One problem related to underhood wiring has been reported for the 2003 Chevrolet Silverado 2500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Chevrolet Silverado 2500 based on all problems reported for the 2003 Silverado 2500.
Drove vehicle and noticed fan blower was not working, located fuse for blower, pulled and verified fuse is ok. Put fuse back in checked blower and fan was working. The next day my husband drove the vehicle for approx. 10 min and smoke started billowing out from under the dash (pass. Side). He turned around, came home and we used a fire extinguisher to put out the fire under the glove box and also covered by a plastic covering not quickly able to be removed. Disconnected the batteries and removed the cover exposing the wiring. We can see the wiring and relay that have melted. Called gm (11/3, 9 - 10 bus. Days to respond), the vehicle is over warranty coverage, because I don't feel that a 5yr vehicle should just catch on fire. Gm responded with a denial because of MA laws but I live in me so they are looking into it again with the cs rep that handles me. Meanwhile I do not have a vehicle to drive. Have an issue with taillight burning housing and daytime running light comes on and off. Socket looks burnt, light bulb is fine but does not consistently work. Have also had the speedo issue - gm fixed, replaced front hubs my cost, & replaced glow plugs. Now trying to determine if I'm having same tranny issues others have reported. So far not so impressed. Have reported fire issue to my insurance CO. To document problem. Until truck is plugged in it is impossible to determine extent of damage.