Ive been having an issue on my 2009 going into limp mode saying “reduced engine power”, “service traction”…

I’m having some trouble with the APP sensor on my 2009 Corvette C6. The car is throwing codes P2138 (APP Sensor 1-2 Correlation) and P2122 (APP Sensor 1 Circuit Low Voltage). Couple weeks ago it was both sensors that where out and I poked around with a multimeter for 12 hours and it weirdly was fixed, or so I thought...

Here’s what I’ve troubleshooted so far:
Voltage Readings directly from APP sensor.
• Dark blue wire/ E (Sensor 1 Signal wire): 0.88V rest to 4.5V when pressing the pedal.
• Light blue wire/B (Sensor 2 signal wire): 0.45V rest to 2.5V when pressing the pedal.

I removed my fender to access the ECU, and checked continuity between the APP sensor and the ECM plugs itself (PIN 32 & 29), and there’s no break in the wires. Resistance on the dark blue wire (sensor 1) seems high though (84ohms?). No shorts to ground either. However, the voltage readings are identical from both ends of the wires at APP & ECU, so I assumed the wire condition is okay(?) I do have a new power wire running through the firewall wiring harness to an amp, idk if that could mess with it, I have used proper equipment.
Anyways it’s just been a continuous headache any if anyone has any input at all I would really appreciate it.

Questions:

1. What are the normal voltage ranges for these sensors? Are they supposed to be different?
2. Is this likely a pedal issue, or could it be a wiring problem?
3. Should I replace the pedal, or do more tests?

Thanks for any help!

 

Both APP1 and 2 are pull up circuits…1st screenshot is idle and 2 is WOT…are you referencing any Service Info trying to determine what is wrong ??…have you checked the code setting criteria for these DTC’s ??

 

With sensor unplugged you should see 5 volts on the white/black and tan wires...these are your 5 volt reference wires...with the connector plugged in and car running you should check both "reference low” or computer ground wires...they are brown and purple…back probing with a DVOM you should see less than 100 mv's (0.1 volts)...this goes for any sensor ground wire.