P2138 is a diagnostic trouble code that indicates a voltage correlation issue between the throttle or pedal position sensor or switch.
P2138 Throttle/Pedal Pos Sensor/Switch D E Voltage Correlation
Code symptoms P2138.
– Engine stalling or hesitation
– Sudden loss of power
– Vehicle entering “limp mode”
– Throttle response irregularities
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P2138.
1. Faulty throttle position sensor.
2. Defective pedal position sensor.
3. Wiring issues.
4. Improper sensor calibration.
5. ECM malfunction.
Code Solutions P2138.
1. Inspect the throttle position sensor (TPS) wiring harness and connectors for any signs of damage or corrosion. Repair or replace any damaged components.
2. Check the throttle body for any carbon buildup or debris that may be obstructing the sensor’s operation. Clean the throttle body as needed.
3. Verify proper voltage and resistance readings from the throttle position sensor using a multimeter. Replace the sensor if readings are outside of the manufacturer’s specified range.
4. Reset the vehicle’s engine control module (ECM) and perform a throttle relearn procedure to recalibrate the sensor. This can often resolve voltage correlation issues.
5. If the issue persists, consult the vehicle’s service manual or seek assistance from a qualified mechanic to further diagnose and potentially replace the throttle position sensor or related components.