One problem related to automatic transmission has been reported for the 2003 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 GMC Sierra 1500 based on all problems reported for the 2003 Sierra 1500.
Loss of 3rd gear. Tries to shift into 3rd gear and just red line's.
| Power Train problems | |
| Transmission Failure problems | |
| Driveshaft problems | |
| Automatic Transmission Cooler problems | |
| Power Train Driveline problems | |
| Automatic Transmission problems |