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Engine-Codes – Toyota – P2138 2007 Toyota Highlander

P2138 2007 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation

Quick Answer

The P2138 diagnostic trouble code (DTC) for a 2007 Toyota Highlander refers to an issue with the Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation. Common causes include Faulty throttle pedal position sensor, Faulty throttle position sensor, Wiring or connector issues. 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 2007 Toyota Highlander indicates Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation.
Common causes
Common causes include Faulty throttle pedal position sensor, Faulty throttle position sensor, Wiring or connector issues.
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 14, 2024
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Code P2138 2007 Toyota Highlander Description

The P2138 diagnostic trouble code (DTC) for a 2007 Toyota Highlander refers to an issue with the Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation. This code indicates that there is a discrepancy between the voltage signals being sent by the throttle pedal position sensor and the throttle position sensor. In modern vehicles, the throttle pedal position sensor is responsible for sending the driver's input to the engine control module (ECM), which then adjusts the throttle position accordingly. The throttle position sensor, on the other hand, monitors the actual position of the throttle valve.

OBDII Code P2138 2007 Toyota Highlander - Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation
P2138 2007 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation

Common Causes of P2138 2007 Toyota Highlander

  1. Faulty throttle pedal position sensor
  2. Faulty throttle position sensor
  3. Wiring or connector issues
  4. ECM malfunction
  5. Corrosion or contamination in sensor connections

Symptoms of P2138 2007 Toyota Highlander

  1. Reduced engine power
  2. Rough idling or stalling
  3. Delayed throttle response
  4. Check Engine Light illuminated
  5. Limp mode activation

How to Fix P2138 2007 Toyota Highlander

  1. Begin by conducting a thorough inspection of the throttle pedal position sensor and throttle position sensor to check for any visible damage or corrosion.
  2. Test the sensors using a multimeter to measure the voltage output and compare it to the manufacturer's specifications.
  3. If the sensors are functioning within normal parameters, inspect the wiring harness and connectors for any signs of damage or poor connections.
  4. Clear the DTC and reset the ECM to see if the code returns after repairs have been made.
  5. If the issue persists, consider replacing the faulty sensors or addressing any underlying ECM issues.

Cost to Fix P2138 2007 Toyota Highlander

The cost of repairing a P2138 code on a 2007 Toyota Highlander can vary depending on the specific cause of the issue and the labor rates in your area. On average, the parts for this repair can range from $100 to $300, while labor costs can range from $100 to $200. Therefore, the total cost for this repair could be between $200 and $500. It is recommended to consult with a trusted mechanic or dealership to get a more accurate estimate based on your vehicle's specific needs. Keep in mind that labor rates can vary significantly based on location and the shop you choose for repairs.

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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 2007 Toyota Highlander Code

1. What are the common symptoms of OBDII code P2138 on a 2007 Toyota Highlander?

- Common symptoms include engine hesitation, lack of power, rough idling, and potential stalling while driving.

2. What does the Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation error code P2138 mean on a 2007 Toyota Highlander?

- This code indicates that there is a discrepancy between the voltage signals from the throttle position sensor and the pedal position sensor.

3. What are the possible causes of OBDII code P2138 on a 2007 Toyota Highlander?

- The potential causes include faulty throttle position sensor, malfunctioning pedal position sensor, wiring issues, or a problem with the electronic throttle control system.

4. Can driving with OBDII code P2138 on a 2007 Toyota Highlander cause further damage?

- Continuing to drive with this code can potentially lead to more serious issues like reduced engine performance, increased fuel consumption, and even safety concerns due to potential loss of throttle control.

5. How can I diagnose and repair OBDII code P2138 on my 2007 Toyota Highlander?

- Diagnosis typically involves testing the throttle and pedal position sensors, checking the wiring connections, and verifying the signals with a scan tool. Repair may involve replacing the faulty sensors, repairing wiring, or recalibrating the system.

6. Is it safe to continue driving my 2007 Toyota Highlander with the throttle position sensor error code P2138?

- It is not recommended to drive the vehicle with this code, as it can lead to unsafe driving conditions and potential loss of throttle response.

7. How much does it cost to fix OBDII code P2138 on a 2007 Toyota Highlander?

- The cost of repairing this code can vary depending on the exact cause of the issue, but it may range from a few hundred dollars to over a thousand dollars, including parts and labor.

8. Can I reset the OBDII code P2138 on my 2007 Toyota Highlander by disconnecting the battery?

- While disconnecting the battery may clear the code temporarily, it is important to address the root cause of the issue to prevent the code from reappearing.

9. Will OBDII code P2138 on a 2007 Toyota Highlander cause the check engine light to illuminate?

- Yes, this code typically triggers the check engine light to alert the driver of a potential issue with the throttle pedal position sensor/switch voltage correlation.

10. How can I prevent OBDII code P2138 from appearing on my 2007 Toyota Highlander in the future?

- Regularly maintaining and servicing the throttle control system, including cleaning sensors, checking wiring connections, and addressing any issues promptly, can help prevent the recurrence of this code.

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