1999 Chevy Tahoe Codes

LIGGETT79

MEMBER
1999 CHEVROLET TAHOE

Electrical problem
1999 Chevy Tahoe V8 Four Wheel Drive Automatic 150k miles

I have a 1999 Chevy Tahoe, It is running a little rough. It keeps blowing out the 20a ENG-I fuse in the engine bay, once that fuse gets blown it triggers the codes p0340 and p0102. Ive unplugged the 4 o2 sensors and then tried it and it still blew the fuse, I also tried the maf sensor, I think the cam position sensor (the plug-in into the distributor), and the purge canister on the drivers side. What else might be causing the fuses to keep blowing and the codes to come up? The fuses only get blown when I start the truck.

3 Replies

BRIAN 1

MECHANIC
1,030 POSTS

You have a short to ground somewhere in the circuit. Trace the pink wire under the fuse box to the camshaft pos sensor, then to the vcm. You might find a wire pinched or grounded. Plus the pink wire goes from the underside of the fuse box to S108 which is splice 108, which feeds circuits to evap vent canister, mass air flow sensor, camshaft pos sensor, purge solenoid, and both O2 sensors. The problem might be in splice 108 it feeds all those circuits. It is very hard to diagnose electrical problems without looking at this vehicle, please post back with what you find or other questions.