One problem related to underhood wiring 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 started my 2003 chevy to let it warm up and went back in the house then came back out find the wiring for the heater under the passenger dash was on fire. The damage to the vehicle is still undetermined.