P2138 OBD-II Trouble Code: Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation

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Cost of diagnosing the P2138 code

P2138 is a diagnostic trouble code (DTC) for "Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $114.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
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P2138 Code Definition

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

What the P2138 code means

The P2138 trouble code indicates that the Engine Control Module has detected a malfunction within the D and/or E circuits of the throttle position sensor.

What are the causes of the P2138 code?

  • A defective throttle body motor

  • A damaged connector or wiring that is associated with the throttle body motor

  • A faulty throttle position sensor

  • A damaged connector or wiring that is associated with the throttle body motor

  • A faulty Engine Control Module

What are the symptoms of the P2138 code?

  • Vehicle may stall
  • Vehicle may not start
  • Vehicle may not accelerate well
  • A Check Engine Light will be illuminated

How does a mechanic diagnose the P2138 code?

  1. A mechanic may begin diagnosing the P2138 trouble code by locating the throttle body under the hood of the vehicle.

  2. Once located, the throttle body motor and throttle position sensor will be examined for circuitry issues related to the wiring and connectors.

  3. After that the mechanic would then test the throttle body motor and the throttle position sensor for proper function using the manufacturer’s recommended procedure.

  4. Finally, the mechanic would then test the Engine Control Module for proper function.

Any parts found to be faulty during this diagnosis would be replaced at the customer’s request.

Common mistakes when diagnosing the P2138 code

An easy mistake to make when diagnosing the P2138 trouble code would be to have the throttle position sensor replaced and ‘hoping’ it fixes the problem. Although this is one of the most common causes of the P2138 trouble code, it is not always the cause. Taking this into consideration, it is always important to fully test every aspect of a circuit to diagnose an electrical problem correctly.

How serious is the P2138 code?

I would consider the P2138 trouble code to be very serious. If I am late to work due to the fact that my car is not accelerating properly or stalling on the side of the road, I am not going to be very happy. With that said, I would recommend to anyone that has a P2138 trouble code stored to have the issue handled immediately.

What repairs can fix the P2138 code?

Additional comments regarding the P2138 code?

Do not ever try to manually open the butterfly valve in an electronic throttle body with your hand or any other tool. This can severely damage the electronic throttle body motor and possibly prevent the vehicle from being operational. It is always best to use safe and cautious practices when working with electrical equipment.

Need help with a P2138 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

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Related questions

On slow moving traffic, when i release the brakes, the car has lags for half a second before take off... computer scan shows p2138
This code is related to a faulty throttle position sensor (https://www.yourmechanic.com/services/throttle-position-sensor-replacement). The throttle position sensor (TPS) is a sensor used to monitor the throttle position of a vehicle. The sensor is usually located on the butterfly spindle/shaft so that it...
I get trouble code P2138, but I have cleared it and the car works for a while. Now I am getting trouble code P2127 along with P2138.
Hi there. The pedal position sensor on the gas pedal has lost signal for the switch 'E' and 'D'. The code P2138 (https://www.yourmechanic.com/article/p2138-obd-ii-trouble-code-throttle-pedal-position-sensor-switch-d-e-voltage-correlation-by-andrew-quinn) means that the computer has discovered a malfunction with the pedal sensor. Check the harness to the...
2009 Buick Lacrosse is setting DTC codes P2125 and P2138.
Hi there. Try performing a snap throttle and see if the wave form changes on the Oscilloscope. If the waves do not change when performing a snap throttle, then the throttle position sensor on the pedal needs replaced. If the...

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