2004 Chevrolet Trailblazer EXT Engine Problems
- Complaints
- 5about this part
- Share
- 2%of 261 total for the year
- Median mileage
- 131,129miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 5 complaints about the engine of the 2004 Chevrolet Trailblazer EXT, 2% of the 261 complaints for this model year. Where a mileage was given, the median is 131,129 miles. 1 a fire, according to the filers.
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.
“While driving on the highway there was a boom under the hood. Two minutes later the car started decreasing power and I had to pull over. Before I could get out to lift the hood, fire was shooting from under neath.”
NHTSA complaint #10557978, filed 2013-12, 119,258 miles“Starting about a few weeks ago my 2004 chevy Trailblazer Ext has reeked of unspent gasoline, and this smell consumes the entire interior and exterior of the vehicle. The vehicle also has small leak below reservoir which appears to be leaking unspent fuel. Chevy offered a special coverage to correct this issue (corrosion on top of fuel tank reservoir), however it only covers vehicles under 10 years of age and under 120k miles. My vehicle is under that mileage, however this repair will not be covered due to age of vehicle (mine was assembled in march). …”
NHTSA complaint #10628406, filed 2014-08, 111,000 miles“Vehicle's reduced engine power light comes on, and vehicle loses power in dangerous places. Lost of problems consist of several parts having to do with acceleration. This problem happened suddenly, andnis a danger to himan safety because of it happening several times including o n the highway.”
NHTSA complaint #11000980, filed 2017-06, 162,525 miles“I was wondering how come there hasn't been a recall for the chevy Trailblazer Ext for the throttle body. I see that they have recalls on other chevy cars with the same issue. This is a very dangerous issue as when this goes you have a reduce engine light that comes on. Which I didn't know what that meant until my car wasn't going any more than 20 MPH. This is very dangerous to be on the road like I was and can't speed up or better yet trying to turn when you don't have the power to do so. Also, I see that there were also alot of issues with the speedometer. …”
NHTSA complaint #10457180, filed 2012-05Related service bulletins
- 11004761Jun 28, 2024This service bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank or…
- 10211658May 2, 2022This service bulletin provides policy information on warranty administration guidelines for multiple repairs with independent causes (GM Canada Dealers Only).
- 10082869Aug 29, 2016This informational bulletin provides additional information on how to install pistons and suggest what tools to use.
- 10082814Aug 2, 2016This informational bulletin provides information to gm dealers on the correct cleaning methods when cleaning engine gasket sealing surfaces.
- 10201098Dec 1, 2015OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification
- 10190503Dec 1, 2015OEM and Remanufactured Engine and Automatic Transmission/Transaxle Identification
Engine: other model years
Other parts of the 2004 Chevrolet Trailblazer EXT
145 complaintsFuel system
46 complaintsTransmission and drivetrain
17 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 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 28, 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