2003 Chevrolet Trailblazer Ext 370 problems, complaints & recalls
Most-reported problem areas: Fuel/Propulsion System (3) · Electrical System (3) · Exterior Lighting (2)
🧭 Reliability snapshot
Compared against other Chevrolet Trailblazer Ext 370 model years — complaint volume vs the model's median year, recalls and severity. How we score →
Safety recalls (0)
No recalls on record for this model year (campaigns announced since 2010).
Service bulletins (76)
Technical service bulletins are repair instructions manufacturers send dealers for known issues. Unlike recalls, the fix is not automatically free — but naming the bulletin at the service desk can save diagnosis time and support goodwill repairs.
Unknown Or Other 2025-07-18 · PIP5601C · Service Bulletin/Repair Instructions
this pi communicates the requirement to provide a pico file to receive diagnostic assistance from tac.
Unknown Or Other 2024-09-06 · PIT3271P · Service Bulletin/Repair Instructions
this preliminary information communication provides information to the technician about changing the tire and wheel size on vehicles. general motors will only support a tire calibration for tires that have been sized, tested and designed for the vehicle in question and its applications. technician s
Electrical System 2024-08-26 · General Communication · Service Campaign
vehicle 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 updating affected modules (with some exceptions). the updating of modules is com
Power Train 2024-07-24 · 24-NA-141 · Service Bulletin/Repair Instructions
gm is receiving damaged (cracked or broken) transmission cores returned to the reman facilities. the damage is being caused either in the removal process by the technician, or inadequate packaging or shipping. this bulletin advises the dealers to be more careful not to damage the transmissions durin
Fuel/Propulsion System 2024-06-28 · 16-NA-383 · Service Bulletin/Repair Instructions
this service bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, crank no start, extended crank or misfire, mil with dtcs, and explains how top tier fuels should be used to reduce carbon build-up.
Unknown Or Other 2024-06-17 · 18-NA-099 · Service Bulletin/Repair Instructions
this bulletin provides information for use on a product assistance claim (pac), which is formerly known as a product allegation resolution (par) claim.
Showing the 6 most recent of 76 bulletins. Search all of them free at nhtsa.gov.
What owners report
2016-03-03 · Fuel/Propulsion System · 153,000 mi“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. …”
2015-12-30 · Electrical System · 70,000 mi“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 vaca…”
2015-12-01 · Fuel/Propulsion System · 21,000 mi“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 manufa…”
2015-11-27 · Fuel/Propulsion System · 150,000 mi“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 w…”
2015-08-24 · Visibility/Wiper · 87,000 mi“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. …”
2015-04-15 · Structure:body:hatchback/Liftgate · 100,000 mi“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. …”
2015-04-03 · Engine · 109,654 mi“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 f…”
2015-02-19 · Wheels · 169,141 mi“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…”
2015-01-23 · Visibility · 140,000 mi“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. …”
2015-01-02 · Exterior Lighting · 150,000 mi“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 cau…”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.