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Engine-Codes – Toyota – P2138 2006 Toyota Highlander

P2138 2006 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation

Quick Answer

The P2138 diagnostic trouble code (DTC) for a 2006 Toyota Highlander indicates a problem with the Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation. Common causes include Faulty throttle pedal position sensor, Wiring or connector issues in the throttle pedal position sensor circuit, ECM software or hardware malfunction. 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 2006 Toyota Highlander indicates Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation.
Common causes
Common causes include Faulty throttle pedal position sensor, Wiring or connector issues in the throttle pedal position sensor circuit, ECM software or hardware malfunction.
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 17, 2024
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Code P2138 2006 Toyota Highlander Description

The P2138 diagnostic trouble code (DTC) for a 2006 Toyota Highlander indicates a problem with the Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation. This code specifically relates to a discrepancy between the voltage signals from two separate sensors in the throttle pedal position system. In modern vehicles, electronic throttle control systems have replaced traditional mechanical throttle linkages. These systems rely on sensors to monitor the position of the throttle pedal and communicate this information to the engine control module (ECM) to adjust the throttle opening accordingly.

OBDII Code P2138 2006 Toyota Highlander - Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation
P2138 2006 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation

Common Causes of P2138 2006 Toyota Highlander

  1. Faulty throttle pedal position sensor
  2. Wiring or connector issues in the throttle pedal position sensor circuit
  3. ECM software or hardware malfunction
  4. Corrosion or contamination in the sensor connectors
  5. Mechanical obstruction in the throttle pedal assembly

Symptoms of P2138 2006 Toyota Highlander

  1. Reduced engine power
  2. Hesitation or lack of response when pressing the accelerator pedal
  3. Rough idling or unstable engine RPM
  4. Stalling or difficulty starting the engine
  5. Illumination of the Check Engine Light

How to Fix P2138 2006 Toyota Highlander

  1. Begin by conducting a thorough inspection of the throttle pedal position sensor and its wiring harness to check for any visible damage or loose connections.
  2. Use a multimeter to test the voltage output of sensors 'D' and 'E' while operating the throttle pedal to ensure they are within the specified range.
  3. If the voltage signals do not correlate, replace the faulty throttle pedal position sensor with a new, OEM-quality part.
  4. Clear the DTC from the ECM memory using a diagnostic scan tool and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, further diagnostic procedures may be necessary to identify any underlying issues with the throttle control system.

Cost to Fix P2138 2006 Toyota Highlander

The typical repair costs for addressing a P2138 code in a 2006 Toyota Highlander can range from $200 to $500, including parts and labor. However, it is essential to note that the specific diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships, while independent shops often offer lower rates. It is advisable to obtain quotes from local repair facilities to get a more accurate estimate for this repair.

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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 2006 Toyota Highlander Code

1. What does OBDII code P2138 mean for my 2006 Toyota Highlander?

- OBDII code P2138 indicates an issue with the Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation in your vehicle.

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

- Common symptoms of a P2138 code may include reduced engine power, hesitation or stalling when accelerating, and the vehicle going into limp mode.

3. What are the possible causes of a P2138 code on a 2006 Toyota Highlander?

- The P2138 code on a 2006 Toyota Highlander can be caused by a faulty throttle position sensor, issues with the throttle body, wiring problems, or a malfunctioning electronic control module.

4. How serious is a P2138 code on a Toyota Highlander?

- A P2138 code should be taken seriously as it can affect the performance and drivability of your Toyota Highlander. It is best to address the issue promptly to prevent further damage.

5. Can I continue driving my Toyota Highlander with a P2138 code?

- It is not recommended to continue driving your Toyota Highlander with a P2138 code, as it may lead to further damage or safety concerns. It is best to have the issue diagnosed and repaired as soon as possible.

6. What are some DIY repair tips for a P2138 code on a 2006 Toyota Highlander?

- DIY repair tips for a P2138 code may include checking the throttle position sensor for proper operation, inspecting the wiring for any damage, and cleaning the throttle body to ensure proper functioning.

7. How much does it typically cost to repair a P2138 code on a Toyota Highlander?

- The cost of repairing a P2138 code on a Toyota Highlander can vary depending on the underlying cause of the issue. It is recommended to get a diagnostic from a qualified mechanic for an accurate estimate.

8. Can a P2138 code be reset without fixing the underlying issue?

- While you can clear the P2138 code using an OBDII scanner, it is not recommended to do so without addressing the underlying issue. The code is likely to reappear if the problem is not fixed.

9. Is it possible to prevent a P2138 code from occurring in my Toyota Highlander?

- Regular maintenance, such as keeping the throttle body clean, checking the throttle position sensor, and addressing any wiring issues promptly, can help prevent a P2138 code from occurring in your Toyota Highlander.

10. How long does it take to repair a P2138 code on a 2006 Toyota Highlander?

- The time it takes to repair a P2138 code on a 2006 Toyota Highlander can vary depending on the specific cause of the issue and the availability of parts. It is best to consult with a mechanic for an estimated repair time.

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