Two problems related to engine and engine cooling have been reported for the 2003 GMC Sierra 2500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 GMC Sierra 2500 based on all problems reported for the 2003 Sierra 2500.
I own a 2003 GMC duramax 167000 miles, it has been a great truck until recently, after engine gets hot it will not start back up until it has cooled off! have not been able to find the problem yet, but found a lot of complaints online from people with the same problem, [injectors], very expensive to repair!!! this problem is very frustrating, would be great if general motors would correct this problem!!!!.
While driving on the highway, my 2003 GMC Sierra 2500 displayed a "reduced engine power" warning on my dashboard. My vehicle lost all speed control, decelerating from 65 mph to 20 mph in a matter of seconds. I immediately pulled over to the side of the highway and shut my truck off. Once I restarted the vehicle, the message was gone and my truck was fine. It was a very scary incident not being able keep the right speed for the conditions on the highway.
| Car Stall problems | |
| Engine And Engine Cooling problems | |
| Engine Exhaust System problems | |
| Service Engine Light On problems | |
| Engine Oil Leaking problems |