So I recently replaced the valve covers on my 03' durango with a 4.7. After I hooked everything back up, my check engine light came on and was spitting a p0113 (IAT Sensor Circuit High Input Problem), p0118 (ECT Sensor Circuit has higher than normal voltage), and a p0108 (Manifold absolute pressure (MAP) sensor/barometric pressure (BARO) sensor -high input). It had non of these codes when starting the project, but now that i'm done, they pop up. I'm thinking because they are all high voltage related its a grounding wire problem, But i cant seem to find any schematics online to help. Anyone know what the problem could be or where I could find the schematics?

 

More likely there is a pinched wire somewhere, and you are feeding 12 volts to sensors that only want 5........ Test a couple of the sensors in question with a meter. See what kind of voltage you see on the assorted pins.

 

high voltage codes set when the circuit is open...the circuit is reading the potential voltage of an open circuit. check for connectors not seated or not plugged in