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Fuel systemPart report

2003 Chevrolet Trailblazer EXT 370 Fuel system Problems

Complaints
3about this part
Share
21%of 14 total for the year
Median mileage
150,000miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 3 complaints about the fuel system of the 2003 Chevrolet Trailblazer EXT 370, 21% of the 14 complaints for this model year. Where a mileage was given, the median is 150,000 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.

“There is a known problem with the gas tanks on these vehicles. The vapors cause the check engine light to illuminate. In nys this car will not pass the yearly inspection. Chevrolet has an extended coverage bulletin out but it only is for vehicles that have les than 150,000 miles on it or are not older than 15 years old. Whichever come first. Prior to this, their extended coverage was for 150,000 miles or 12 years. I was excluded from the first time due to age of the vehicle when I purchased it and am now excluded from the second extended coverage due to the mileage. …”

NHTSA complaint #10839742, filed 2016-03, 153,000 miles

“The contact owns a 2003 Chevrolet TRAILBLAZER EXT 370. While driving at various speeds, there was an abnormal odor of fuel coming from the vehicle. The failure recurred continuously. The contact observed fuel dripping from the rear driver side of the vehicle. The vehicle was taken to the dealer where it was not diagnosed or repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 21,000.”

NHTSA complaint #10807665, filed 2015-12, 21,000 miles

“The contact owns a 2003 Chevrolet TRAILBLAZER EXT 370. The contact stated that while driving at various speeds, the vehicle surged forward and the rpms fluctuated without warning. In addition, the contact stated that an abnormal fuel odor emitted from the vehicle as the check fuel warning light illuminated. The vehicle was taken to the dealer where it was diagnosed that the fuel tank vacuum and fuel tank needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 150,000.”

NHTSA complaint #10807225, filed 2015-11, 150,000 miles

Related service bulletins

Fuel system: other model years

YearComplaintsShare of year
2006319%
20059440%
2004640%
2003321%
2002117%

Other parts of the 2003 Chevrolet Trailblazer EXT 370

Electrical system
6 complaints
Exterior lighting
2 complaints
Visibility (wipers, defrost, mirrors)
2 complaints
Electronic stability control
1 complaints
Engine
1 complaints
Engine cooling
1 complaints
Body and structure
1 complaints
Tires
1 complaints
Wheels
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 31, 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