Trying to help out a friend. Vehicle is 08 silverado with 4.8 motor. P2138 code is present. He has previously prior to asking me to help swapped out TB and Accel pedal and still is getting P2138. I went over today to diagnose and get this with scanner. First pic is no throttle. 2nd pic is full throttle. Pedal does absolutely nothing engine rpm wise. You can floor it and there is no increase. In the process of troubleshooting I notice the temp is climbing on the engine to dangerous levels and shut it down. I'm guessing this might be related ... Looking through other threads I'm thinking maybe the fan clutch is bad and is pulling down the 5v to make the pedal look bad? Does that make sense? I would assume to diagnose I would need to pull the fan clutch connector and see if the problems go away? Any other things to try or check? Thanks in advance for any help!