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.

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hardly worth mentioning
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
120,739 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 Avalanche engine problems

engine problem

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2004 Chevrolet Avalanche Owner Comments

problem #4

Jul 032014


  • 117,957 miles


The exhaust manifolds bolts are snapping off which is causing leaking and noises (ticking sounds near drivers side) which can be smelled in the cabin and heard in the cabin of vehicle. I been told by other mechanics that this is a severe problem with 5.3 liter and 6.0 liter engines made by GM.. this repair will be in the thousands to fix.

- Fresno, CA, USA

problem #3

Dec 152014


  • 116,000 miles
The contact owns a 2004 Chevrolet Avalanche 1500. While driving at unknown speeds, the low coolant and check engine warning lights illuminated. The vehicle was taken to the dealer, where it was diagnosed that the cylinder head needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 116,000.

- Ogden, UT, USA

problem #2

Oct 112014

Avalanche 4WD 8-cyl

  • 136,000 miles
Vehicle started experiencing a gradual coolant loss, found out vehicle has a manufactured faulty cylinder head(s) from castech. Will cost $$$$ to repair. GM will not address the problem except with GM #06-06-01-019B information on gradual coolant loss over time with no evidence of leak found, (June 12, 2007).

- Whitelaw, WI, USA

problem #1

Feb 172014


  • 113,000 miles
The exhaust manifolds fastners are snapping off which is causing carbon monoxide to fill the cabin area of the vehicle. This hazard jepordizes the health of every person driving or riding as a passenger in the V8 powered vehicles. This is happening to newer models as well. GM is wanting to charge the consumer $1,500-$3,000 to due repairs for defective parts.

- Patrick Afb, FL, USA

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