2003 Chevrolet Trailblazer Ext problems, complaints & recalls
Most-reported problem areas: Electrical System (37) · Fuel System, Gasoline (33) · Power Train:automatic Transmission (25)
🧭 Reliability snapshot
Compared against other Chevrolet Trailblazer Ext model years — complaint volume vs the model's median year, recalls and severity. How we score →
🛣️ Complaints by mileage
260 NHTSA complaints that reported an odometer reading.
Safety recalls (0)
No recalls on record for this model year (campaigns announced since 2010).
Service bulletins (117)
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 117 bulletins. Search all of them free at nhtsa.gov.
What owners report
2019-03-20 · Fuel/Propulsion System“tl* the contact owns a 2003 chevrolet trailblazer ext. the contact stated that fuel was leaking near the bottom rear of the vehicle. the contact inspected underneath the vehicle and noticed that the check valve was fractured. joe lunghamer chevrolet (475 summit dr, waterford twp, mi 48328, 1-(248) 683-7100) was notified and stated that the vehicle …”
2018-12-04 · Visibility/Wiper · 120,600 mi“the abs light has come on and then it would work sometimes and not other times. now it never works. now that its winter i'm sliding at stop signs that aren't even that slippery. the actuators in the heating and cooling are not working properly. all summer i had heat blowing all the time and suddenly there would be nothing. now it's cold air all …”
2018-10-11 · Fuel/Propulsion System · 194,000 mi“has a bad gas smell leaking gas somewhere…”
2018-05-30 · Electrical System · 177,000 mi · 🔥 fire“one by one things have been going out and not working. first the car would not start all the time with the key, then the a/c stoped working, next was the fuel pump, then the injectors. i checked everything it could be. i was driving with my kids down the highway when my car just died lost power steering so it was hard to get off the road fast. i go…”
2018-02-23 · Vehicle Speed Control · 140,443 mi“when driving for 30 to 45 mins all the instruments on dash start sticking and reading wrong information. in the picture my car is parked .…”
2017-10-13 · Electrical System · 108,321 mi“speedometer is erratic often showing false speed or goes to zero.all moving speeds highway or streets.…”
2017-08-27 · Electrical System · 199,263 mi“the electronic throttle module to pcm communication error comes up and the vehicle starts the warm up process and then dies in the process of warm up procedures. i guess my question to you is how can i fix this or does a deal need to fix it or is there a recall on this issue?…”
2017-07-24 · Power Train · 150,000 mi“driving down road on the way to hospital and trailblazer made a loud clunk. then started making a whirring noise. finished driving slowly to hospital as not to mess anything else up. pulled in and parked. got ready to leave hospital and had no reverse only foward.…”
2017-05-01 · Power Train · 80,000 mi“my key will not come out of the ignition i had to unscrew and remove the bottom of my steering to push the button also all of my instrument gauge do not work including the speedometer and all gauges so i never know my temperature or fuel level, oil pressure they all are not working properly my speedometer only works sometimes. also my engine is run…”
2017-02-25 · Exterior Lighting · 120,000 mi“low beams intermently go off and on ! exhaust manifold is cracked causing a leak ! all dash gauges but fuel gauge dont work !…”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.