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 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
92,000 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 GMC Envoy XL exhaust system problems

exhaust system problem

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2004 GMC Envoy XL Owner Comments

problem #3

Jul 162010

Envoy XL

  • 81,000 miles


2004 GMC Envoy 4.2 liter engine - defective exhaust manifold. Noticed casting crack at 81,000 miles replaced complete manifold, 02 sensor, gaskets at 89,000 miles. According to dealer no recall or extended warranty on this part that many others have had crack.

- Holly, MI, USA

problem #2

May 152010

Envoy XL

  • 117,000 miles
I heard a clicking noise from under the hood and after pulling off the cover plate for the engine exhaust manifold I saw the manifold was cracked. At idle speed fumes get inside vehicle. Repair has not been made so old part is available. Upon research on the internet there are numerous other complaints of this problem. I sent an E-mail to GM and someone called and said they need more people to report it to get something done. I believe it is a safety issue because of the fumes and possible fire hazard.

- Columbus, MS, USA

problem #1

Jul 072009

Envoy XL

  • 78,000 miles
Started to hear loud rattle coming from rear of vehicle, thought maybe a heat shield around muffler went bad. Took it into the shop and they stated "not sure what happened, though you have something that has come loose in the resonator". around $100 to get the resonator removed, have not quoted a new one from the dealer yet. I would imagine the replacement part will fail just as the original part has done.

- Paw Paw, MI, USA

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