GM is receiving damaged (cracked or broken) transmission cores returned to the reman facilities. The damage is being caused either in the removal process by the technician, or inadequate packaging or shipping. This bulletin advises the dealers to be more careful not to damage the transmissions during removal and to package the core properly for return.
full bulletin at NHTSA ↗2006 Chevrolet Colorado powertrain problems
severe 10 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Complaints
10
Recalls
0
Avg fix
$2,500
1crash
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering powertrain on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
This bulletin provides information on the harmful effects of water or ethylene glycol in transmission fluid.
full bulletin at NHTSA ↗This Warranty Admin service bulletin provides guidelines for Dealers Not Required and for Dealers Required to Contact the PQC for engine or transmission assembly replacement and explains the PQC process, GWM Transaction submission, vehicle service record retention and proper handling of assembly returns for Canadian Dealers only.
full bulletin at NHTSA ↗This PI bulletin advises the technician on the proper way to install the pistons in an engine.
full bulletin at NHTSA ↗This service bulletin provides a vibration analysis worksheet the technician can use in conjunction with the appropriate Vibration Analysis-Road testing procedure when diagnosing vibration concerns.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2006 Colorado's most alarming complaint is unprompted 4WD High engagement that seizes the front wheels and eliminates steering control. Owners describe it happening randomly, often during turns, at all speeds including highways. One vehicle exhibited the problem from 2,109 miles and visited the dealer 15+ times without resolution; the dealership eventually told the owner GM had no cure and stopped servicing it. Another owner's replacement truck developed the identical fault two weeks after purchase, and a computer chip replacement didn't prevent recurrence. A third owner experienced it at highway speed entering a parking lot and was told by the dealer it was normal truck behavior—the owner was advised to file a complaint if unsatisfied, but said nothing would happen due to recall-scale scope. No audible warning sounds when the mode engages; the button is easy to hit unintentionally.
Engine problems include misfires and stalling during tight low-speed turns, traced by one owner to a bad valve seat; GM declined to repair it under warranty, and the owner paid out of pocket. Another vehicle suffered complete engine shutdown at 70 mph, repeated several times with restart delays, at 180,000 miles; the manufacturer stated no recall applied.
Transmission issues span a loose gear-shift lever that left the truck in forward gear when the driver aimed for Park, causing unintended acceleration and a building crash—GM denied the warranty claim despite the vehicle being five years and under 50,000 miles. A column shifter defect prevents engaging Park; the vehicle can only be parked in Reverse with the key removable.
One front universal joint failed prematurely at 51,000 miles on a well-maintained truck.
Same Chevrolet Colorado powertrain reports on nearby years: 2005
Failure modes owners describe
4WD High mode engages without warning
4WD High mode engages spontaneously and randomly, often during turns or lane changes. Front wheels lock up when engaged, causing complete loss of steering control. Owners report the issue happens at all speeds including highway, sometimes recurring repeatedly on the same vehicle.
When: Random occurrences from as low as 2,109 miles; happens repeatedly throughout vehicle ownership
Symptoms owners cite: 4WD High mode engages unprompted; Front end lockup or front wheels seize; Steering becomes unresponsive or locked; Brakes lock up; Occurs especially during right-hand turns; No audible warning to driver when mode engages
Repairs/costs cited: Dealers reported replacing computer parts or chips; replacements did not solve the recurring problem. Multiple visits (11+ reported on one vehicle, 15+ on another) failed to isolate the defect. GM reportedly told dealers they had no cure for this issue and directed them to stop servicing vehicles with this complaint.
Recalls/TSBs owners mention: Dealer stated no recall exists. GM Detroit directed dealers to cease servicing for this problem, citing no available cure. Warranty claims were denied on some vehicles.
Engine stalling and misfiring under load
Engine misfires and stalls when making tight turns at low speeds. One owner identified a bad valve seat as the root cause. Reports suggest valve seat defects are a recurring problem across multiple vehicles.
When: During low-speed cornering maneuvers
Symptoms owners cite: Engine misfire; Engine stalling during tight turns at low speeds
Codes mentioned: P0017
Repairs/costs cited: One owner paid out of pocket to replace the bad valve seat after GM declined to repair. Complaint mentions others reported bad valve seats as well.
Recalls/TSBs owners mention: GM declined warranty repair on at least one vehicle.
Sudden engine shutdown while driving
Engine loses power and shuts off without warning while vehicle is in motion at highway speeds. Vehicle restarts after a few minutes but failure recurs multiple times.
When: At approximately 180,000 miles
Symptoms owners cite: Complete loss of engine power; Engine shuts off while driving at 70 mph; Vehicle restarts after a few minutes; Failure recurs multiple times
Repairs/costs cited: No repair was completed; vehicle was not serviced after diagnostic appointment was made.
Recalls/TSBs owners mention: Manufacturer stated no recall applies.
Front universal joint premature failure
Front universal joint fails prematurely at low mileage. Owner reports this should not occur on this model and suspects defective manufacturing.
When: At approximately 51,000 miles
Symptoms owners cite: Front universal joint failure
Repairs/costs cited: Identified by experienced mechanics as premature; owner suspects factory defect.
Column shifter stuck out of Park
Automatic transmission column shifter fails to engage or hold Park position. Vehicle can only be parked in Reverse, and the key can be removed in Reverse, creating a safety hazard. Requires turning key back on and shifting to Neutral to restart.
When: Unspecified mileage
Symptoms owners cite: Shifter will not go into Park position; Key can be removed while in Reverse; Cannot shut off vehicle properly in Park
Transmission gear shift lever loose; unintended acceleration
Gear shift lever becomes loose, leaving transmission in forward gear when driver intends to shift to Park. Vehicle accelerates unintentionally, resulting in crash through building. Wrecker service confirmed loose shifter left transmission in forward position. GM denied warranty coverage despite vehicle being within five-year, 50,000-mile warranty period.
When: Within first 50,000 miles
Symptoms owners cite: Loose gear shift lever; Transmission remains in forward gear despite driver input; Unintended acceleration; Vehicle crashes through building
Repairs/costs cited: Wrecker service identified loose shifter as root cause.
Recalls/TSBs owners mention: GM denied warranty claim despite vehicle being within five-year, 50,000-mile warranty period.
Synthesized from 10 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 0 most recent
Had powertrain trouble with your 2006 Chevrolet Colorado?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the powertrain problem on the 2006 Chevrolet Colorado?
It's a meaningful issue. 10 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $2,500.
At what mileage does the powertrain typically fail?
Based on the 10 complaints filed, powertrain issues most often appear around 59,600 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
What does it cost to fix?
Independent shops typically charge around $2,500 for powertrain repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to powertrain?
No active recalls currently cover powertrain issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2006/Chevrolet/Colorado.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.