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Engine-Codes – Toyota – P0120 2003 Toyota Highlander

P0120 2003 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction

Quick Answer

The P0120 code on a 2003 Toyota Highlander indicates a Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction. Common causes include Faulty throttle pedal position sensor or switch, Damaged wiring harness or connector, Corrosion due to moisture intrusion. 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
P0120 2003 Toyota Highlander indicates Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction.
Common causes
Common causes include Faulty throttle pedal position sensor or switch, Damaged wiring harness or connector, Corrosion due to moisture intrusion.
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 11, 2024
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Code P0120 2003 Toyota Highlander Description

The P0120 code on a 2003 Toyota Highlander indicates a Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction. This means that there is an issue with the sensor or switch that detects the position of the throttle pedal in the vehicle. The throttle pedal position sensor is a crucial component of the vehicle's electronic throttle control system, which regulates the amount of air entering the engine. This information is used by the engine control module (ECM) to determine how much fuel to inject into the engine for optimal performance.

OBDII Code P0120 2003 Toyota Highlander - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction
P0120 2003 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction

Common Causes of P0120 2003 Toyota Highlander

  1. Faulty throttle pedal position sensor or switch
  2. Damaged wiring harness or connector
  3. Corrosion due to moisture intrusion
  4. Electronic control module (ECM) issue
  5. Poor electrical connection

Symptoms of P0120 2003 Toyota Highlander

  1. Rough idling
  2. Hesitation or stalling when accelerating
  3. Poor fuel efficiency
  4. Lack of power while driving
  5. Illumination of the check engine light

How to Fix P0120 2003 Toyota Highlander

  1. Use an OBD-II scanner to confirm the P0120 code and diagnose the issue.
  2. Inspect the throttle pedal position sensor and switch for any visible damage or wear.
  3. Check the wiring harness and connector for any signs of damage or corrosion.
  4. Repair or replace the faulty throttle pedal position sensor or switch.
  5. Clear the code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0120 2003 Toyota Highlander

The typical repair costs for addressing a Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction can range from $150 to $400, including parts and labor. However, 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. It is advisable to check local rates for a more accurate estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.

What does this mean?

Tech Notes for P0120 2003 Toyota Highlander

Very common problem with Toyota models. Before replacing any parts, try cleaning the throttle body and reset the light. If the codes come back, then it will necessary to replaced the throttle position sensor (TPS). Most auto parts sell the TPS for around $60.

When is the Code Detected?

Malfunction is detected when an excessively low or high voltage from the sensor is sent to ECM.

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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 P0120 2003 Toyota Highlander Code

1. What are the common symptoms of OBDII code P0120 in a 2003 Toyota Highlander?

- Common symptoms include issues with acceleration, rough idling, stalling, and a decrease in fuel efficiency.

2. What does the OBDII code P0120 for a 2003 Toyota Highlander indicate?

- The code P0120 indicates a malfunction in the throttle pedal position sensor/switch 'A' circuit.

3. What are the possible causes of the throttle pedal position sensor/switch 'A' circuit malfunction in a 2003 Toyota Highlander?

- Possible causes include a faulty throttle position sensor, damaged wiring or connectors, or a problem with the throttle body.

4. How can I diagnose the cause of OBDII code P0120 in my 2003 Toyota Highlander?

- Diagnose the issue by checking the throttle position sensor's wiring and connectors, testing the sensor's resistance, and inspecting the throttle body for any damage.

5. Can I drive my 2003 Toyota Highlander with OBDII code P0120?

- It is not recommended to drive the vehicle with code P0120 as it can lead to performance issues and potential safety hazards.

6. How can I repair OBDII code P0120 in my 2003 Toyota Highlander?

- Repair options include replacing the throttle position sensor, repairing or replacing damaged wiring, or cleaning and inspecting the throttle body.

7. Will resetting the OBDII code P0120 in my 2003 Toyota Highlander make the issue go away?

- Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing the malfunction.

8. Is it possible to prevent OBDII code P0120 from occurring in my 2003 Toyota Highlander?

- Regular maintenance, such as keeping the throttle body clean and checking for wiring damage, can help prevent the occurrence of code P0120.

9. How much does it typically cost to repair OBDII code P0120 in a 2003 Toyota Highlander?

- The cost of repairs can vary depending on the specific cause of the issue, but it may range from $100 to $300 for parts and labor.

10. Can a DIY enthusiast fix OBDII code P0120 in a 2003 Toyota Highlander?

- Depending on your skill level and access to tools, some DIY enthusiasts may be able to address the issue by replacing the throttle position sensor or checking and repairing wiring themselves.

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