P2138 — Throttle/Pedal Position Sensor D/E Voltage Correlation
| Meaning | The engine computer noticed a disagreement between the two sensors that track how far you are pressing the accelerator pedal. Because they don't match, the computer doesn't know for sure what you want to do and limits engine power for safety. |
| Family | Powertrain (P) |
Typical symptoms
The check engine light is on
The vehicle may enter a limited power mode often called limp mode
Common causes
Poor electrical connection or corrosion in the pedal wiring harness
Internal failure inside the engine control module
What to do
Frequently asked questions
What does code P2138 mean?
Throttle/Pedal Position Sensor D/E Voltage Correlation. The engine computer noticed a disagreement between the two sensors that track how far you are pressing the accelerator pedal. Because they don't match, the computer doesn't know for sure what you want to do and limits engine power for safety.
Can I keep driving with code P2138 active?
With caution: limp mode possible, have it checked soon
Common causes — P2138
Faulty accelerator pedal position sensor assembly Poor electrical connection or corrosion in the pedal wiring harness Internal failure inside the engine control module
How do you fix code P2138?
Have a technician check the wiring plug at the accelerator pedal and test the sensor signals with a diagnostic tool. Since this directly affects vehicle control and responsiveness, you should have it checked promptly.
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