One problem related to gas recirculation valve (egr valve) 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.
I was traveling at approximately 55mph on a smooth paved county road with my a/c on. It was about 78 degrees outside. I had the a/c running about 15 minutes before the air just turned warm. I tried 3 times turning off the a/c and back on, and the air failed to cool. I stopped the truck, turned the a/c on, got out and looked at the a/c compressor. The a/c compressor was not engaging. I took it to a mechanic and the diagnosis was undetermined. 2 other mechanics failed to find the problem as well. The system was charged correctly, not leaking, and even replaced the hvac control module and the problem was not fixed. There are many other cases just like mine and I would like gm to look into the problem. I am proud to be a gm customer and have always liked my gm pickups.