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Engine-Codes – Scion – P2138 Scion

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

Quick Answer

The P2138 code for Scion indicates a problem with the Throttle Pedal Position Sensor/Switch 'D'/'E' voltage correlation. Common causes include Faulty throttle pedal position sensor, Damaged wiring or connectors associated with the sensor, Issues with the ECM. 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 Scion indicates Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation.
Common causes
Common causes include Faulty throttle pedal position sensor, Damaged wiring or connectors associated with the sensor, Issues with the ECM.
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 Scion Description

The P2138 code for Scion indicates a problem with the Throttle Pedal Position Sensor/Switch 'D'/'E' voltage correlation. This means that there is a discrepancy between the voltage signals being sent by the throttle pedal position sensor and switch 'D' and 'E'. The throttle pedal position sensor is responsible for sending signals to the engine control module (ECM) to determine how much fuel and air should be delivered to the engine based on the driver's input.

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

Common Causes of P2138 Scion

  1. Faulty throttle pedal position sensor.
  2. Damaged wiring or connectors associated with the sensor.
  3. Issues with the ECM.
  4. Corrosion or debris affecting the sensor's functionality.
  5. Electronic interference or voltage fluctuations.

Symptoms of P2138 Scion

  1. Poor acceleration or hesitation when pressing the gas pedal.
  2. Engine stalling or rough idling.
  3. Check Engine Light illuminated on the dashboard.
  4. Decreased fuel efficiency.
  5. Complete inability to start the engine.

How to Fix P2138 Scion

  1. Perform a thorough diagnostic scan to confirm the P2138 code and identify the root cause of the issue.
  2. Inspect the throttle pedal position sensor, wiring, and connectors for any signs of damage or corrosion.
  3. Replace the throttle pedal position sensor if it is found to be faulty.
  4. Clear the code from the ECM's memory and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnosis may be required to check for any underlying issues with the ECM or other components.

Cost to Fix P2138 Scion

The typical repair costs for addressing the P2138 code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. In general, replacing the throttle pedal position sensor can cost between $150 and $300, including parts and labor. Additional diagnostic testing or repairs may incur extra costs. It's recommended to check with local auto repair shops for a more accurate estimate based on the vehicle's make and model. Labor rates can range from $80 to $150 per hour, with higher rates in metropolitan areas or at dealerships and lower rates at independent shops.

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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 Scion Code

1. What are the common symptoms of OBDII code P2138 in a Scion related to the throttle pedal position sensor/switch?

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

2. What are the potential causes of the OBDII code P2138 in a Scion?

- The code P2138 is often triggered by a faulty throttle pedal position sensor/switch, wiring issues, or problems with the throttle body.

3. How can I diagnose the throttle pedal position sensor/switch issue causing OBDII code P2138 in my Scion?

- To diagnose the issue, you can use a scan tool to check for the P2138 code, inspect the throttle pedal sensor wiring, and perform a throttle body inspection for any signs of wear or damage.

4. Can I drive my Scion with the OBDII code P2138 present?

- It is not recommended to drive your Scion with the P2138 code present, as it can lead to safety hazards and further damage to the vehicle if not addressed promptly.

5. How can I repair the throttle pedal position sensor/switch issue causing OBDII code P2138 in my Scion?

- The repair may involve replacing the throttle pedal position sensor/switch, repairing any damaged wiring, or cleaning/replacing the throttle body if necessary.

6. Will resetting the OBDII code P2138 in my Scion make the issue go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue with the throttle pedal position sensor/switch is not fixed, the code is likely to reappear.

7. Is it possible to prevent the OBDII code P2138 in a Scion related to the throttle pedal position sensor/switch?

- Regular maintenance, such as cleaning the throttle body and ensuring proper wiring connections, can help prevent issues that may trigger the P2138 code.

8. Can a DIY enthusiast repair the OBDII code P2138 related to the throttle pedal position sensor/switch in a Scion?

- Depending on your experience and tools available, some DIY enthusiasts may be able to replace the throttle pedal position sensor/switch themselves. However, proper diagnosis is crucial.

9. How much does it typically cost to repair the throttle pedal position sensor/switch issue causing OBDII code P2138 in a Scion?

- The cost of repair can vary depending on the extent of the issue and whether you choose to do the repair yourself or take it to a mechanic. Costs may range from $100 to $400 or more.

10. Can a malfunctioning throttle pedal position sensor/switch causing OBDII code P2138 impact the fuel efficiency of my Scion?

- Yes, a faulty throttle pedal position sensor/switch can lead to inefficient fuel consumption due to improper air-fuel mixture control, potentially affecting the vehicle's fuel efficiency.

Discuss the causes and fixes for P2138 Scion OBDII Code

Submit a New Comment

  • I had problems with idling and shaking and vibration. Took to Auto zone and error was p2138. What could it be? 2103 Scion frs automatic

    Reply to Comment

  • The P2138 code is for the Throttle Pedal Position Sensor, but that sensor usually wont cause an idling problem. Either you got the wrong code or the problem with the idle is not triggering any codes.

    Reply to Comment