Two problems related to engine exhaust system have been reported for the 2003 GMC Envoy. The most recently reported issues are listed below.
No events led up to failure. Exhaust manifold is cracked and leaking. GMC Envoy xl slt 6 liter. Have not yet received new part. Will be replacing this week.
Throat of gas tank leaking on a 2003 Envoy. Reviewing internet, found many similar problems on the Envoy's and stated in 2007 that NHTSA was investigating. Mechanic stated very unusual to leak in that spot. Also, have replaced both head light sockets due to burning up. Have talked to many Envoy owners with the same problem. When bulb burns out and the recommended bulb is put in place the socket and wiring gets so hot that the socket is charred and is no longer functional. Wires have to be cut and a new socket wired in.