Total Complaints
19 filings
CHEVROLET TRAILBLAZER EXT 370 · model year
19 NHTSA complaints for this specific cohort.
NHTSA overall rating
Not crash-tested
New Car Assessment Program
The 2003CHEVROLETTRAILBLAZER EXT 370 carries 19 consumer safety complaints in NHTSA's Office of Defects Investigation database for this specific model-year cohort. Within that volume, owners reported 0 crashes, 0 fires, 0 injuries, and 0 fatalities. No NCAP 5-star crash-test rating is available for this model year in the federal database.
Component-level analysis is where model-year complaints become actionable: the top complaint category for the 2003 TRAILBLAZER EXT 370 is electrical system with 6 filings, followed by fuel/propulsion system (3) and exterior lighting (2). Concentration in one or two component groups is the classic signature of a systemic defect; a flat distribution usually reflects normal aging, warranty complaints, or isolated build-plant variability.
NHTSA currently has 57 investigation files overlapping the 2003 TRAILBLAZER EXT 370, and 2 remain open. Owners comparing this cohort against neighboring years should pair the counters above with the complaint-by-year trend on the parent model page — a spike in a single year often tracks to a platform refresh, a new transmission supplier, or an updated ECU calibration. Use the related-complaint feed below to read raw owner narratives before deciding whether any pattern here affects your specific use case.
Total Complaints
19 filings
Crashes Reported
0 reports
Source
NHTSA ODI
Federal complaints database
At or below the fleet median complaint volume.
| Component | Count |
|---|---|
| ELECTRICAL SYSTEM | 6 |
| FUEL/PROPULSION SYSTEM | 3 |
| EXTERIOR LIGHTING | 2 |
| ENGINE AND ENGINE COOLING | 1 |
| ELECTRONIC STABILITY CONTROL (ESC) | 1 |
| VISIBILITY | 1 |
| TIRES | 1 |
| WHEELS | 1 |
| ENGINE | 1 |
| STRUCTURE:BODY:HATCHBACK/LIFTGATE | 1 |
| VISIBILITY/WIPER | 1 |
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. IT IS ABSOLUTELY RIDICULOUS THAT THIS IS NOT AN OFFICIAL RECALL AND THAT CHEVY HAS LOOPHOLED NUMEROUS OWNERS OUT OF THE COVERAGE BY NOT INCREASING THE MILEAGE REQUIREMENT. THE NATIONAL AVERAGE TO DRIVE A CAR ACCORDING TO THE NHTSA IS BETWEEN 15,000 AND 16,000 PER YEAR. ACCORDING TO THEIR MILEAGE REQUIRES A PERSON WOULD HAVE HAD TO DRIVE THIS CAR LESS THAT 10,000 PER YEAR. THIS IS TOTALLY UNREALISTIC. SINCE THIS
Mileage: 153,000
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 . *JS
Mileage: 70,000
TL* 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.
Mileage: 21,000
TL* 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.
Mileage: 150,000
MY WIFE WAS DRIVING THE SUV AT HIGHWAY SPEED WHEN THE FRONT WINDSHIELD WIPERS CEASED TO FUNCTION DURING A HEAVY THUNDERSTORM. SHE HAD TO PULL OVER BECAUSE HER VISIBILITY WAS OBSTRUCTED TO THE POINT OF NOT BEING ABLE TO OPERATE THE VEHICLE SAFELY.
Mileage: 87,000
TL* THE CONTACT OWNS A 2003 CHEVROLET TRAILBLAZER EXT 370. WHILE DRIVING VARIOUS SPEEDS, THE HATCH DOOR AJAR LIGHT ILLUMINATED AND FAILED TO LATCH WITHOUT WARNING. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 100,000.
Mileage: 100,000
VEHICLE STARTED LEAVING SPOTS OF OIL ON THE GROUND OVER NIGHT. WAS DRIVING TO WORK ON WEDNESDAY AND A BLUISH CLOUD OF SMOKE WAS TRAILING BEHIND ME. ARRIVED AT WORK AND LET TRUCK COOL DOWN AFTER WHICH I CRAWLED UNDERNEATH AND WITH A MIRROR WAS ABLE TO LOCATE THE LEAKING REAR MAIN SEAL. THIS IS A COMMON PROBLEM WITH GM,S 5.3 LITER ENGINES. MULTIPLE FORUMS ARE POSTING MANY PEOPLE COMPLAINING OF THE SAME ISSUE. GM NEEDS TO STAND BEHIND THERE PRODUCTS AND REPAIR THIS ISSUE WHICH AGAIN IS A WIDE SPREAD KNOWN PROBLEM. *TR
Mileage: 109,654
AFTER A LONG DAY OF WORK, I RETURNED TO MY PARKED VEHICLE TO DISCOVER A TOTALLY FLAT FRONT RIGHT TIRE, ON CLOSER EXAMINATION IT WAS NOTED THAT THE TIRE HAD SPLIT ON THE OUTSIDE SEAM. IT WAS NOTED THAT THE SAME CONDITION OF THE TIRE SPLITTING WAS VISIBLE ON ALL THREE OF THE OTHER TIRES ON THE VEHICLE. FLAT TIRE WAS REPLACED WITH SPARE TIRE THAT HAD NEVER BEEN USED. I RETURNED THE VEHICLE TO THE PLACE THAT I HAD PURCHASED THE TIRES; THE TECH AT THE STORE EXAMINED THE TIRES AND DECLARED THAT ALL FOUR TIRES WERE MANUFACTURED FROM THE SAME BATCH OF TIRES MANUFACTURED BY GOODYEAR. AND THAT ALL FOUR WERE DEFECTED. TODAY I CONTACTED GOODYEAR AND TOOK MY VEHICLE TO THEIR LOCATION. THE MAN AT GOODYEAR STATED THAT GOODYEAR HAS NEVER HAD A RECALL NOR DEFECTIVE TIRES. THAT HE WOULD HAVE TO CONTACT GOODYEAR WHEN THEY OPENED ON THE EAST COAST. MY COMPLAINT IS WITH GOODYEAR. AND THE VALIDITY OF THE GOODYEAR TECH STATING THAT GOODYEAR HAS NEVER HAD A DEFECTIVE TIRE OR RECALL ON THEIR TIRES. *TR
Mileage: 169,141
AFTER A LONG DAY OF WORK, I RETURNED TO MY PARKED VEHICLE TO DISCOVER A TOTALLY FLAT FRONT RIGHT TIRE, ON CLOSER EXAMINATION IT WAS NOTED THAT THE TIRE HAD SPLIT ON THE OUTSIDE SEAM. IT WAS NOTED THAT THE SAME CONDITION OF THE TIRE SPLITTING WAS VISIBLE ON ALL THREE OF THE OTHER TIRES ON THE VEHICLE. FLAT TIRE WAS REPLACED WITH SPARE TIRE THAT HAD NEVER BEEN USED. I RETURNED THE VEHICLE TO THE PLACE THAT I HAD PURCHASED THE TIRES; THE TECH AT THE STORE EXAMINED THE TIRES AND DECLARED THAT ALL FOUR TIRES WERE MANUFACTURED FROM THE SAME BATCH OF TIRES MANUFACTURED BY GOODYEAR. AND THAT ALL FOUR WERE DEFECTED. TODAY I CONTACTED GOODYEAR AND TOOK MY VEHICLE TO THEIR LOCATION. THE MAN AT GOODYEAR STATED THAT GOODYEAR HAS NEVER HAD A RECALL NOR DEFECTIVE TIRES. THAT HE WOULD HAVE TO CONTACT GOODYEAR WHEN THEY OPENED ON THE EAST COAST. MY COMPLAINT IS WITH GOODYEAR. AND THE VALIDITY OF THE GOODYEAR TECH STATING THAT GOODYEAR HAS NEVER HAD A DEFECTIVE TIRE OR RECALL ON THEIR TIRES. *TR
Mileage: 169,141
TL*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.
Mileage: 140,000
TL*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.
Mileage: 140,000
TL* 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.
Mileage: 150,000
TL* 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.
Mileage: 150,000
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. *TR
Mileage: 160,000
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 $$$$$$ WHY CAN'T SOME ONE FINE OUT DO A RECALL WE HATE DRIVING ON OUR HIGHBEAM AND SO DOES THE PEOPLE WE PASS OR GET BEHIND. WE DO TRY AND TURN THEM OFF WHEN WE PASS OTHER BUT THAT IS DANGERS AS WELL.PLEASE HELP WE WANT TO KEEP OUR TRAILBLAZER AND STAY ALIVE. *TR
THIS HAS BEEN GOING ON FOR THREE YEARS SINCE 2011 AT NIGHT AT RANDOM TIMES OUR LOW BEAM HEADLIGHTS GO OUT ON US AS YOUR DRIVING DOWN THE HIGHWAY. THEY MAY COME BACK ON BEFORE YOU GET HOME BUT WE HAVE DROVE 1HR 30 MINUTES AND STILL NOT. WE DID TAKE IT IN SEVERAL TIMES AND THEY CAN NOT FINE A PROBLEM. THEY SAID THEY CAN CHANGE THIS N THAT SENOR BUT COULDN'T SAY THAT WOULD EVEN FIX IT. BUT COST US $$$$$$ WHY CAN'T SOME ONE FINE OUT DO A RECALL WE HATE DRIVING ON OUR HIGHBEAM AND SO DOES THE PEOPLE WE PASS OR GET BEHIND. WE DO TRY AND TURN THEM OFF WHEN WE PASS OTHER BUT THAT IS DANGERS AS WELL.PLEASE HELP WE WANT TO KEEP OUR TRAILBLAZER AND STAY ALIVE. *TR
THIS HAS BEEN GOING ON FOR THREE YEARS SINCE 2011 AT NIGHT AT RANDOM TIMES OUR LOW BEAM HEADLIGHTS GO OUT ON US AS YOUR DRIVING DOWN THE HIGHWAY. THEY MAY COME BACK ON BEFORE YOU GET HOME BUT WE HAVE DROVE 1HR 30 MINUTES AND STILL NOT. WE DID TAKE IT IN SEVERAL TIMES AND THEY CAN NOT FINE A PROBLEM. THEY SAID THEY CAN CHANGE THIS N THAT SENOR BUT COULDN'T SAY THAT WOULD EVEN FIX IT. BUT COST US $$$$$$ 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. WE DO TRY AND TURN THEM OFF WHEN WE PASS OTHER BUT THAT IS DANGERS AS WELL.PLEASE HELP WE WANT TO KEEP OUR TRAILBLAZER AND STAY ALIVE. *TR
SPEEDOMETER TACHOMETER AND BATTERY GAUGE DO NOT WORK. *TR
Mileage: 60,000
EXHAUST BOLTS HAVE BROKEN ON THE EXHAUST MANIFOLD, THIS VEHICLE HAS THE V8 ENGINE. DEALER EXPLAINS THAT THIS NEEDS FIXED AS CARBON MONOXIDE COULD ENTER THE PASSENGER CABIN. THERE WAS AN ACCIDENT WITH THE VEHICLE A YEAR AGO, I CONTACTED MY INSURANCE COMPANY TO SEE IF IT WAS RELATED TO THE ACCIDENT. THEY CLAIM THAT IT IS NOT RELATED TO THE ACCIDENT AND THAT GM VEHICLES MODEL YEAR 2000 TO 2007 WITH THIS 5.3 V8 ENGINE HAVE REPORTED THESE BOLTS BREAKING AND INFORMED ME TO CONTACT GM ABOUT REIMBURSEMENT FOR REPAIR EXPENSES. I DO NOT HAVE THE $2000 FOR REPAIRS AND AM CONCERNED ABOUT THE SAFETY OF MY FAMILY WHILE IN THE VEHICLE. *TR
Mileage: 157,000
Loss of motive power due to engine failure
Loss of Motive Power due to the Battery Energy Control Module
Electric Vehicle Battery Fires
Outboard Front Seat Belt Anchor Cable Failure
Fuel Line Leak
Data as of 2025. Sources: NHTSA Office of Defects Investigation (ODI) complaints database, NHTSA recall campaign API, NHTSA NCAP crash-test ratings, and NHTSA FARS for fatality cross-reference.
Read our methodology — how this data is sourced, computed, and verified.