Power train PCM defective with transfer case with bad designing with shoe pump, and brake line corroded and leak. Brake system will not prevent vehicle to stop when brake lines are leak. For my 2004 I was lucky driving on slow speed on city road, and I was able to use emergency brake to stop my truck.

- Milwaukee, WI, USA

Transfer case nv 246 internal oil pump wears hole in magnesium case and leaks oil completely out of transfer case. Oil coats underside of vehicle including hot exhaust system. Smoke appeared from vehicle. Transfer case made abnormal grinding noise and then overheated damaging internal components. Transfer case requires replacement. Vehicle was completely disabled because of failure. Fire was averted. Vehicle maintained at dealer exclusively except for oil changes. Dealer never provided any info regarding potential major design flaw. Repair quote from dealer $2200.

- Saint Petersburg, FL, USA

Steering column clunking, speedometer not working, transmission stopped working.everything started going wrong about. 63,000 K. I have 116,000 know. 2004 Z71 crewcab.

- Cambridge, 00, USA

Since the purchase of my vehicle, there have been multiple issues with the vehicle 7-8 issues, one selling point was the onsatr cellular service, never worked, etc. Etc. Etc. The salient matter at this time is that the drive train orginally exhibited a clincking sound shifting from 2nd-3rd and from 3rd-2nd, the noise was sporadic and went from a clincking to a decirnable clunk all the time, the dealer has attempted multiple repairs and now states the matter is a concern but it is not a problem, the oem, GMC, has states that ther is nothing they can do, the problem is getting worse and I am running out of options, I can not sell it as is.

- Effort, PA, USA