Question about 2003 GMC Sierra
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Posted on Jan 02, 2017
SOURCE: 1989 gmc sierra 2500 problems
I just had the same problem. My speedometer was jumping up and down randomly, then would die completely...followed by all my other instruments. I thought i had a bad ground and spent hours looking. Soon followed a shifting problem where my it was not auto shifting. I had to manually change from 2-3, with no first gear. I immediately thought ground problem on the tranny. No luck again. Took it to have the codes read, which pointed to all shift solenoids, but i knew that could not be it. I was still set on a bad ground.
Took it to a transmission specialist to see if he had heard of the problem. He took a look and said it was the ignition switch. I though, how the hell does that have anything to do with...instruments....shifting...some many problems. Sure enough, i replaced and it runs like a champ. Hope this helps.
Posted on May 01, 2009
first you have to take of the bezel which is all held on with clips you have to put the shifter all the way down, while not running with the brake on tilt the wheel all the way downand pull gently on the bezel to start popping it off its big so take your time once thats off its like 4 7mm bolts that hold in the cluster and i clip of wires to remove carefully so it doesnt break and your done. its really easy
Posted on Feb 22, 2010
SOURCE: wiring diagram 2003 GmC Sierra
I need wiring digram for GMC 2003 SIERRA . I have the left head light working fine but the right I have no power to it. I have checked the fuses and relaysand so far have not found and broken or frayed wires.
Posted on Mar 06, 2010
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