Diagnostic Trouble Code
P2138 — Throttle/Pedal Position Sensor Voltage Correlation
Throttle/Pedal Position Sensor Voltage Correlation
Definition
The two throttle/pedal position sensor signals do not agree with each other. Modern drive-by-wire systems use redundant sensors for safety — when they disagree, the ECM limits engine power as a precaution.
Common Causes
- Faulty accelerator pedal position (APP) sensor assembly
- Wiring issue or intermittent connection
- Corroded connector pins
- Faulty throttle body (if the code references throttle position)