Pedal position sensor D/E correlation
What P2138 means
Your car's computer set P2138: Pedal position sensor D/E correlation. It belongs to the fuel and air metering group of codes. It is a generic code, so it means the same thing on every make. The check engine light usually comes on once the fault has been seen on two drives in a row. Until then it shows up as a pending code.
Can I keep driving? The car may go into limp mode with low power. Get it fixed soon.
Common causes
- Failed throttle or pedal position sensor
- Dirty throttle body
- Wiring or connector problem
Fix the cheapest, most likely cause first. Clearing the code without a repair only turns the light off until the fault comes back.
Check it yourself
Watch throttle position on the Graph tab while slowly pressing the pedal. Jumps or dropouts point to the sensor.
Torque Deck reads P2138 with a cheap Bluetooth OBD2 adapter. It also shows the freeze frame (engine conditions at the moment the code set) and the live data you need to narrow it down.
Parts
Parts most often replaced for P2138: throttle position sensor. Confirm the cause first, and match the part to your exact engine.
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Related codes
This page explains what the code usually means. It is not a diagnosis of your car. When in doubt, ask a mechanic.