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.


definitely annoying
Crashes / Fires:
0 / 3
Injuries / Deaths:
0 / 0
Average Mileage:
29,939 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 engine problems

engine problem

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2004 Chevrolet Trailblazer Owner Comments (Page 2 of 2)

« Read the previous 20 complaints

problem #4

Jun 202004

Trailblazer 6-cyl

  • Automatic transmission
  • 300 miles


On the 1-2 and 2-3 shifts there is a rattling sound (or light knocking) sound coming from the engine. It sounds like noisy lifters. It occurs most of the time, but not all of the time.

- Tacoma, WA, USA

problem #3

Apr 212004

Trailblazer 6-cyl

  • Automatic transmission
  • 3,651 miles
Engine stalled in traffic and idles rough on startup. Dealer reprogrammed idle control module. Engine surges and shakes under a load from power steering or alterantor. Dealer cleaned throttle body (only 4800 miles) and found large leak at evap vapor pipe. Continued to have problem. Dealership contact GM for help. GM replied that "4.2 liter motors have an inherent vibration at that speed." GM technical assistance also stated "engine surge under is normal under load by design." Car is ticking time bomb for another stall in traffic and daily endangers my family.

- Arlington, TX, USA

problem #2

Jul 122004

Trailblazer 4WD 6-cyl

  • Automatic transmission
  • miles
While driving vehicle stalled. The consumer restarted vehicle, and had the vehicle towed to the dealer for inspection. The mechanic could not duplicate the problem. The consumer informed the mechanic that this problem occurred more than once. There was no warning.

- Tryon, NC, USA

problem #1

May 282004


  • 385 miles
Vehicle looses power and the engine will not go above 2000 RPM. This is not fast enough to go through an intersection without being hit or side swiped. Provide further details.

- Abilene, TX, USA

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