What causes a P2139 code?

P2139 can be triggered by several issues — see the verified probable causes and step-by-step diagnostics shared by mechanics and owners on OBDIY.

Can I drive with a P2139 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P2139 active.

Follow the step-by-step diagnostic on this page, then read the verified fixes contributed by other Heavy Truck owners — the answer marked "Verified Cause" worked for the original poster.

OBDIY

OBD-II

P2139

Throttle/Pedal Position Sensor/Switch D/F Voltage Correlation

What it means

The Engine Control Module (ECM) detects a voltage mismatch or signal inconsistency between two or more redundant throttle position sensors (TPS) or accelerator pedal position (APP) sensors.