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Fuel systemPart report

2003 Chevrolet Trailblazer EXT Fuel system Problems

Complaints
89about this part
Share
28%of 313 total for the year
Median mileage
73,037miles
Trend
StableComplaints filed in the last 3 full calendar years are within 25% of the 3 years before.

NHTSA recorded 89 complaints about the fuel system of the 2003 Chevrolet Trailblazer EXT, 28% of the 313 complaints for this model year. Where a mileage was given, the median is 73,037 miles.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“I own a 2003 chevy trailblazer xlt, when I fill the tank up and park on a hill the tank leaks gas out from the top of the tank or the top of the cup that connects to and goes into the tank. I have a steep driveway and now I notice that I leak gas when I am on a full tank and parked on a steep hill...I have 3 boys ranging from 2, 4 and 14 and they all smelled and saw the gas.”

NHTSA complaint #10324973, filed 2010-04, 130,000 miles

“I have a 2003 chevy Trailblazer Ext, which also has a leak in the plastic gas tank. It was detected in the garage by the strong odor. I was told by the mechanic today that this is not uncommon for this model. The plastic break is where the neck is molded into the tank. Very dangerous situation, considering many homes, as ours, has the water heater in the garage.”

NHTSA complaint #10177153, filed 2006-12, 19,300 miles

“I filled my gas tank on my 2003 chevy Trailblazer Ext. And got a gas smell, shortly after the check engine light came on. There is a leak in the fill and fuel pump area I guess. I was referred to see if there were any recalls for this defect and came across this. The garage did a temp. Repair with silicon that only lasted 3 weeks. Now the same thing is happening. I would have to change the entire gas tank to fix this issue.”

NHTSA complaint #10236462, filed 2008-07, 82,000 miles

“I have intermittent smell of fuel coming from vehicle; consistently declining mpg; ses light coming on; taken it to the dealership after having received a letter stating that there was a fuel tank or pump issue; they diagnosed that the filler neck was cracked a nd leaking but stated that it wasn't part of the repairs from the letter and said it would cost a $1000 to replace my fuel tnk and then they would replace the fuel pump module for free.”

NHTSA complaint #10263953, filed 2009-04, 99,000 miles

“Began to smell fuel from the rear of my 2003 Trailblazer Ext. I had received a letter from GM stating the filler neck some times cracks and would be fixed without cost. I took the vehicle to my dealer, they dropped the tank and said the fuel module was corroded and they would replace the tank but want 625.00 dollars to replace the fuel module. And will not release my vehicle. I told them to put it back the way it was and they said they can't.”

NHTSA complaint #10231362, filed 2008-06, 57,000 miles

Related service bulletins

Fuel system: other model years

YearComplaintsShare of year
200612968%
20044618%
20038928%
20022323%

Other parts of the 2003 Chevrolet Trailblazer EXT

Electrical 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 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 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