Code Definition

P2139 — Accelerator Pedal Position Sensors 1 and 3 Voltage Correlation

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P2139

P2139 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P2139 is stored, the module has detected a correlation fault — two sensors that should track each other have diverged beyond tolerance; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P2139 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

DTC P2139 indicates a voltage correlation fault between accelerator pedal position sensors 1 and 3. The accelerator pedal assembly contains redundant position sensors whose voltages must track each other in a fixed proportion throughout pedal travel, allowing the control module to verify driver demand and detect a faulty signal. The code sets when the voltage relationship between sensor 1 and sensor 3 falls outside the calibrated tolerance, so the two signals no longer agree as expected. This is a correlation fault intended as a safety check, and it usually drives the system into a reduced pow...

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