Throttle/Pedal Pos Sensor/Switch D / F Voltage Correlation
P2139 indicates a voltage correlation mismatch between the throttle position sensor and pedal position sensor signals. The engine computer detected that these two sensors are not reading consistently with each other, which prevents proper throttle control and fuel delivery.
What You Might Notice
- Engine stalling at stops or idle
- Complete loss of engine power
- No acceleration response
- Sudden power loss while cruising
- Check engine light illuminated
Most Common Causes
- 1
Faulty Throttle Position Sensor
The TPS may be sending inconsistent voltage signals that don't correlate with actual throttle position. This is one of the most common causes of correlation faults.
- 2
Faulty Pedal Position Sensor
The accelerator pedal position sensor may be failing or providing erratic voltage signals that don't match the throttle opening.
- 3
Wiring or Connector Issues
Corroded, loose, or damaged wiring between the sensors and engine computer can cause voltage signal degradation and mismatches between sensor readings.
- 4
Engine Control Module Fault
The ECM itself may have internal issues preventing proper sensor signal interpretation or correlation logic, though this is less common.
How to Diagnose It
- 1
Check Faulty Throttle Position Sensor — The TPS may be sending inconsistent voltage signals that don't correlate with actual throttle position. This is one of the most common causes of correlation faults.
- 2
Check Faulty Pedal Position Sensor — The accelerator pedal position sensor may be failing or providing erratic voltage signals that don't match the throttle opening.
- 3
Check Wiring or Connector Issues — Corroded, loose, or damaged wiring between the sensors and engine computer can cause voltage signal degradation and mismatches between sensor readings.
- 4
Check Engine Control Module Fault — The ECM itself may have internal issues preventing proper sensor signal interpretation or correlation logic, though this is less common.
How to Fix It
- 1
Test and Replace Throttle Position Sensor
Use a diagnostic scanner to monitor TPS voltage signals under acceleration. If readings are erratic or don't correlate with pedal movement, replace the TPS with an OEM or quality aftermarket unit.
- 2
Inspect and Clean Sensor Connectors
Remove and inspect connectors for both the throttle and pedal position sensors. Clean any corrosion from connector pins and ensure connections are tight and secure.
- 3
Test and Replace Pedal Position Sensor
Monitor accelerator pedal sensor voltage output with a scanner. If readings don't smoothly correlate with pedal movement or show voltage spikes, replace the pedal position sensor.
- 4
Check Wiring and Repair Damaged Circuits
Inspect wiring harnesses between sensors and ECM for damage, pinching, or corrosion. Repair or replace damaged sections and verify proper grounding at both sensors.
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