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Engine-Codes – Toyota – P2138 Toyota

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

Quick Answer

The P2138 diagnostic trouble code (DTC) for Toyota vehicles indicates a problem with the throttle pedal position sensor/switch 'D'/'E' voltage correlation. Common causes include Faulty throttle pedal position sensors 'D' or 'E', Wiring harness issues, such as shorts or open circuits, Corrosion or poor connections in the sensor wiring. 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 Toyota indicates Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation.
Common causes
Common causes include Faulty throttle pedal position sensors 'D' or 'E', Wiring harness issues, such as shorts or open circuits, Corrosion or poor connections in the sensor wiring.
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 09, 2024
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Code P2138 Toyota Description

The P2138 diagnostic trouble code (DTC) for Toyota vehicles indicates a problem with the throttle pedal position sensor/switch 'D'/'E' voltage correlation. This code specifically means that there is a discrepancy between the voltage signals being sent by these sensors, which can lead to issues with the vehicle's electronic throttle control system. The throttle pedal position sensor is responsible for communicating the position of the accelerator pedal to the engine control module (ECM), which then adjusts the throttle opening accordingly.

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

Common Causes of P2138 Toyota

  1. Faulty throttle pedal position sensors 'D' or 'E'
  2. Wiring harness issues, such as shorts or open circuits
  3. Corrosion or poor connections in the sensor wiring
  4. ECM software or hardware issues
  5. Environmental factors, such as water intrusion or debris in the sensor connectors

Symptoms of P2138 Toyota

  1. Check engine light illuminated on the dashboard
  2. Limp mode activated, reducing engine power
  3. Erratic throttle response
  4. Stalling or hesitation during acceleration
  5. Reduced fuel efficiency

How to Fix P2138 Toyota

  1. Diagnose the issue by using a scan tool to read the P2138 code and checking the throttle pedal position sensor readings.
  2. Inspect the wiring harness for any visible damage or corrosion, and repair or replace as needed.
  3. Test the throttle pedal position sensors for proper voltage output and replace if found to be faulty.
  4. Clear the code from the ECM memory and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnosis may be required to pinpoint the exact cause, such as checking the ECM for any software or hardware issues.

Cost to Fix P2138 Toyota

The typical repair costs for addressing the P2138 code on a Toyota vehicle can range from $200 to $500, including parts and labor. However, it's essential to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Most auto repair shops commonly charge between $80 and $150 per hour, but rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. It's recommended to check local rates for a more precise estimate.

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Information for Specific Toyota Models

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 Toyota Code

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

- Common symptoms include reduced engine power, hesitation or stalling when accelerating, and illuminated Check Engine Light.

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

- The code P2138 indicates an issue with the correlation between the voltage signals of the throttle pedal position sensor and throttle position sensor.

3. What are some possible causes of OBDII code P2138 in a Toyota?

- Possible causes include a faulty throttle pedal position sensor, malfunctioning throttle position sensor, wiring issues, or a problem with the engine control module.

4. Can a dirty throttle body cause OBDII code P2138 in a Toyota?

- Yes, a dirty throttle body can disrupt the proper functioning of the throttle control system and potentially trigger code P2138. Cleaning the throttle body may help resolve the issue.

5. How can I diagnose and repair OBDII code P2138 in my Toyota?

- Diagnosis involves checking the throttle pedal position sensor, throttle position sensor, and their wiring for faults. Repair may involve replacing the faulty sensors or repairing/replacing damaged wiring.

6. Is it safe to drive with OBDII code P2138 in a Toyota?

- It is not recommended to drive with code P2138 as it can cause performance issues and potentially lead to dangerous driving conditions. It is best to address the issue promptly.

7. Can resetting the ECU clear OBDII code P2138 in a Toyota?

- Resetting the ECU may temporarily clear the code, but if the underlying issue causing P2138 is not addressed, the code is likely to reappear once the system detects the problem again.

8. How much does it typically cost to repair OBDII code P2138 in a Toyota?

- The cost of repairing code P2138 can vary depending on the specific cause of the issue. Costs may include sensor replacement, wiring repairs, or potential labor charges.

9. Are there any DIY fixes for OBDII code P2138 in a Toyota?

- DIY fixes for P2138 may include cleaning the throttle body, checking and tightening electrical connections, or visually inspecting the sensors for any obvious damage before seeking professional help.

10. Can OBDII code P2138 cause permanent damage to the vehicle if left unaddressed?

- Continuing to drive with code P2138 can potentially cause further damage to the engine or other components of the throttle control system. It is important to address the issue promptly to prevent any long-term damage.

Discuss the causes and fixes for P2138 Toyota OBDII Code

Submit a New Comment

  • 03 toyota tundra 4,7 i step on the gas pedal and the truck wont respond my accelerator wont respond can some one help me please

    Reply to Comment

  • The Accelerator Pedal Position (APP) Sensor may have to be replace to fix the problem.

    Reply to Comment