2003 Chevrolet Trailblazer EXT Electrical system Problems
- Complaints
- 77about this part
- Share
- 25%of 313 total for the year
- Median mileage
- 84,225miles
- Trend
- StableComplaints filed in the last 3 full calendar years are within 25% of the 3 years before.
NHTSA recorded 77 complaints about the electrical system of the 2003 Chevrolet Trailblazer EXT, 25% of the 313 complaints for this model year. Where a mileage was given, the median is 84,225 miles. 2 of these say a crash was involved and 4 a fire, according to the filers.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“The electronic throttle module to PCM communication error comes up and the vehicle starts the warm up process and then dies in the process of warm up procedures. I guess my question to you is how can I fix this or does a deal need to fix it or is there a recall on this issue?”
NHTSA complaint #11019931, filed 2017-08, 199,263 miles“Like many other, my problem is with the instrument panel/cluster. My fuel gauge doesn't work and my speedometer is all over the place...sometimes it seems to work fine, other times not at all, and sometimes it works but isn't accurate.”
NHTSA complaint #10520572, filed 2013-06, 125,000 miles“My vehicle started randomly shutting off while driving. Loss of power to everything but the brakes. Luckily I was only going 10-15mph each time this happened. With the recent recall in GM vehicles regarding the ignition switch I thought it would be a good idea to switch this part out first. Fixed the problem immediately. I would like to be reimbursed my cost for part and labor. I can't believe as many known problems the trailblazer has with this that it has yet to be added to the recall list.”
NHTSA complaint #10616831, filed 2014-07, 131,000 miles“My 2003 trailblazer has a speedometer and tachometer that quit working most of the time. I contacted a GM dealer and was informed it would cost about $500 to repair. My cars inspections runs out soon and cant be inspected till this issue is repaired.”
NHTSA complaint #10376909, filed 2011-01, 62,000 miles“I started my vehicle and the instrument cluster did not work. No precheck lights except check engine light came on and none of the instruments on the panel would work. Tried shutting down the engine and restarting but to no avail.”
NHTSA complaint #10451396, filed 2012-03, 141,000 milesRelated service bulletins
- 11006621Aug 26, 2024Vehicle Wide Programming (VWP) is a new process to update software on GM Vehicles. It provides the ability via a single selection within Techline Connect to first identify which…
- 11002312Jun 6, 2024This service bulletin provides information for dealers/technicians on Service Programming System (SPS) Error Codes E4398, E4399, E4401, E4403, M4404, M4413, M6954, M6955, E4414…
- 10252735Mar 28, 2024This bulletin provides information for electrical ground repairs using new General Motors replacement fasteners with conductive finish.
- 10244214Sep 21, 2023This informational bulletin provides information for the IPC odometer programming method quick reference guide.
- 10225615Oct 19, 2022This service bulletin provides information on Module Harvesting.
- 10168969Nov 20, 2019This Preliminary information communicates information for setting up the SDM.
- 10190320Oct 1, 2017IPC Odometer Programming Method Quick Reference Guide
- 10083898Apr 27, 2016This preliminary information communication advises the technician if unable to place an onstar call in the ignition on mode after the onstar canada upgrade, to contact the gm…
- 10083484Apr 19, 2016This preliminary information communication provides information to help the dealership technicians perform a parasitic drain test for the onstar module. When performing battery…
- 10078735Apr 19, 2016This preliminary information communication provides information to help the dealership technicians perform a parasitic drain test for the onstar module. When performing battery…
Electrical system: other model years
Other parts of the 2003 Chevrolet Trailblazer EXT
89 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 complaintsOther or unknown
7 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 29, 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