2004 Chevrolet Trailblazer EXT Transmission and drivetrain Problems
- Complaints
- 17about this part
- Share
- 7%of 261 total for the year
- Median mileage
- 65,465miles
- Trend
- StableComplaints filed in the last 3 full calendar years are within 25% of the 3 years before.
NHTSA recorded 17 complaints about the transmission and drivetrain of the 2004 Chevrolet Trailblazer EXT, 7% of the 261 complaints for this model year. Where a mileage was given, the median is 65,465 miles. 1 a fire, according to the filers.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“Automatic transmission slips when it tries to shift into 3rd or 4th gear, I read that there was a report on this happening but there was not a recall as far as I know, I recently purchased this vehicle from the original owner who says they never received any paper work from GM about doing repairs. My question is will GM repair this condition at no cost to me?”
NHTSA complaint #10955188, filed 2017-02, 136,000 miles“The reverse transmission bell housing blows out. This is the second Chevrolet vehicle I have owned and the same problem on both the first time $2400.00 later it was fixed,and now $2200.00 later the problem will be fixed. I know of 3 people so far that have had the same problem. I will assure you this will be the last Chevrolet vehicle I will buy unless this problem is fixed. Please respond.”
NHTSA complaint #10211961, filed 2007-12, 71,256 miles“2004 trailblazer , transmission dipstick rusted and broke, transmission went out from water getting inside / do not know how this could have happened ! And the bearings in the waterpump went out leaving the fan shaft wiggling / loose. With only 65000 miles on my trailblazer not traveling no faster than 75 MPH max. This should not have happened. My friends with the same trailblazer is having the same thing happening. I serviced every 3500 miles since owned 2005. Please help if can .”
NHTSA complaint #10262521, filed 2009-03, 65,459 miles“Full destruction because of fire I was on the way back from a long trip in southern chile (up to ushuaia) over the carretera austral and, after about 9'000 km drive without any problem, I saw a white smoke back my vehicle. Oil pressure: normal, motor temperature: normal. This meant immediate stop along the ruta 40 norte in argentina (about 100 km north of bariloche, on the way to neuqu). While stopping, I felt the brake pedal just going without immediate reaction but the pression came back. …”
NHTSA complaint #10149632, filed 2006-02, 24,100 miles“Car felt stuck in gear, wouldn't accelerate, low on transmission fluid. Added more fluid, replaced speed sensor, camshaft & crankshaft sensors. Still having issues with rpms going high, car slamming from one gear into another. Also cannot run heat while driving, fan draws power & causes engine to stall out. Car also burning through gas very quickly.”
NHTSA complaint #10450579, filed 2012-03, 146,000 milesRelated service bulletins
- 11006421Jul 24, 2024GM 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…
- 10249579Jan 12, 2024This PI bulletin advises the technician on the proper way to install the pistons in an engine.
- 10245395Nov 6, 2023This service bulletin provides a vibration analysis worksheet the technician can use in conjunction with the appropriate Vibration Analysis-Road testing procedure when diagnosing…
- 10242843Sep 1, 2023The service bulletin advises the tech of a normal transmission shift condition and the delay in throttle response when the throttle plate is opened rapidly and advises the…
- 10222770Sep 16, 2022This service bulletin provides information on OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification.
- 10220319Sep 1, 2022This diagnostic tip advises the tech not to separate the flexplate from the torque convertor or damage my occur if the engine is started while diagnosing for noise from the…
- 10201098Dec 1, 2015OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification
- 10190503Dec 1, 2015OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification
- 10012696Feb 1, 2004Diagnostic trouble code (dtc) c0379 set, service 4wd light on, 4wd inoperative.
Transmission and drivetrain: other model years
Other parts of the 2004 Chevrolet Trailblazer EXT
145 complaintsFuel system
46 complaintsEngine cooling
16 complaintsExterior lighting
13 complaintsEquipment
9 complaintsVehicle speed control
9 complaintsSteering
8 complaintsVisibility (wipers, defrost, mirrors)
8 complaintsAir bags
7 complaintsBody and structure
7 complaintsEngine
5 complaintsLatches, locks and linkages
3 complaints
← All problems reported for the 2004 Chevrolet Trailblazer EXT
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology