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Engine-Codes – Toyota – P2138 2003 Toyota Highlander

P2138 2003 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation

Quick Answer

The P2138 diagnostic trouble code (DTC) for a 2003 Toyota Highlander relates to the Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation. Common causes include Faulty throttle pedal position sensor, Faulty throttle position sensor 'D' or 'E', Wiring or connector issues in the throttle position sensor circuit. 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 2003 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 'D' or 'E', Wiring or connector issues in the throttle position sensor circuit.
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 13, 2024
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Code P2138 2003 Toyota Highlander Description

The P2138 diagnostic trouble code (DTC) for a 2003 Toyota Highlander relates to 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 throttle position sensor 'D' or 'E'. These sensors are crucial components of the vehicle's electronic throttle control system, which regulates the amount of air entering the engine to control acceleration.

OBDII Code P2138 2003 Toyota Highlander - Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation
P2138 2003 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation

Common Causes of P2138 2003 Toyota Highlander

  1. Faulty throttle pedal position sensor
  2. Faulty throttle position sensor 'D' or 'E'
  3. Wiring or connector issues in the throttle position sensor circuit
  4. Electronic Control Module (ECM) malfunction
  5. Corrosion or contamination in the sensor connectors

Symptoms of P2138 2003 Toyota Highlander

  1. Reduced engine power
  2. Hesitation or stalling during acceleration
  3. Rough idling
  4. Check Engine Light illumination
  5. Limp mode activation

How to Fix P2138 2003 Toyota Highlander

  1. Begin by conducting a thorough inspection of the throttle pedal position sensor, throttle position sensor 'D' and 'E', as well as their wiring and connectors.
  2. Test the sensors using a multimeter to check for proper voltage signals according to manufacturer specifications.
  3. Replace any faulty sensors or repair any damaged wiring or connectors.
  4. Clear the DTC from the ECM memory using a scan tool and perform a road test to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to pinpoint the exact cause, such as testing the ECM or checking for signal interference.

Cost to Fix P2138 2003 Toyota Highlander

The cost of repairing a P2138 code on a 2003 Toyota Highlander can vary depending on the specific cause of the issue. Typically, replacing a throttle pedal position sensor or throttle position sensor can range from $100 to $300 per sensor, not including labor costs. Wiring repairs or ECM replacement can increase the overall repair cost. In total, the repair for this issue could range from $200 to $800, including parts and labor. It's important to note that labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

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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 2003 Toyota Highlander Code

1. What are the common symptoms of OBDII code P2138 in a 2003 Toyota Highlander?

- Common symptoms include rough idle, lack of power, hesitation or stalling while driving, and an illuminated Check Engine light.

2. What does the OBDII code P2138 in a 2003 Toyota Highlander indicate?

- The code P2138 indicates a problem with the Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation.

3. What are the possible causes of OBDII code P2138 in a 2003 Toyota Highlander?

- Possible causes include a faulty throttle pedal position sensor, issues with the throttle body, wiring or connection problems, or a malfunction in the engine control module.

4. How can I diagnose the cause of OBDII code P2138 in my 2003 Toyota Highlander?

- Diagnosing the issue may involve inspecting the throttle pedal sensor and wiring connections, testing the throttle body for proper operation, and using a scan tool to check for any related trouble codes.

5. Can I drive my 2003 Toyota Highlander with OBDII code P2138?

- It is not recommended to drive the vehicle with code P2138 as it can lead to performance issues and potential safety hazards. It's best to address the problem promptly.

6. How can I repair OBDII code P2138 in my 2003 Toyota Highlander?

- Repair options may include replacing the throttle pedal position sensor, repairing any wiring issues, cleaning or replacing the throttle body, or reprogramming the engine control module.

7. Is it possible to reset OBDII code P2138 in a 2003 Toyota Highlander without fixing the underlying issue?

- Resetting the code without addressing the root cause is not recommended, as the issue will likely reoccur. It's important to diagnose and repair the problem properly.

8. How much does it cost to fix OBDII code P2138 in a 2003 Toyota Highlander?

- The cost of fixing code P2138 can vary depending on the specific cause of the issue. Costs may include parts and labor for sensor replacement, wiring repairs, or other necessary repairs.

9. Can a DIY enthusiast fix OBDII code P2138 in a 2003 Toyota Highlander?

- Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address code P2138 by following repair guides and using diagnostic equipment.

10. How long does it take to repair OBDII code P2138 in a 2003 Toyota Highlander?

- The repair time can vary based on the cause of the issue and the complexity of the repair. It may take anywhere from a few hours to a full day to address code P2138 effectively.

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