Two problems related to electrical system have been reported for the 2005 GMC Sierra 3500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 GMC Sierra 3500 based on all problems reported for the 2005 Sierra 3500.
Speedometer was off a lot!! 74 mph while sitting still, 130+ mph while driving at normal road speeds. I did not know how fast I was traveling. School zones etc. Never know if I was speeding or not. This happened several times while on vacation in California. Sometimes it was normal, but it got worse. It first happened at about 65,000 miles. I contacted my dealer and was told it may be under warranty, as many have had this same problem. They said my 2005 GMC did not fall under a warranty. I had to pay $356. 70 plus tax to have the instrument cluster replaced. I asked for the old parts, but was told gm needed it back so they could rebuild it for the next failure!! it seems gm is covering certain serial number vehicles built prior to mine. 2003 and 2004 model years, but mine is a 2005 and its not covered! why? I have never heard of such a problem, and I have owned 11 gm made vehicles and never had a speedometer go bad. Hopefully you can get them to cover this.
Parts of the cluster, tachometer, fuel guage, oil pressure, amp guage have failed one after the other. Although 04 model was covered under a recall, the same exact cluster was used in the 05 GMC and nothing has been done and not covered under warranty. Several GMC owners have this same issue.
| Electrical System problems | |
| Dashboard Failed problems |