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Engine-Codes – Toyota – P2135 2001 Toyota Highlander

P2135 2001 Toyota Highlander Code - Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation

Quick Answer

The P2135 diagnostic trouble code (DTC) for a 2001 Toyota Highlander indicates a problem with the Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation. Common causes include Faulty throttle position sensor, Malfunctioning accelerator pedal position sensor, Wiring or connector issues in the throttle system. 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 2001 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 or connector issues in the throttle system.
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 2001 Toyota Highlander Description

The P2135 diagnostic trouble code (DTC) for a 2001 Toyota Highlander indicates a problem with the Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation. This code is typically triggered when the Engine Control Module (ECM) detects that the voltage signals from the throttle position sensor (TPS) and the accelerator pedal position sensor (APPS) do not correlate with each other, indicating a potential issue with the throttle system.

OBDII Code P2135 2001 Toyota Highlander - Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation
P2135 2001 Toyota Highlander Code - Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation

Common Causes of P2135 2001 Toyota Highlander

  1. Faulty throttle position sensor
  2. Malfunctioning accelerator pedal position sensor
  3. Wiring or connector issues in the throttle system
  4. ECM software or hardware problems
  5. Throttle body malfunction

Symptoms of P2135 2001 Toyota Highlander

  1. Reduced engine power
  2. Unresponsive throttle
  3. Check Engine Light illuminated
  4. Engine stalling or hesitation
  5. Poor fuel efficiency

How to Fix P2135 2001 Toyota Highlander

  1. Begin by conducting a thorough inspection of the throttle position sensor, accelerator pedal position sensor, and related wiring for any visible damage or corrosion.
  2. Use a multimeter to test the voltage output of both sensors to determine if they are within the manufacturer's specified range.
  3. If either sensor is found to be faulty, replace it with a new, OEM-quality sensor.
  4. Check the wiring harness and connectors for any signs of wear or damage, repairing or replacing as necessary.
  5. Clear the DTC with a scan tool and perform a test drive to ensure the issue has been resolved.

Cost to Fix P2135 2001 Toyota Highlander

The cost of repairing a P2135 code on a 2001 Toyota Highlander can vary depending on the specific cause of the issue. In general, replacing a throttle position sensor or accelerator pedal position sensor can range from $100 to $300 each, including parts and labor. If wiring repairs or ECM reprogramming are required, additional costs may apply. It is recommended to consult with a qualified mechanic or dealership for a more accurate estimate based on your vehicle's specific needs and location. Keep in mind that labor rates can vary between different auto repair 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 P2135 2001 Toyota Highlander Code

1. What are the common symptoms of OBDII code P2135 in a 2001 Toyota Highlander?

The common symptoms include reduced engine power, hesitation or stalling when accelerating, and the vehicle going into "limp mode."

2. What does the OBDII code P2135 indicate in a 2001 Toyota Highlander?

Code P2135 indicates a Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation issue, meaning there is a discrepancy between the signals from the throttle position sensor and the pedal position sensor.

3. What are some possible causes of OBDII code P2135 in a 2001 Toyota Highlander?

Possible causes include a faulty throttle position sensor, pedal position sensor, wiring issues, poor electrical connections, or a problem with the electronic control module.

4. How can I diagnose the cause of OBDII code P2135 in my 2001 Toyota Highlander?

You can diagnose the issue by checking the throttle and pedal position sensor readings with a scan tool, inspecting the wiring and connectors for damage, and performing a thorough visual inspection of the sensors.

5. Can I still drive my 2001 Toyota Highlander with OBDII code P2135?

It is not recommended to drive the vehicle with code P2135 as it can lead to serious drivability issues and potentially unsafe driving conditions. It is best to address the problem promptly.

6. How can I repair OBDII code P2135 in my 2001 Toyota Highlander?

Repair options include replacing the faulty throttle or pedal position sensor, repairing any damaged wiring or connectors, and clearing the trouble codes with a scan tool.

7. Is it safe to reset the OBDII code P2135 in a 2001 Toyota Highlander without fixing the underlying issue?

Resetting the code without addressing the underlying problem may temporarily clear the warning light, but the issue will likely reoccur, leading to potential safety risks and continued drivability issues.

8. How much does it typically cost to repair OBDII code P2135 in a 2001 Toyota Highlander?

The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor, excluding any diagnostic fees.

9. Can a DIY enthusiast fix OBDII code P2135 in a 2001 Toyota Highlander?

Depending on your skill level and access to tools, you may be able to replace the throttle or pedal position sensor yourself. However, proper diagnosis and repair are crucial to ensure the issue is resolved correctly.

10. How often does OBDII code P2135 occur in a 2001 Toyota Highlander?

While code P2135 is not extremely common, it can still occur due to sensor failures or wiring issues in the throttle and pedal position system of the vehicle. Regular maintenance and inspections can help prevent such issues.

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