One problem related to catalytic convertor has been reported for the 2003 Chevrolet Silverado 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Chevrolet Silverado 1500 based on all problems reported for the 2003 Silverado 1500.
Just 100 miles after pcm was replaced , out of warranty, engine warning light came on. Since unable to get to dealership fast enough I did some research in my manual, which stated that if I shut down vehicle and light goes off then probably nothing major to worry about. Intermittently the light has came on, then gone off for the past 4000 miles. So with my oil change, had dealership run test on diagnostics, found bad catalytic converter. Cost of repair, $ 862. Well, I don't have that kind of money just floating around. Therefore, I couldn't get it done this time around. So I don't have that fixed. I was told gm gives up to 80,000 warranty on the pcm module and the catalytic converter. Strange how the light came on just 100 miles over the last work done. Why is this happening to me and my truck?.