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Engine-Codes – Toyota – P2135 2003 Toyota Highlander

P2135 2003 Toyota Highlander Code - Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation

Quick Answer

The P2135 diagnostic trouble code (DTC) for a 2003 Toyota Highlander indicates a Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation issue. Common causes include Faulty throttle position sensor, Malfunctioning accelerator pedal position sensor, Wiring harness issues such as corrosion or damage. 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 2003 Toyota Highlander indicates Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation.
Common causes
Common causes include Faulty throttle position sensor, Malfunctioning accelerator pedal position sensor, Wiring harness issues such as corrosion or damage.
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 17, 2024
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Code P2135 2003 Toyota Highlander Description

The P2135 diagnostic trouble code (DTC) for a 2003 Toyota Highlander indicates a Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation issue. This code specifically points to a problem with the correlation between the throttle position sensor (TPS) and the accelerator pedal position sensor (APPS) in the vehicle. The TPS is responsible for monitoring the position of the throttle valve, while the APPS detects the position of the accelerator pedal. The correlation between these two sensors is crucial for the proper operation of the electronic throttle control system.

OBDII Code P2135 2003 Toyota Highlander - Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation
P2135 2003 Toyota Highlander Code - Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation

Common Causes of P2135 2003 Toyota Highlander

  1. Faulty throttle position sensor.
  2. Malfunctioning accelerator pedal position sensor.
  3. Wiring harness issues such as corrosion or damage.
  4. Loose or poor connections between sensors and ECM.
  5. ECM software or hardware problems.

Symptoms of P2135 2003 Toyota Highlander

  1. Engine hesitation or lack of response when pressing the accelerator pedal.
  2. Rough idling or stalling when coming to a stop.
  3. Reduced fuel efficiency and overall performance.
  4. Illumination of the Check Engine Light on the dashboard.

How to Fix P2135 2003 Toyota Highlander

  1. Begin by diagnosing the specific cause of the P2135 code using a diagnostic scanner to pinpoint the faulty sensor or wiring issue.
  2. Inspect the throttle position sensor and accelerator pedal position sensor for any signs of wear, damage, or malfunction.
  3. Check the wiring harness for any corrosion, fraying, or loose connections that may be affecting the signal between the sensors and ECM.
  4. Replace any faulty sensors or repair wiring issues as needed to restore proper voltage correlation between the TPS and APPS.
  5. Clear the DTC and perform a test drive to ensure that the issue has been resolved and that the Check Engine Light does not reappear.

Cost to Fix P2135 2003 Toyota Highlander

The typical repair costs for addressing a P2135 code on a 2003 Toyota Highlander can range from $200 to $500, including parts and labor. However, it's important to note that the 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 charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships, while independent shops often charge less. It's recommended to check local rates 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 P2135 2003 Toyota Highlander Code

1. What does OBDII code P2135 for a 2003 Toyota Highlander indicate?

The code P2135 indicates a Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation issue in the vehicle.

2. What are some common symptoms of a P2135 fault in a 2003 Toyota Highlander?

Common symptoms of a P2135 fault may include reduced engine power, hesitation or stalling when accelerating, and the vehicle going into "limp mode."

3. What are some possible causes of the P2135 code in a 2003 Toyota Highlander?

Possible causes of the P2135 code include a faulty throttle position sensor, a faulty pedal position sensor, damaged wiring or connectors, or issues with the electronic throttle control system.

4. How can I diagnose the cause of the P2135 code in my 2003 Toyota Highlander?

Diagnosing the P2135 code may involve using a scan tool to check for related codes, testing the throttle position sensor and pedal position sensor with a multimeter, and inspecting the wiring and connectors for any damage.

5. Can I still drive my 2003 Toyota Highlander with the P2135 code present?

It is not recommended to drive your vehicle with the P2135 code present, as it can lead to unsafe driving conditions and potential further damage to the vehicle.

6. How can I repair a P2135 fault in my 2003 Toyota Highlander?

Repairing a P2135 fault may involve replacing the faulty throttle position sensor, pedal position sensor, or repairing any damaged wiring or connectors related to the throttle control system.

7. Are there any DIY tips for fixing a P2135 fault in a 2003 Toyota Highlander?

While some may attempt to replace the sensors themselves, it is recommended to have a professional diagnose and repair the issue to ensure proper functioning of the throttle control system.

8. How much does it typically cost to fix a P2135 fault in a 2003 Toyota Highlander?

The cost of fixing a P2135 fault can vary depending on the cause of the issue, but it may range from a few hundred to a thousand dollars for parts and labor.

9. Will resetting the OBDII system clear the P2135 code in my 2003 Toyota Highlander?

Resetting the OBDII system may temporarily remove the code, but it is important to address the underlying issue causing the fault to prevent the code from returning.

10. Can a P2135 fault in a 2003 Toyota Highlander cause long-term damage if left unrepaired?

Leaving a P2135 fault unrepaired can potentially cause long-term damage to the engine and other components of the vehicle, so it is important to address the issue promptly.

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