Thread: 4 Codes - PCM?

Hey guys,

Throwing four codes and I'm beginning to think it is a bad ground connection. Do the MAP, TPS and CPS utitlize the PCM for ground on 97 GTs? Or could it be a loose connector?

P0107 MAP sensor high input
P0108 MAP low input
P0121 TPS circuit
P0336 CPS circuit

you map sensor harness bad? or its shot.

Pop the loom from the radiator to the map/tps and see if you find a ground splice. If not, then it's getting ground from right by the ICM.

No, you should diagnose the issue. At least, that's what I would do.

Check the voltage and grounds to the various sensors. Trace them back if necessary. Check your battery cable connections for corrosion or being loose.