, with a price for each

Where else to start

• A Holden service centre: the 5 November 2024 CarsGuide answer suggests checking with one on the thrust washer batch. Holden’s 17 February 2020 release said it planned to offer dealers the opportunity to continue as authorised service outlets
• A transmission specialist: a South Australian workshop says all work is pre-approved by you. Whatever workshop you choose, ask for approval of any extra work in writing

Questions to ask

• What did you test, and what did you find?
• Is the fault inside the gearbox or elsewhere, and how do you know?
• Which repair options did you consider, and why this one?
• What happens to the price if you find more wear once the unit is open?

Repair, Reconditioned or Used Unit: What Are the Options?

The sources describe businesses selling repairs and parts. None gives independent data on how often each option works.

Options described

• Fluid, cooler and pan: a Queensland tuning workshop sells a heavy-duty transmission oil cooler kit for the 6L50 Colorado. A Melbourne rebuilder lists a cooler kit of the same name, a deep cast pan and transmission fluid. A South Australian workshop lists coolers as an upgrade
• Torque converter: the Melbourne rebuilder lists an exchange billet heavy-duty torque converter. The South Australian workshop lists upgraded converters
• Rebuild: the Melbourne rebuilder lists a rebuild of the customer’s own RG automatic, including a torque converter. The South Australian workshop lists heavy-duty rebuilds for towing and four-wheel drive
• Shift kits and reprogramming: the South Australian workshop lists shift kits for “firmer, faster gear changes” and reprogramming and tuning “where applicable”
• Manual thrust washer: ACR’s description of the program says the transmission was to be replaced

Limits of the evidence

• Every option above is described by a business that sells it, and the benefit claims, such as lower temperatures or longer gearbox life, come with no figures or test results on the pages we read
• A tune or upgrade changes how the vehicle behaves. Ask how it is documented and how it affects any existing warranty
• We found no independent success rate for any option, and no Colorado source on a used or reconditioned unit

If a replacement unit is on the table

• Match the unit: generation, engine, two- or four-wheel drive, automatic or manual, and the transmission code. A listing that says only “auto” does not confirm a 6L50
• Ask what was done: new, used or reconditioned can mean very different things, so ask what was tested or replaced and whether it is documented
• Ask about the converter: whether the unit comes with a torque converter, and what condition it is in
• Ask about terms: warranty length, what it excludes, returns and who pays for labour and freight
• Our gearbox replacement cost guide explains how to compare new, used and reconditioned units

Repair and Replacement Costs in Australia

We found no itemised Australian quote for a Holden Colorado gearbox repair or replacement. We also found no dated price for a used or reconditioned Colorado gearbox, automatic or manual, and no verified labour hours. The figures below are what we did find. Each has limits, and none is a quote.

1. A Melbourne rebuilder’s rebuild listing

• Figure: $8,995 including GST for an “Extreme PLUS” rebuild of an RG 2.8 litre diesel Colorado, Colorado 7 or Trailblazer six-speed automatic (the page names the unit as the GM 6L50E), with a 12 month, unlimited kilometre warranty (page last modified 5 August 2026)
• What it includes, per the page: a deep cast transmission pan, a valve body and pump assembly, gasket, seal and ring sets, new clutch frictions, bushes, an oil filter, a billet triple plate lock-up torque converter, a remachined channel surface and a high-temperature epoxy enamel finish
• Terms on the page: it is a rebuild of the customer’s own unit, and the price applies only if the transmission is rebuildable. The page gives a 10 week lead time, says delivery is only to a business that can unload a pallet from a truck, and excludes competition vehicles and off-road events from the warranty. The warranty gives repair or replacement at the rebuilder’s option and does not cover loss of use, towing or recovery
• Limit: it is a business listing, not a quote for your vehicle. The page does not mention installation or a core charge, so we do not know whether removal and refitting are included

2. The same business’s parts listings

• Figures: an exchange billet heavy-duty torque converter at $3,200, a heavy-duty cooler kit at $520 and a deep cast pan at $782, all including GST (listing page last modified 25 June 2025). A cooler kit of the same name and price appears on the Queensland workshop’s page, undated
• Limit: these are parts prices and not fitted prices. The benefit claims are the sellers’ own

3. General gearbox ranges

• Figures: in our gearbox replacement cost guide, a national repairer’s undated page gives roughly $3,000 to $12,000 or more for a replacement, $1,800 to $3,500 plus labour and installation for a reconditioned unit and roughly $200 to $1,000 or more for basic repairs
• Limit: these are not specific to the Colorado, to an automatic or to a diesel four-wheel drive

What we did not find

• A dated price for a used or reconditioned Colorado automatic or manual gearbox
• A Holden or GM price for a new unit
• Labour hours or an hourly rate for a Colorado gearbox swap
• A cost for the manual thrust washer repair outside the program

Why the figures disagree

A rebuild of your own unit, an exchange torque converter and a general replacement range are different jobs and different kinds of evidence. The useful comparison is between itemised quotes for your own vehicle, with the same inclusions.

What changes the price

• Generation and gearbox code: the unit has to match your vehicle
• Drive layout: two- or four-wheel drive
• Own unit or exchange: a rebuild of your own unit depends on its condition, and the Melbourne listing says it applies only if the unit is rebuildable
• New, reconditioned or used: and what was tested, replaced or documented
• What is included: torque converter, valve body, cooler, fluid and any programming
• Labour: hours and hourly rate, shown separately. We have no verified hours for a Colorado
• Freight and GST: the Melbourne listing says GST is included and that delivery is to a business that can unload a pallet. Other sources do not say
• Lead time: the rebuild listing gives 10 weeks, which may matter if you need the vehicle back
• Warranty: length and exclusions

Parts only versus fitted

• Parts only: the unit or part price, with freight, GST and extras separate
• Fitted: the unit plus labour, fluid and any other work found
• Not assumed: do not assume a fitted quote includes a new cooler, torque converter or valve body. Ask for the list

If your Colorado is still under warranty

• Holden’s 17 February 2020 release (as republished by Marque News) said the company would honour all warranties and servicing offers made at the time of sale
• We did not find Holden’s warranty terms for the Colorado and do not state them. Check your logbook, and ask a dealer or GM before paying for work yourself

Checking the Correct Maintenance Schedule

We give no universal service interval, because we found none from Holden or GM Australia for the Colorado’s automatic fluid or manual gear oil.

What the sources say

• Holden’s 17 February 2020 release: it committed to “servicing and spare parts for at least 10 years” and to continuing to handle recalls and safety-related issues
• Workshops and rebuilders: the South Australian workshop and the Melbourne rebuilder give no fluid interval on the pages we read. The rebuilder sells a full synthetic transmission fluid and does not state a specification for the Colorado

What to do

• Read the schedule in your owner’s manual or logbook, or ask a dealer or experienced service outlet
• Find out whether the automatic fluid has ever been changed, and what fluid was used
• Keep every service record. Receipts, fault codes and quotes help in any warranty, resale or claim discussion

Holden Colorado Recalls, Customer Programs and the Class Action

Checking for a Recall by VIN

A search phrase does not show that a recall exists. Check your own VIN.

• The Australian Government register: vehiclerecalls.gov.au. ACR lists the thrust washer item as a customer satisfaction program and not as a recall, so also ask a dealer about programs
• A dealer or service outlet: Holden’s 17 February 2020 release said Holden and its aftersales network would continue to handle recalls and safety-related issues. We could not confirm how that works in 2026

Colorado recalls we found, none for the gearbox

• REC-000537 (PRA 2015/14657): the alternator B+ cable may have been assembled in contact with a steel bracket at the battery tray, affecting 26,170 Colorados. ACR dates it April 2015
• REC-000490 (PRA 2014/14370): the third-row seat belt retractor lock sensing mechanism may not meet an Australian Design Rule requirement, affecting 3,075 Colorados. Practical Motoring (14 October 2014) says it covers the seven-seat RG built from 24 January 2012 to 24 September 2014
• ACR’s RG utility list: a rear seatbelt anchor bolt (July 2015, PRA 2015/14806), a front seatbelt retractor bolt (September 2016, PRA 2016/15618) and service replacement jacks lacking a safety label (June 2017, PRA 2017/16099)
• ACR’s RC page: says no recall information is available for the 2008 to 2011 Colorado

What we could not read or verify

• ACR’s Colorado 7 and cab chassis pages and CarsGuide’s Colorado recall page were not read, and we did not search the government register by model
• The terms of the thrust washer program
• A recall absent from the pages we read is not proof that none exists

The Torque Converter Class Action

• What it is: a class action by Maurice Blackburn in the Federal Court of Australia against General Motors Australia and New Zealand Pty Ltd, announced on 8 January 2025 and reported by Drive the same day
• Who is covered: people who acquired an affected vehicle in Australia between 1 January 2011 and 24 December 2024. The affected vehicles use a GM 6L45, 6L50 or 6L80 transmission, and the Colorado and Colorado 7 are listed with the 6L50
• A caution on model years: the lists differ between the sources we read. The firm’s case page lists the Colorado 7 for model years 2012 to 2016 and the Colorado for model years 2012 to 2020. Drive’s table (8 January 2025) lists the Colorado for model years 2017 to 2020. The firm’s media statement lists two Colorado entries, model years 2012 to 2016 and 2016 to 2020. Check the firm’s current list for your vehicle
• What is alleged: the transmissions are defective due to a design fault in the torque converter and torque converter clutch. Reported effects include intermittent shudders, excessive vibration, harsh gear shifts, fluid leakage, accelerated wear of components and greater servicing needs. The claim also alleges a breach of the Australian Consumer Law guarantee of acceptable quality and misleading or deceptive conduct
• GM’s response: a spokesperson said GM does not comment on ongoing litigation (Drive, 8 January 2025)
• Status: the firm’s case page, in its September 2026 update, says both sides have filed pleadings and the case is at discovery. An application by the applicant for further data discovery was listed for hearing on 22 October 2026 before a Federal Court Registrar. The firm says a trial date is likely some time away. We did not find a report of the hearing’s outcome, a settlement or a decision
• Who can register: the firm and Drive say owners who have sold the vehicle, had it written off or never had a problem can still register if they acquired it in the period. The firm’s page says signing up will not expose you to upfront costs and explains how costs are handled. It gave no registration deadline and warns that limitation periods apply to claims not yet covered
• What this is not: it is not a finding that any Colorado is faulty, and it is not a recall. It does not tell you whether to repair, replace or sell. We are not lawyers, so read the firm’s page or take advice if you want to understand your position
• A practical step: keep your service records, repair invoices and any fault codes. They are useful for a warranty discussion, a sale or a claim

Buying a Used Holden Colorado

We found no overall reliability verdict from a dated Australian source for the Colorado gearbox, and the sources we read do not rank the model. These checks follow from what the sources report.

• Identify the gearbox: automatic or manual, and which one. Confirm by VIN and code, because sources differ on which model years had which manual
• Service history: ask for a full history, and ask when the automatic fluid was last changed and what fluid was used. We found no Holden interval, so if someone says the fluid never needs changing, ask to see that in the manual or logbook
• Drive and note: a shudder at a particular speed or gear, harsh or delayed shifts, slipping or surging, leaks and warning lights. A short drive does not replace an inspection
• Manual from around 2014: ask whether the thrust washer program was done on that vehicle, and ask a dealer to check the VIN
• Recalls: check the VIN on the government register and ask a dealer
• Class action: the firm described an eligibility period that ended on 24 December 2024. Ask the firm how it applies to a vehicle you are buying now
• If a fault appears after purchase: a CarsGuide answer on a used 2015 four-wheel drive Colorado with a gearbox fault suggested contacting Consumer Affairs and asking the diagnosing specialist whether the fault predated the sale. That is one answer and not legal advice

Our guide on what to check on a used 4×4 covers the wider inspection.

Holden Colorado Gearbox Quote Checklist

Ask for each of these in writing and confirm it against the actual quote.

• Diagnosis: what was tested, what was found and why it points to the gearbox
• Vehicle details: VIN, generation, engine, drive layout, automatic or manual and the transmission code
• Fault codes: which were stored, and what the workshop says they mean
• Options: service, cooler, torque converter, rebuild of your own unit, reconditioned unit, used unit or new unit, each priced
• Unit details: new, used or reconditioned, kilometres if used, and what was tested or replaced
• Inclusions: torque converter, valve body, cooler, pan, fluid and any programming
• Fluid: the exact specification and brand
• Labour: hours and hourly rate, shown separately
• Warranty: length, kilometres, what it excludes and who honours it
• Tax and freight: whether the price includes GST and delivery, and the lead time
• Own unit or exchange: what happens if your unit cannot be rebuilt
• Additional work: what happens if more wear is found once the unit is open

The Western Australian Consumer Protection page (updated 4 December 2023) advises asking for a written quote or estimate detailing the work and cost, says an accepted quote forms a contract binding both sides, and says you should not automatically authorise additional repairs. It also says the Australian Consumer Law requires repairs to be done with due care and skill, including when second-hand parts are used. That page covers Western Australia, so check your own state’s consumer affairs body.

Holden Colorado Gearbox Problems FAQs