Huge win for car owners! All TSBs to be made public. The Center for Auto Safety just made the NHTSA (US Government) make public the full text of all TSBs from now on. They are the same organization that has petitioned the NHTSA & filed lawsuits to protect car owners over exploding gas tanks & other major safety issues. Whenever you drive in your car, you are safer thanks in part to a lot of work over the years by this small but very effective consumer advocacy group.

Please take a moment & say thank you by donating $5 or whatever you can to the Center for Auto Safety.


hardly worth mentioning
Crashes / Fires:
0 / 1
Injuries / Deaths:
0 / 0
Average Mileage:
77,092 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2004 Chevrolet Trailblazer EXT engine problems

engine problem

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2004 Chevrolet Trailblazer EXT Owner Comments

problem #5

Jan 042012

Trailblazer EXT 6-cyl

  • 146,000 miles


Car felt "stuck" in gear, wouldn't accelerate, low on transmission fluid. Added more fluid, replaced speed sensor, camshaft & crankshaft sensors. Still having issues with rpms going high, car slamming from one gear into another. Also cannot run heat while driving, fan draws power & causes engine to stall out. Car also burning through gas very quickly.

- Oakdale, CT, USA

problem #4

Aug 112011

Trailblazer EXT 6-cyl

  • 75,000 miles
This vehicle had been parked in the driveway from 7:45 pm, (August 10, 2011). I was awakened at approx. 3:55 am on 8-10-2011 by hearing a muffled boom. At 4:00 am (Aug. 11, 2011) I heard a loud bang type noise. I immediately got up and went to investigate. I went outside and found my 2004 trailblazer (ext) on fire from the engine bay and just beginning to flame inside the vehicle's passenger compartment at the only took minutes before the vehicle was fully involved. The fire began in the engine bay. The fire marshall report is still pending and I was informed it would take 6 to 8 weeks before it was available. Approx. Two to three months prior, I took the vehicle to a repair garage to fix the low beam headlights (they had failed and changing the bulbs was no help. It turned out that it was a failed relay, which was replaced. It was a couple of weeks later that I had to replace the vehicle's battery as it had gone dead and would not take a charge. The old battery was about three years old. There were no other battery/headlight issues after these repairs. No tools or other parts were dropped into the engine bay, or left in the bay. I was an aircraft mechanic and old habits of keeping rack of my tools never die and all tools used were accounted for. The roads were dry where it was driven there was no rain at the house all night. I reported this to Chevrolet that day. As a result of the fire, the eaves of the house over the garage caught fire, my wife, son and myself had minor carbon monoxide poisoning, my work truck was damaged by the heat of the fire, so I cannot work (self employed) until I get a replacement (no rental company will let me use a truck to work from as I need to carry large quantities of chlorine in my pressure cleaning business. There have been no other problems of this kind before with this vehicle.

- Florida, FL, USA

problem #3

Nov 112010

Trailblazer EXT

  • 98,000 miles
Not sure what to file this under, so I put it under unknown and other. About 4 months ago my service engine soon light came on. It stayed on for a few days then went off, a few days later it was back on, then a few days later went off, then it came on for a longer period of time and do the same thing, eventually it stayed on. Took it to the Chevy dealership where I bought it and they said the gas tank had a crack in it and needed to be replaced. Said it was probably from the gas nozzle hitting the tank when filling it up. Don't see how that is possible, when it is only me or my husband filling it up & how hard would you have to hit it for it to crack? had it replaced the next month. Now the service engine soon light is doing the same thing. Haven't taken it back in yet.

- Liberty Hill, TX, USA

problem #2

Mar 092009

Trailblazer EXT

  • 65,459 miles
2004 trailblazer, transmission dipstick rusted and broke, transmission went out from water getting inside / do not know how this could have happened ! and the bearings in the waterpump went out leaving the fan shaft wiggling / loose. With only 65000 miles on my trailblazer not traveling no faster than 75 mph max. This should not have happened. My friends with the same trailblazer is having the same thing happening. I serviced every 3500 miles since owned 2005. Please help if can.

- Lawrenceburg, IN, USA

problem #1

Jul 302006

Trailblazer EXT 4-cyl

  • Automatic transmission
  • 1,000 miles
2004 Chevy trailblazer. Intermittent engine stalling since new. Many service visits to Chevy dealers to fix, however mechanics stumped. Local gas station mechanic found the problem having to do with components in the emission control / vapor recovery system. Now Chevy needs to figure out the cure. In the meantime I get to drive around with the "check engine" light on. I guess this is better than being crashed because my car stalled in an intersection or on the highway. Chevy mechanics and engineers need to get the "duh" award. Very bad customer service and diagnostics performed by Chevy. I would still like to have the check engine light to go off, and have the engine not stall if that is possible. Please send info to have this done if possible.

- Farmingdale, NY, USA

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