2005 Chevrolet Trailblazer EXT 370 Transmission and drivetrain Problems
- Complaints
- 5about this part
- Share
- 2%of 237 total for the year
- Median mileage
- 70,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 5 complaints about the transmission and drivetrain of the 2005 Chevrolet Trailblazer EXT 370, 2% of the 237 complaints for this model year. Where a mileage was given, the median is 70,000 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“On july 29, 2015 I exited the freeway, and suddenly my 2005 chevy trailblazer ext 4.2l began to stall and would not proceed upon acceleration. After calling the GM corporate office, I asked if there was a possible warranty on the vehicles transmission, they stated no ... However, the representative did tell me that my used 2005 trailblazer ext did have the transmission replaced in 2007. This is 2 years after the vehicle hit the road spanking brand new. There has to be a problem with the chevy trailblazers transmission. I ended up spending a total of $1,600.00 for a rebuilt transmission. …”
NHTSA complaint #10747094, filed 2015-08, 223,000 miles“I bought a 05 tb-ext last june, I no sooner got 5 miles down the highway (8 mile total on od) when I started to feel something funny, I was pushing on the gas, but it was loosing speed traffic was backing up behind me as I pulled off the road. I had it towed to back to the dealership where I was assured that it was a tranny line that was not properly secured at the factory. Now 3 months later, (5300 total on od) my kids and I were driving on the freeway yesterday at 65 MPH when the RPM's shot up to 4500-5000, and it was loosing speed. There was not any warning signs going off. …”
NHTSA complaint #10134675, filed 2005-08, 5,300 miles“Steering wheel malfunctions, car turns off when wheel is extended too far to the left. Seatbelts for last row of seats don't lock, radio is stuck, buttons don't control radio properly.”
NHTSA complaint #10663304, filed 2014-12, 125,000 miles“Brand new 2005 Chevrolet trailblazer transmission wont downshift back into low gear upon coming to a stop. Dealer said they fixed the problem the first time it happened (at 600 miles) by replacing a sensor. It has just now started happening again (at 2,100 miles).”
NHTSA complaint #10140521, filed 2005-10, 2,100 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…
- 11001321May 16, 2024This bulletin provides information on the harmful effects of water or ethylene glycol in transmission fluid.
- 10250347Feb 2, 2024This 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…
- 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…
- 10234619Apr 6, 2023This bulletin provides information on the harmful effects of water or ethylene glycol in transmission fluid.
- 10228863Dec 13, 2022This 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…
- 10227241Nov 18, 2022This bulletin provides information on Policies Applicable to All U.S. Dealers for Engine and Transmission Assembly Replacement Under Warranty, Policy or Customer Enthusiasm and…
- 10222770Sep 16, 2022This service bulletin provides information on OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification.
Transmission and drivetrain: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2005 | 5 | 2% |
| 2002 | 1 | 17% |
Other parts of the 2005 Chevrolet Trailblazer EXT 370
101 complaintsFuel system
94 complaintsExterior lighting
15 complaintsVisibility (wipers, defrost, mirrors)
12 complaintsEngine cooling
10 complaintsVehicle speed control
8 complaintsAir bags
7 complaintsBody and structure
6 complaintsTires
5 complaintsEngine
4 complaintsEquipment
4 complaintsLatches, locks and linkages
4 complaints
← All problems reported for the 2005 Chevrolet Trailblazer EXT 370
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