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P2135 Subaru Code - Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation

Quick Answer

The P2135 diagnostic trouble code (DTC) in a Subaru indicates a problem with the Throttle/Pedal Position Sensor/Switch 'A'/'B' voltage correlation. Common causes include Faulty throttle position sensor, Faulty accelerator pedal position sensor, Wiring or connector issues in the 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
P2135 Subaru indicates Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation.
Common causes
Common causes include Faulty throttle position sensor, Faulty accelerator pedal position sensor, Wiring or connector issues in the 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 06, 2024
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Code P2135 Subaru Description

The P2135 diagnostic trouble code (DTC) in a Subaru indicates a problem with the Throttle/Pedal Position Sensor/Switch 'A'/'B' voltage correlation. This means that the voltage signals from the throttle position sensor and the accelerator pedal position sensor do not align as they should, affecting the vehicle's ability to accurately control the throttle and fuel injection. The throttle position sensor measures the actual position of the throttle plate, while the accelerator pedal position sensor detects how much the driver is pressing on the gas pedal. When these signals do not correlate properly, it can lead to issues with engine performance, fuel efficiency, and overall drivability.

OBDII Code P2135 Subaru - Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation
P2135 Subaru Code - Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation

Common Causes of P2135 Subaru

  1. Faulty throttle position sensor
  2. Faulty accelerator pedal position sensor
  3. Wiring or connector issues in the sensor circuit
  4. Corrosion or contamination in sensor connections
  5. Electronic control module (ECM) software related issues

Symptoms of P2135 Subaru

  1. Reduced engine power or acceleration
  2. Stalling or hesitation when accelerating
  3. Poor fuel efficiency
  4. Check Engine Light illuminated
  5. Vehicle going into limp mode (limited performance to prevent further damage)

How to Fix P2135 Subaru

  1. Diagnose the issue by using a scan tool to retrieve the trouble codes and perform a thorough inspection of the throttle and pedal position sensors.
  2. Test the throttle and pedal position sensors for proper voltage and resistance readings.
  3. Replace any faulty sensors or repair any damaged wiring or connectors.
  4. Clear the trouble codes and perform a test drive to ensure the issue has been resolved.
  5. If necessary, reprogram the ECM to ensure proper communication between the sensors and the engine control module.

Cost to Fix P2135 Subaru

The cost of repairing a P2135 code in a Subaru can vary depending on the extent of the issue and the specific parts and labor required. On average, the cost of replacing a throttle position sensor or accelerator pedal position sensor can range from $100 to $300 each, while the cost of labor can range from $80 to $150 per hour. Overall, the total repair cost for this issue could range from $200 to $600 or more, depending on the specific circumstances. It is recommended to consult with a professional mechanic to get an 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 P2135 Subaru Code

1. What are the common symptoms of OBDII code P2135 in a Subaru related to the Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation?

- Common symptoms include rough idling, stalling, lack of power, and the vehicle going into "limp mode" where it operates at reduced performance.

2. What are the possible causes of OBDII code P2135 in a Subaru?

- The code P2135 can be triggered by issues such as a faulty throttle position sensor, pedal position sensor, wiring problems, or a malfunctioning electronic throttle control system.

3. How can I diagnose the Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation issue in a Subaru?

- Diagnosing this problem typically involves using a scan tool to read the OBDII code, checking the sensor readings with a multimeter, and inspecting the wiring for any signs of damage or corrosion.

4. Can I drive my Subaru with OBDII code P2135 present?

- It is not recommended to drive your Subaru with code P2135 present, as the symptoms associated with this issue can affect the vehicle's performance and safety. It is best to address the problem promptly.

5. How can I repair OBDII code P2135 in my Subaru?

- Repairing code P2135 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 an accurate diagnosis and repair.

6. Is it necessary to reset the OBDII code P2135 in a Subaru after repairing the issue?

- Yes, it is recommended to clear the OBDII code P2135 after repairing the underlying problem. This can be done using a scan tool or by disconnecting the car's battery for a few minutes.

7. Can a dirty throttle body cause OBDII code P2135 in a Subaru?

- While a dirty throttle body can lead to performance issues, it is not a common cause of code P2135. It is essential to focus on checking the throttle and pedal position sensors first.

8. How much does it cost to repair OBDII code P2135 in a Subaru?

- The cost of repairing code P2135 can vary depending on the root cause of the issue, the parts needed, and labor costs. It is recommended to obtain estimates from different repair shops.

9. Will OBDII code P2135 cause permanent damage to my Subaru if left unaddressed?

- Ignoring OBDII code P2135 can potentially cause further damage to the throttle control system and affect the vehicle's drivability. It is advisable to address the issue promptly to prevent any long-term damage.

10. Can I prevent OBDII code P2135 in my Subaru?

- To prevent code P2135, it is essential to perform regular maintenance on your Subaru, including checking and cleaning throttle components, inspecting wiring for damage, and addressing any issues promptly to prevent them from escalating.

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