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Engine-Codes – Toyota – P2138 2008 Toyota Camry

P2138 2008 Toyota Camry Code - Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation

Quick Answer

The P2138 diagnostic trouble code for a 2008 Toyota Camry indicates a problem with the Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation. Common causes include Faulty throttle pedal position sensor, Faulty throttle position sensor, Damaged or corroded wiring/connectors. 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 2008 Toyota Camry indicates Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation.
Common causes
Common causes include Faulty throttle pedal position sensor, Faulty throttle position sensor, Damaged or corroded wiring/connectors.
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 Sep 08, 2024
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Code P2138 2008 Toyota Camry Description

The P2138 diagnostic trouble code for a 2008 Toyota Camry indicates a problem with the Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation. This code is triggered when there is a discrepancy between the voltage signals from the throttle pedal position sensor and the throttle position sensor. The throttle pedal position sensor detects the position of the accelerator pedal, while the throttle position sensor measures the position of the throttle plate in the engine. When these two signals do not correlate correctly, it can lead to issues with engine performance and drivability.

OBDII Code P2138 2008 Toyota Camry - Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation
P2138 2008 Toyota Camry Code - Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation

Common Causes of P2138 2008 Toyota Camry

  1. Faulty throttle pedal position sensor.
  2. Faulty throttle position sensor.
  3. Damaged or corroded wiring/connectors.
  4. Poor electrical connection between sensors and ECM.
  5. Software issue within the ECM.

Symptoms of P2138 2008 Toyota Camry

  1. Hesitation or lack of response when pressing the accelerator pedal.
  2. Engine stalling or rough idle.
  3. Loss of power during acceleration.
  4. The vehicle going into "limp mode" with limited performance.
  5. Illumination of the Check Engine Light on the dashboard.

How to Fix P2138 2008 Toyota Camry

  1. Perform a thorough diagnostic scan to confirm the P2138 code and pinpoint the exact cause of the issue.
  2. Inspect the throttle pedal position sensor, throttle position sensor, and related wiring for any visible damage or corrosion.
  3. Test the sensors for proper voltage output using a multimeter and compare the readings to manufacturer specifications.
  4. Replace the faulty sensor(s) or repair any damaged wiring/connectors as necessary.
  5. Clear the code from the ECM's memory and perform a road test to ensure the issue has been resolved.

Cost to Fix P2138 2008 Toyota Camry

The typical repair costs for addressing a P2138 code on a 2008 Toyota Camry can vary depending on the specific cause of the issue. On average, replacing a throttle position sensor or throttle pedal position sensor can range from $100 to $300 per sensor, including parts and labor. However, if wiring repairs or ECM reprogramming are needed, the cost may increase. It's recommended to consult with a certified mechanic or dealership to get an accurate estimate based on the specific diagnosis and required repairs. Keep in mind that labor rates and parts prices can fluctuate based on location and the service provider.

What does this mean?

Tech Notes for P2138 2008 Toyota Camry

2007-2010 Toyota Camry apply for the recall for a bad Accelerator Pedal Position (APP) Sensor. You can call Toyota and check to see if your vehicle applies for the recall.

Need more information about the P2138 2008 Toyota Camry code?

Need more information on how to fix the P2138 2008 Toyota Camry code? Get Access to Factory Service Manuals

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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 2008 Toyota Camry Code

1. What does the OBDII code P2138 mean on a 2008 Toyota Camry?

P2138 indicates a voltage correlation issue between the throttle pedal position sensors 'D' and 'E', which may cause problems with the car's drive-by-wire throttle system.

2. What are the common symptoms of a P2138 code?

Symptoms may include reduced engine power, the throttle not responding properly, the check engine light illuminating, or the vehicle entering "limp mode."

3. What causes the P2138 code to appear?

Common causes include a faulty throttle pedal position sensor, damaged wiring or connectors, or a problem with the engine control module (ECM).

4. Can I drive my 2008 Toyota Camry with a P2138 code?

It’s not recommended. The car may enter limp mode, limiting power and making it unsafe to drive. Address the issue promptly to avoid potential hazards.

5. How is the P2138 code diagnosed?

Diagnosis involves using an OBDII scanner to confirm the code, inspecting the throttle pedal position sensor and related wiring, and checking for proper voltage signals.

6. How do I fix the P2138 code on my 2008 Toyota Camry?

Repairs may include replacing the throttle pedal position sensor, repairing or replacing damaged wiring and connectors, or, in rare cases, reprogramming the ECM.

7. How much does it cost to fix the P2138 code?

Costs vary but typically range from $150 to $300 for parts and labor if replacing the throttle pedal position sensor. Wiring repairs can cost less, depending on complexity.

8. Can a dirty throttle body cause a P2138 code?

No, a dirty throttle body is unlikely to cause this code since it specifically relates to the throttle pedal position sensors and their voltage correlation.

9. Will resetting the check engine light fix the P2138 code?

Clearing the code without addressing the underlying issue will only temporarily turn off the light. The code will return if the problem persists.

10. How can I prevent the P2138 code from occurring again?

Regularly inspect and maintain the throttle pedal assembly, check for damaged wiring, and avoid excessive water or moisture exposure to electronic components.

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