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Engine-Codes – Saab – P2138 Saab

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

Quick Answer

The P2138 diagnostic trouble code (DTC) for Saab vehicles indicates an issue with the throttle/pedal position sensor/switch 'D'/'E' voltage correlation. Common causes include Faulty throttle position sensor, Faulty accelerator pedal 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 Saab indicates Throttle/Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation.
Common causes
Common causes include Faulty throttle position sensor, Faulty accelerator pedal 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 09, 2024
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Code P2138 Saab Description

The P2138 diagnostic trouble code (DTC) for Saab vehicles indicates an issue with the throttle/pedal position sensor/switch 'D'/'E' voltage correlation. This code is triggered when the Engine Control Module (ECM) detects a discrepancy between the voltage signals from the throttle position sensor and the accelerator pedal position sensor.

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

Common Causes of P2138 Saab

  1. Faulty throttle position sensor
  2. Faulty accelerator pedal position sensor
  3. Wiring or connector issues
  4. ECM software malfunction
  5. Throttle body or pedal assembly malfunction

Symptoms of P2138 Saab

  1. Lack of power or acceleration
  2. Rough idling or engine misfires
  3. Hesitation or surging during acceleration
  4. Stalling or difficulty starting the engine

How to Fix P2138 Saab

  1. Diagnose the issue by using a diagnostic scan tool to read the code and check the sensor voltages.
  2. Inspect the throttle and pedal position sensors for any signs of damage or wear.
  3. Check the wiring harness and connectors for any loose connections or corrosion.
  4. Replace the faulty sensor or sensors, as well as any damaged wiring or connectors.
  5. Clear the DTC and perform a test drive to ensure the issue has been resolved.

Cost to Fix P2138 Saab

The cost of repairing the P2138 code on a Saab vehicle can vary depending on the specific cause of the issue and the labor rates in your area. Typically, replacing a throttle position sensor or accelerator pedal position sensor can range from $100 to $300 each, including parts and labor. If additional wiring repairs or ECM reprogramming are necessary, the cost may increase accordingly. It's recommended to consult with a trusted mechanic or auto repair shop for a more accurate estimate based on your vehicle's make and model.

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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 Saab Code

1. What are the common symptoms of OBDII code P2138 in a Saab related to the Throttle/Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation?

- Common symptoms include reduced engine power, hesitation or stalling when accelerating, and illuminated check engine light.

2. What are the possible causes of OBDII code P2138 in a Saab?

- The code P2138 in a Saab is typically caused by a faulty throttle position sensor, pedal position sensor, wiring issues, or a problem with the electronic throttle control system.

3. How can I diagnose the Throttle/Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation issue in my Saab?

- Diagnosing P2138 involves using a scan tool to retrieve the trouble codes, checking the throttle and pedal position sensor voltages, and inspecting the wiring for any signs of damage or corrosion.

4. Can I drive my Saab with OBDII code P2138?

- It is not recommended to drive your Saab with code P2138 as it can lead to unsafe driving conditions and potential engine damage. It is best to have the issue diagnosed and repaired as soon as possible.

5. How can I repair OBDII code P2138 in my Saab?

- Repairing P2138 may involve replacing the faulty throttle position sensor, pedal position sensor, or repairing any damaged wiring. It is advisable to consult a professional mechanic for accurate diagnosis and repair.

6. Are there any preventive maintenance tips to avoid OBDII code P2138 in my Saab?

- To prevent code P2138, it is important to regularly inspect and maintain the throttle and pedal position sensors, as well as the electronic throttle control system. Keeping up with routine maintenance can help prevent this issue.

7. Is OBDII code P2138 a common problem in Saab vehicles?

- While not extremely common, OBDII code P2138 related to the Throttle/Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation can occur in Saab vehicles, especially in older models or vehicles with high mileage.

8. Can a DIY enthusiast fix OBDII code P2138 in a Saab?

- While some DIY enthusiasts may have the skills to diagnose and repair code P2138, it is recommended to seek professional help for accurate diagnosis and proper repair to ensure the issue is resolved effectively.

9. Will resetting the check engine light resolve OBDII code P2138 in my Saab?

- Simply resetting the check engine light will not fix the underlying issue causing code P2138. It is important to diagnose the problem, address the root cause, and clear the code properly to prevent it from reoccurring.

10. How much does it typically cost to repair OBDII code P2138 in a Saab?

- The cost of repairing code P2138 in a Saab can vary depending on the specific cause of the issue, the parts needed for repair, and labor costs. It is advisable to obtain quotes from different mechanics or repair shops for an accurate estimate.

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