'02 1500HD crew cab. My rig has 148K on the Ode and last month my light came on the dashboard. Took it down to the local mechanic and he hooked it up on the computer. Couldn't find a code for diagnosing the problem. Moved a few wires under the hood and charged me $100 for the effort. Light stayed off for 2 weeks and has come back on again. Anyone know what is up??? Gotta love having to go throiugh the computer bs only to get no definitive answer.