2003 GMC Sierra power train problems
29 owner complaints filed with NHTSA name the power train on the 2003 GMC Sierra — 14% of all complaints for this model year.
What owners report
“I was parked on a sloped driveway (about 10 - 15 degrees). I started the engine, stepped on the brake pedal and took the car out of park into drive. Brake pedal was normal. I started to roll forward and when I pushed the brake pedal the car did not slow. I slammed the brake pedal and it went all…”
filed Sep 10, 2014
“Truck was entering major highway,traffic begins too slow due to rush hour ,seeing this occur I stepped on brakes expecting to slow down ,until I realized pedal had gone all the way to floor,then I let up an pushed to floor again-no brakes no room to go left or right impact was unavoidable,impacted…”
filed Jul 17, 2012
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
This informational bulletin provides technicians with information regarding automatic transmission oil cooler flow test essential tool J-45096 TransFlow®.
02-07-30-052J · Service Bulletin/Repair Instructions · issued May 29, 2015
Power Train problems in other Sierra years
| Year | Reports | Share |
|---|---|---|
| 2017 Sierra | 23 | 38% |
| 2015 Sierra | 6 | 11% |
| 2014 Sierra | 10 | 10% |
| 2013 Sierra | 5 | 13% |
| 2012 Sierra | 2 | 7% |
| 2011 Sierra | 6 | 14% |
| 2010 Sierra | 1 | 3% |
| 2008 Sierra | 2 | 3% |
| 2007 Sierra | 4 | 7% |
| 2006 Sierra | 2 | 4% |
| 2005 Sierra | 11 | 9% |
| 2004 Sierra | 18 | 10% |
Other reported problem areas on the 2003 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.