flickering shift indicator light

[joshbowhunter]

My 2002 Silverado 6.6 Duramax shift indicator light flickers no codes runs and drives fine just cant see what gear Im in.The oil change light flickers too.Does anybody have a wiring diagram for the box on the fan shroud.I think thats were my problem is.

[DmaxMaverick]

The "box" on the fan shroud is actually 2 "boxes". The PCM and TCM. Unless you have a real reason to suspect a problem there, such as physical damage, that's not it. Your problem is much more likely a failed IPC (instrument panel). Not too costly, and easy to R/R. About $100 to repair, if you R/R, yourself. If you replace it with another (new or used), you'll need to make a trip to the dealer for programming.