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.


definitely annoying
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
35,000 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 drivetrain problems

drivetrain problem

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2004 Chevrolet Trailblazer EXT Owner Comments

problem #1

Nov 282006

Trailblazer EXT 4WD 6-cyl

  • Automatic transmission
  • 35,000 miles


Vehicle switching into 4WD/AWD on its own - malfunction took vehicle in because vehicle was trying to switch into AWD and 4WD on its own at freeway speeds. When this happens, entire vehicle jerks when switching (on its own) from 2hi to AWD. Chevy service department found problem in transfer case module. They replaced module and program. Vehicle 4WD malfunctioned again. Vehicle trying to switch into 4WD and AWD on its own. Took vehicle back to service department. Service department replaced encoder motor. Vehicle is still switching into 4WD and AWD randomly. I will take it in again. These problems started while still under warranty. I have under 43000 miles on vehicle at this time. Internet search shows many trailblazer owners with this same problem.

- Sheboygan, WI, USA

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