2004 GMC Sierra electrical system problems
39 owner complaints filed with NHTSA name the electrical system on the 2004 GMC Sierra — 21% of all complaints for this model year.
What owners report
“Rusted out/ corroded brake lines burst while stopping for a deer running out on the road. Was warned of this problem upon purchase of the vehicle in 2010 and personally coated all brake lines b4 winter every year...never saw worse lines! I own classic cars that are twice as old with shiney original…”
filed Jan 7, 2016
“The heating and ac controls were replaced 2 times in 2007.and are still not working properly today I was driving home with the ac on because it's 99 degrees in los angeles county and like it has been doing for years it started blowing hot air on its own. I have see other gm vehicles with the same…”
filed Sep 16, 2014
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Electrical System problems in other Sierra years
| Year | Reports | Share |
|---|---|---|
| 2017 Sierra | 6 | 10% |
| 2015 Sierra | 1 | 2% |
| 2014 Sierra | 9 | 9% |
| 2013 Sierra | 5 | 13% |
| 2012 Sierra | 7 | 24% |
| 2011 Sierra | 3 | 7% |
| 2010 Sierra | 4 | 12% |
| 2009 Sierra | 9 | 24% |
| 2008 Sierra | 15 | 22% |
| 2007 Sierra | 7 | 12% |
| 2006 Sierra | 7 | 13% |
| 2005 Sierra | 23 | 20% |
Other reported problem areas on the 2004 GMC Sierra
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.