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Engine-Codes – Toyota – P0120 Toyota

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

Quick Answer

The P0120 code for Toyota vehicles indicates a Throttle/Pedal Position Sensor/Switch 'A' Circuit Malfunction. Common causes include Faulty throttle position sensor, Damaged or corroded wiring in the sensor circuit, Loose or disconnected connectors 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
P0120 Toyota indicates Throttle / Pedal Position Sensor / Switch 'A' Circuit Malfunction.
Common causes
Common causes include Faulty throttle position sensor, Damaged or corroded wiring in the sensor circuit, Loose or disconnected connectors 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 07, 2024
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Code P0120 Toyota Description

The P0120 code for Toyota vehicles indicates a Throttle/Pedal Position Sensor/Switch 'A' Circuit Malfunction. This means that the Engine Control Module (ECM) has detected an issue with the circuit that controls the throttle or pedal position sensor/switch. The throttle position sensor (TPS) is responsible for sending signals to the ECM regarding the position of the throttle valve, which in turn helps the engine management system determine how much air and fuel should be delivered to the engine for optimal performance.

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

Common Causes of P0120 Toyota

  1. Faulty throttle position sensor.
  2. Damaged or corroded wiring in the sensor circuit.
  3. Loose or disconnected connectors in the sensor circuit.
  4. Issues with the ECM or other related components.
  5. Exposure to moisture or contaminants affecting the sensor's performance.

Symptoms of P0120 Toyota

  1. Hesitation or lack of response when pressing the accelerator pedal.
  2. Rough idling or stalling when coming to a stop.
  3. Reduced fuel efficiency or sudden changes in fuel consumption.
  4. Illumination of the Check Engine Light on the dashboard.
  5. Limited acceleration or the vehicle going into limp mode.

How to Fix P0120 Toyota

  1. Begin by diagnosing the issue using a diagnostic scanner to confirm the P0120 code and pinpoint the exact cause of the malfunction.
  2. Inspect the throttle position sensor, wiring, and connectors for any signs of damage, corrosion, or loose connections.
  3. Replace the throttle position sensor if it is found to be faulty or malfunctioning.
  4. Repair or replace any damaged wiring or connectors in the sensor circuit.
  5. Clear the error code from the ECM's memory and perform a test drive to ensure the issue has been resolved.

Cost to Fix P0120 Toyota

The typical repair costs for addressing a P0120 code in a Toyota vehicle can range from $150 to $300, depending on the specific cause of the malfunction and the cost of parts and labor. It is essential to consider that the diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Therefore, it is recommended to check with local shops for more precise estimates before proceeding with the repair.

What does this mean?

Tech Notes for P0120 Toyota

Quite a frequent problem with Toyota models. Before replacing any parts, try cleaning the throttle body and resetting the code. If the code comes back, it will be necessary to replace the Throttle Body Assembly.





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Information for Specific Toyota Models

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 Toyota Code

1. What does the OBDII code P0120 mean on a Toyota?

P0120 indicates a malfunction in the Throttle/Pedal Position Sensor 'A' circuit, which monitors the position of the throttle and sends signals to the engine control module.

2. What are the common symptoms of code P0120 on a Toyota?

Symptoms include poor engine performance, erratic idle, reduced acceleration, stalling, illuminated Check Engine Light, and possible activation of limp mode.

3. What causes the P0120 code to appear on a Toyota?

Common causes include a faulty throttle position sensor, damaged wiring or connectors, electrical short circuits, or issues with the engine control module (ECM).

4. Can I drive my Toyota with the P0120 code active?

Driving with the P0120 code is not recommended as it can lead to reduced engine performance, unsafe driving conditions, and potential damage to other engine components.

5. How do I fix the P0120 code on a Toyota?

Repairs may include replacing the throttle position sensor, repairing or replacing damaged wiring and connectors, cleaning the throttle body, or updating/replacing the ECM if necessary.

6. How is the P0120 code diagnosed on a Toyota?

A mechanic will use an OBDII scanner, inspect the throttle position sensor and wiring, test voltage signals, and verify the throttle body operation to pinpoint the issue.

7. How much does it cost to repair the P0120 code on a Toyota?

Repair costs vary but typically range from $150 to $400, depending on whether the throttle position sensor, wiring, or ECM needs replacement.

8. Can a dirty throttle body cause the P0120 code on a Toyota?

Yes, a dirty or obstructed throttle body can affect the throttle position sensor readings and trigger the P0120 code.

9. What tools are needed to fix the P0120 code on a Toyota?

Common tools include an OBDII scanner, multimeter for electrical testing, throttle body cleaner, and basic hand tools for part replacement.

10. Will clearing the P0120 code fix the problem on my Toyota?

Clearing the code may temporarily turn off the Check Engine Light, but the underlying issue must be addressed to prevent the code from returning.

Discuss the causes and fixes for P0120 Toyota OBDII Code

Submit a New Comment

  • Hi, i am encountering problem on my toyota avanza model 2011, on the run the engine check light appearing on/off and the rpm goes up and down i already brought my unit for engine scan and it said throttle pedal position switch error but after few minutes error was gone according to the mechanic. I ask if i need to replace the tps he said no instead replace my timing chain, tensioner bearing & 2 guide. Please advise. Thanks

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