2003 Chevrolet Trailblazer EXT Other or unknown Problems
- Complaints
- 7about this part
- Share
- 2%of 313 total for the year
- Median mileage
- 106,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 7 complaints about the other or unknown of the 2003 Chevrolet Trailblazer EXT, 2% of the 313 complaints for this model year. Where a mileage was given, the median is 106,000 miles. 1 of these say a crash was involved, 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.
“Purchased a 2003 chevy trailblazer-ext lt in dec 2002 from the dealer, team Chevrolet in pasadena. Since purchasing the vehicle, there's been several recalls, one in particular that keeps recurring are the brake lights keep burning, the dealer changed both units but it keeps burning out. I got tired of taking it to the dealer, so I purchased new bulbs and looked into replacing them myself. …”
NHTSA complaint #10315703, filed 2010-03, 89,500 miles“My speedometer in my 2003 Chevrolet trailblazer stopped working, all the other instruments work. This is not safe. I did some research and found that a number of complaints have been filed on this very issue. Gm should replace this part. It appears they knew there was a problem.”
NHTSA complaint #10254680, filed 2009-01, 106,000 miles“I was at work on 8-18-2011 when co workers asked me if I had a black chevy trailblazer because someone saw my rear window explode. I went outside and there was glass all over the ground outside and my window was broken in little pieces. I came home and searched the web for similar problems. I found this had happened to other people and there was a number to contact the manufacturer. I called them but they told me there aren't any open recalls pertaining to this type of problem.”
NHTSA complaint #10420048, filed 2011-08, 130,000 miles“While changing lanes on the freeway, my tailgate window shattered on my 2003 chevy Trailblazer Ext. There were no warning signs of this event. There were no chips in the glass, the road was smooth. Since the glass has shattered the tailgate lock mechanism is now malfunctioning as well.”
NHTSA complaint #10399409, filed 2011-05“It takes 3 times longer for the rear heating system to blow warm air then the system in the front. I have taken it to the dealer 3 times and still have the same problem. The last time I was told that engineering was notified of the situation.”
NHTSA complaint #10150772, filed 2006-02Related service bulletins
- 11020816Jul 18, 2025This PI communicates the requirement to provide a pico file to receive diagnostic assistance from TAC.
- 11007208Sep 6, 2024This Preliminary Information communication provides information to the technician about changing the tire and wheel size on vehicles. General Motors will only support a tire…
- 11004557Jun 17, 2024This bulletin provides information for use on a Product Assistance Claim (PAC), which is formerly known as a Product Allegation Resolution (PAR) claim.
- 11000576May 7, 2024This Warranty Administration bulletin provides retail and wholesale service personnel with the policies/procedures and the warranty transaction submission procedures that support…
- 10079728Jan 15, 201614423c - special coverage (revised service procedure). A fuel tank inlet check valve (icv) could fracture. The icv is located above the full fuel level. A fractured icv could…
- 10079705Jan 12, 201614423b - special coverage (revised part information and service procedure). A fuel tank inlet check valve (icv) could fracture. The icv is located above the full fuel level. A…
- 10201115Dec 1, 2015OnStar Voice Fallback Number Update
Other or unknown: other model years
Other parts of the 2003 Chevrolet Trailblazer EXT
89 complaintsElectrical system
77 complaintsTransmission and drivetrain
49 complaintsVisibility (wipers, defrost, mirrors)
26 complaintsExterior lighting
23 complaintsBody and structure
20 complaintsEngine cooling
16 complaintsBrakes
13 complaintsLatches, locks and linkages
13 complaintsSuspension
12 complaintsVehicle speed control
7 complaintsSteering
6 complaints
← All problems reported for the 2003 Chevrolet Trailblazer EXT
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 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