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Engine-Codes – Toyota – P0120 2004 Toyota Highlander

P0120 2004 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction

Quick Answer

The P0120 code for a 2004 Toyota Highlander indicates a Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction. Common causes include Faulty throttle pedal position sensor or switch, Damaged wiring or connectors in the circuit, Corrosion or debris affecting sensor operation. 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 2004 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 or connectors in the circuit, Corrosion or debris affecting sensor operation.
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 2004 Toyota Highlander Description

The P0120 code for a 2004 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 monitors the position of the throttle pedal in relation to the engine's throttle. The throttle pedal position sensor is a crucial component of the vehicle's electronic throttle control system, as it communicates the driver's input to the engine control module, which then adjusts the throttle opening accordingly.

OBDII Code P0120 2004 Toyota Highlander - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction
P0120 2004 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction

Common Causes of P0120 2004 Toyota Highlander

  1. Faulty throttle pedal position sensor or switch
  2. Damaged wiring or connectors in the circuit
  3. Corrosion or debris affecting sensor operation
  4. Engine control module malfunction
  5. Environmental factors such as extreme temperatures affecting sensor performance

Symptoms of P0120 2004 Toyota Highlander

  1. Engine hesitation or lack of response when accelerating
  2. Rough idling or stalling
  3. Reduced engine power
  4. Check Engine Light illuminated on the dashboard
  5. Difficulty maintaining a steady speed while driving

How to Fix P0120 2004 Toyota Highlander

  1. Diagnose the specific cause by using a scan tool to read the fault codes and perform a thorough inspection of the throttle pedal position sensor and related components.
  2. Replace the faulty throttle pedal position sensor or switch if necessary.
  3. Inspect and repair any damaged wiring or connectors in the circuit.
  4. Clear the fault codes and reset the engine control module.
  5. Test drive the vehicle to ensure the issue has been resolved and the symptoms have been eliminated.

Cost to Fix P0120 2004 Toyota Highlander

The typical repair costs for a Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction in a 2004 Toyota Highlander can range from $150 to $400, including parts and labor. However, 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. Auto repair shops commonly charge between $80 and $150 per hour, with rates potentially higher in metropolitan areas or at dealerships, and lower at independent shops. It is advisable to check local rates for a more precise estimate before proceeding with the repair.

What does this mean?

Tech Notes for P0120 2004 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.

Need more information about the P0120 2004 Toyota Highlander code?

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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 2004 Toyota Highlander Code

1. What are the common symptoms of OBDII code P0120 in a 2004 Toyota Highlander?

The common symptoms of OBDII code P0120 in a 2004 Toyota Highlander include unresponsive throttle, erratic engine performance, and potential stalling.

2. What causes the Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction in a 2004 Toyota Highlander?

The P0120 code in a 2004 Toyota Highlander is typically caused by a faulty throttle position sensor, damaged wiring, or a poor connection in the throttle pedal position sensor circuit.

3. How can I diagnose the cause of OBDII code P0120 in my 2004 Toyota Highlander?

To diagnose the cause of the P0120 code, you can use a scan tool to check for other related trouble codes, visually inspect the throttle position sensor and its wiring, and perform electrical tests to pinpoint the issue.

4. Can I drive my 2004 Toyota Highlander with OBDII code P0120?

It is not recommended to drive your 2004 Toyota Highlander with the P0120 code as it can lead to unsafe driving conditions due to potential throttle issues and engine performance problems.

5. How can I repair OBDII code P0120 in a 2004 Toyota Highlander?

Repairing the P0120 code in a 2004 Toyota Highlander involves replacing the throttle position sensor, repairing any damaged wiring, and ensuring a secure connection in the throttle pedal position sensor circuit.

6. Are there any DIY tips for fixing OBDII code P0120 in a 2004 Toyota Highlander?

While it is possible to replace the throttle position sensor yourself, it is recommended to have a professional mechanic diagnose and repair the P0120 code to ensure proper installation and calibration.

7. Will resetting the OBDII code P0120 in my 2004 Toyota Highlander make it go away permanently?

Simply resetting the P0120 code may temporarily clear the check engine light, but if the underlying issue causing the code is not fixed, the code is likely to return after driving the vehicle.

8. Is the Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction a common issue in 2004 Toyota Highlanders?

The P0120 code related to the throttle pedal position sensor circuit malfunction is a known issue in some 2004 Toyota Highlanders, especially as the vehicle ages and the sensor may wear out.

9. Can a dirty throttle body cause OBDII code P0120 in a 2004 Toyota Highlander?

While a dirty throttle body can cause related performance issues, the P0120 code itself is usually directly related to a malfunction in the throttle pedal position sensor circuit rather than the throttle body.

10. How much does it cost to repair OBDII code P0120 in a 2004 Toyota Highlander?

The cost of repairing the P0120 code in a 2004 Toyota Highlander can vary depending on the exact cause of the issue, but it typically ranges from $150 to $300 for parts and labor.

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