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P2138 Honda Code - Accelerator Pedal Position Sensor A/B Incorrect Voltage Correlation

Quick Answer

The P2138 Honda code refers to an issue with the Accelerator Pedal Position Sensor A/B, indicating that there is an incorrect voltage correlation between the two sensors. Common causes include Faulty Accelerator Pedal Position Sensor A/B, Wiring or connector issues leading to poor electrical connections, Corrosion or damage to sensor components. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P2138 Honda indicates Accelerator Pedal Position Sensor A/B Incorrect Voltage Correlation.
Common causes
Common causes include Faulty Accelerator Pedal Position Sensor A/B, Wiring or connector issues leading to poor electrical connections, Corrosion or damage to sensor components.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Aug 30, 2024
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Code P2138 Honda Description

The P2138 Honda code refers to an issue with the Accelerator Pedal Position Sensor A/B, indicating that there is an incorrect voltage correlation between the two sensors. The accelerator pedal position sensor is responsible for sending signals to the engine control unit (ECU) regarding the position of the accelerator pedal, which in turn determines the amount of fuel to be injected into the engine. When there is a discrepancy in the voltage readings between the two sensors, it can lead to inaccurate throttle response and potentially affect the vehicle's performance and drivability. This issue can result in poor acceleration, rough idling, stalling, and even trigger the vehicle into limp mode, where it operates at reduced power to prevent further damage.

OBDII Code P2138 Honda - Accelerator Pedal Position Sensor A/B Incorrect Voltage Correlation
P2138 Honda Code - Accelerator Pedal Position Sensor A/B Incorrect Voltage Correlation

Common Causes of P2138 Honda

  1. Faulty Accelerator Pedal Position Sensor A/B.
  2. Wiring or connector issues leading to poor electrical connections.
  3. Corrosion or damage to sensor components.
  4. Issues with the ECU or related control modules.
  5. Environmental factors such as moisture or exposure to extreme temperatures affecting sensor performance.

Symptoms of P2138 Honda

  1. Reduced acceleration or lack of response when pressing the accelerator pedal.
  2. Engine surging or hesitation while driving.
  3. Rough idling or stalling when coming to a stop.
  4. Illumination of the Check Engine Light on the dashboard.
  5. Vehicle going into limp mode, limiting power output.

How to Fix P2138 Honda

  1. Diagnose the issue using a scan tool to verify the P2138 code and check for any related codes.
  2. Inspect the wiring and connectors for damage or corrosion, repairing or replacing as necessary.
  3. Test the Accelerator Pedal Position Sensor A/B for proper voltage output and signal consistency.
  4. If the sensors are faulty, replace them with OEM or high-quality aftermarket parts.
  5. Clear the codes, reset the ECU, and perform a test drive to ensure the issue has been resolved.

Cost to Fix P2138 Honda

The typical repair costs for addressing a P2138 Honda code can vary depending on the extent of the issue and the specific parts that need to be replaced. On average, the cost for parts such as the Accelerator Pedal Position Sensor A/B can range from $100 to $200, while labor costs may add another $100 to $200. Overall, the total repair cost could be in the range of $200 to $400. It's important to note that these estimates are general guidelines and actual costs may vary based on location, vehicle make and model, and the shop's labor rates. It's recommended to consult with a trusted mechanic or auto repair shop for a more accurate cost estimate.

What does this mean?

Tech Notes for P2138 Honda





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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2138 Honda Code

1. What are the common symptoms of OBDII code P2138 on a Honda?

The common symptoms include reduced engine power, hesitation or stalling when accelerating, and the vehicle going into limp mode.

2. What are the possible causes of OBDII code P2138 on a Honda?

The code P2138 typically indicates a problem with the accelerator pedal position sensor or the throttle position sensor. It could be due to a faulty sensor, wiring issues, or a problem with the throttle body.

3. How can I diagnose the issue causing OBDII code P2138 on my Honda?

Diagnosing the issue involves checking the wiring and connectors related to the accelerator pedal position sensor and throttle position sensor. It may also require testing the sensors themselves using a multimeter.

4. Can I drive my Honda with OBDII code P2138?

It is not recommended to drive your Honda with code P2138 as it can affect engine performance and potentially lead to safety issues. It's best to address the problem promptly.

5. How can I repair OBDII code P2138 on my Honda?

Repairing the issue may involve replacing the accelerator pedal position sensor, throttle position sensor, or repairing any damaged wiring. It's also important to clear the code after making the necessary repairs.

6. Are there any tips to prevent OBDII code P2138 from occurring again?

To prevent the recurrence of code P2138, ensure regular maintenance of the sensors and wiring, avoid harsh driving habits, and address any issues promptly to prevent further damage.

7. Can resetting the OBDII code P2138 on my Honda fix the problem?

Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing code P2138. It's essential to diagnose and repair the problem to prevent it from coming back.

8. Will OBDII code P2138 affect fuel efficiency on my Honda?

Yes, code P2138 can affect fuel efficiency as it can lead to improper air-fuel mixture and engine performance issues. Resolving the code promptly can help restore optimal fuel efficiency.

9. How much does it typically cost to repair OBDII code P2138 on a Honda?

The cost of repairing code P2138 can vary depending on the extent of the issue, the parts needed for replacement, and labor costs. It's advisable to consult a professional mechanic for an accurate estimate.

10. Can I clear OBDII code P2138 on my Honda using an OBDII scanner?

Yes, you can clear code P2138 using an OBDII scanner, but it's crucial to address the underlying problem causing the code before clearing it. Otherwise, the issue may persist and trigger the code again.

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