Skip to content
Electrical systemPart report

2003 Chevrolet Trailblazer EXT 370 Electrical system Problems

Complaints
6about this part
Share
43%of 14 total for the year
Median mileage
140,000miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 6 complaints about the electrical system of the 2003 Chevrolet Trailblazer EXT 370, 43% of the 14 complaints for this model year. Where a mileage was given, the median is 140,000 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.

“We were driving down the highway when our rear passenger door flew open, and will not stay closed or lock. We had to drive with someone back there holding it shut til we got to a store to ratchet strap it closed. I called chevy when I seen it was part of a recall for the 2005 but they would not look at mine because it was not the same year as the recall and want me to pay out of pocket to fix the problem, and would not tell me k=name of the part to see if I could buy it and fix it ourselves a lot cheaper.”

NHTSA complaint #10652805, filed 2014-11, 160,000 miles

“2003 Chevrolet trailblazer 370 rear passenger side door electrical window control switch would not completely close window . Smelled like electrical wire burning. Had vehicle stop at time and had assistance in removing door interior panel and found electrical window switch completely melted and wire connection burned . Personal vehicle used on vacation, stopped just off highway at time .”

NHTSA complaint #10817099, filed 2015-12, 70,000 miles

“This has been going on for three years since 2011 at night at random times our low beam headlights go out on us as your driving down the highway. They may come back on before you get home but we have drove 1hr 30 minutes and still not. We did take it in several times and they can not fine a problem. They said they can change this n that senor but couldn't say that would even fix it. But cost us $$$$$$ why can't some one fine out do a recall we hate driving on our highbeam and so does the people we pass or get behind. …”

NHTSA complaint #10630361, filed 2014-09

“The contact owns a 2003 Chevrolet TRAILBLAZER EXT 370. The contact stated that the windows failed to roll up or down. Also, the contact mentioned that the heated seat would not turn off. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was 140,000.”

NHTSA complaint #10678582, filed 2015-01, 140,000 miles

“The contact owns a 2003 Chevrolet TRAILBLAZER EXT 370. The contact stated that the turn signals do not function properly and the hazard lights illuminated instead of the turn signals. The contact was able to press the button for the hazard lights when needed, but not the turn signals. The vehicle was not diagnosed. The failure continued and caused the front headlight assembly and the rear headlight assembly to short and dim with no warning. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 150,000.”

NHTSA complaint #10669711, filed 2015-01, 150,000 miles

Related service bulletins

Electrical system: other model years

YearComplaintsShare of year
2006531%
200510143%
2004640%
2003643%
2002233%

Other parts of the 2003 Chevrolet Trailblazer EXT 370

Fuel system
3 complaintsExterior lighting
2 complaintsVisibility (wipers, defrost, mirrors)
2 complaintsElectronic stability control
1 complaintsEngine
1 complaintsEngine cooling
1 complaintsBody and structure
1 complaintsTires
1 complaintsWheels
1 complaints

← All problems reported for the 2003 Chevrolet Trailblazer EXT 370

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 30, 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