P2138 Fault Code

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

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2138 fault code indicates a problem with the throttle or pedal position sensor/switch D or E. This code appears when the Engine Control Module (ECM) detects a discrepancy between the signals being sent by the throttle position sensors. Proper throttle position is crucial for ensuring optimal engine performance, fuel efficiency, and emissions control.

What are the symptoms of the P2138 code?

• Check Engine Light illuminated.
• Unresponsive or sluggish acceleration.
• Engine stalling or hesitating.
• Poor fuel economy or increased emissions.

What causes the P2138 code?

• Faulty throttle position sensor/switch.
• Wiring issues or damaged connectors.
• Poor electrical connections or corrosion in the sensor circuit.
• Malfunctioning ECM or software issues.

How to fix P2138?

• Inspect the throttle position sensor and its wiring for signs of damage.
• Test the sensor's output voltage against manufacturer specifications.
• Replace the faulty sensor if necessary.
• Ensure all electrical connections are clean and secure.
• Clear the fault codes and test drive the vehicle to see if the problem returns.