2003 Chevrolet Trailblazer electrical system problems
285 owner complaints filed with NHTSA name the electrical system on the 2003 Chevrolet Trailblazer — 32% of all complaints for this model year.
What owners report
“Transmission doesn’t have 3rd or 4th gear. Vehicle was smoking under hood. Found out after buying it it has flood damage. Mechanic said there was water in the transmission when inspected. Vehicle needs catylic converter sensor and vehicle has bad ground wire. Seller didn’t inform me of any of these…”
filed Mar 1, 2023
“Wire harness coating falling apart almost caught my truck on fire got pictures and it triggers the brake light to stay on”
filed Mar 16, 2021
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
This Preliminary Information communicates to the dealer the process for downloading or updating operating software for the Tire Pressure Monitor, Active Fuel Injector tester, multi media tester, PICO Scope, GR8…
PIP4723J · Service Bulletin/Repair Instructions · issued Oct 25, 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 modules need updating and then proceed to…
General Communication · Service Campaign · issued Aug 26, 2024
Electrical System problems in other Trailblazer years
| Year | Reports | Share |
|---|---|---|
| 2025 Trailblazer | 11 | 58% |
| 2024 Trailblazer | 11 | 34% |
| 2023 Trailblazer | 14 | 23% |
| 2022 Trailblazer | 29 | 27% |
| 2021 Trailblazer | 39 | 21% |
| 2009 Trailblazer | 9 | 33% |
| 2008 Trailblazer | 65 | 34% |
| 2007 Trailblazer | 200 | 27% |
| 2006 Trailblazer | 251 | 23% |
| 2005 Trailblazer | 617 | 42% |
| 2004 Trailblazer | 627 | 58% |
| 2002 Trailblazer | 181 | 16% |
Other reported problem areas on the 2003 Chevrolet Trailblazer
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.