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. Notes: It would be ill-advised to blaze any trails with the 2004 Trailblazer. Its faulty fuel gauge could leave you stranded.


pretty bad
Typical Repair Cost:
Average Mileage:
131,625 miles
Total Complaints:
4 complaints

Most Common Solutions:

  1. not sure (2 reports)
  2. replace ignition coil (2 reports)
2004 Chevrolet Trailblazer engine problems

engine problem

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2004 Chevrolet Trailblazer Owner Comments

problem #4

Mar 192016


  • Automatic transmission
  • 151,000 miles


Car was idling hard, and sounded like it was loping at low RPMs. This had been happening for a couple months so I didn't think too much about it. Suddenly the car's check engine light started flashing. I drove to car to Autozone and had them check the check engine light. They said it was either water cylinder 1, or the ignition coil was bad. I bought a new coil and replaced the spark plug. Check engine light went off, and the car has been running smoothly since. Coil was $68, and the fix took about an hour.

- , Shreveport, USA

problem #3

Jun 092015

Trailblazer LS 4.2L

  • Automatic transmission
  • 255,500 miles

Not really a complaint. I had to fix it and I did. Easy to fix with a youtube video. I had P0305 code and took a chance on the problem.

- , Portsmouth, VA, USA

problem #2

Apr 132004

Trailblazer LS

  • Automatic transmission
  • 100,000 miles

Since the day I drove it off of the lot the check engine light will come on and off. It will not stay on long enough to register a code so I have been told numerous times from the dealer! Piece of crap car!

- , Mentor, OH, USA

problem #1

Dec 052005

Trailblazer LS 4.2L

  • Automatic transmission
  • 20,000 miles

The engine light would flash on/off very quickly. Chevy would tell me: 1) nothing is wrong or 2) some ridiculously expensive fix. TURNS OUT NOTHING EVER FIXED IT. It's still flashing on/off.

- , Phoenix, AZ, USA

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