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Engine-Codes – Toyota – P0120 2007 Toyota Prius

P0120 2007 Toyota Prius Code - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction

Quick Answer

The P0120 diagnostic trouble code (DTC) for a 2007 Toyota Prius indicates a Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction. Common causes include Faulty throttle pedal position sensor, Wiring issues in the circuit, Poor connection between sensor and ECM. 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 2007 Toyota Prius indicates Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction.
Common causes
Common causes include Faulty throttle pedal position sensor, Wiring issues in the circuit, Poor connection between sensor and ECM.
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 2007 Toyota Prius Description

The P0120 diagnostic trouble code (DTC) for a 2007 Toyota Prius 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 is responsible for monitoring the position of the throttle pedal. The throttle pedal position sensor is a crucial component of the vehicle's electronic throttle control system, as it communicates the position of the driver's foot on the accelerator pedal to the ECM. This information is used by the ECM to adjust the throttle opening accordingly, controlling the engine's speed and power output.

OBDII Code P0120 2007 Toyota Prius - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction
P0120 2007 Toyota Prius Code - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction

Common Causes of P0120 2007 Toyota Prius

  1. Faulty throttle pedal position sensor
  2. Wiring issues in the circuit
  3. Poor connection between sensor and ECM
  4. Corrosion or damage to sensor components
  5. ECM malfunction

Symptoms of P0120 2007 Toyota Prius

  1. Lack of response when pressing the accelerator pedal
  2. Sluggish acceleration
  3. Erratic throttle response
  4. Sudden surges in engine speed
  5. Stalling

How to Fix P0120 2007 Toyota Prius

  1. Begin by diagnosing the specific cause of the issue using a diagnostic scanner to retrieve the trouble codes and pinpoint the faulty component.
  2. Inspect the throttle pedal position sensor and its wiring for any signs of damage, corrosion, or loose connections.
  3. Replace the throttle pedal position sensor if it is found to be faulty. Ensure the new sensor is properly calibrated and installed according to manufacturer specifications.
  4. Check and repair any damaged wiring or connections in the circuit that may be causing the issue.
  5. Clear the trouble codes from the ECM and perform a test drive to ensure the issue has been resolved.

Cost to Fix P0120 2007 Toyota Prius

The typical repair costs for a P0120 code on a 2007 Toyota Prius can vary depending on the specific cause of the issue and the cost of parts and labor in your area. In general, replacing a throttle pedal position sensor can range from $100 to $300, with additional costs for diagnostic testing, wiring repairs, and labor. Overall, you can expect the total repair cost to be in the range of $200 to $500. It is important to note that labor rates at auto repair shops can vary, so it is advisable to check with local shops for a more accurate estimate based on your location and vehicle.

What does this mean?

Tech Notes for P0120 2007 Toyota Prius

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).

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 2007 Toyota Prius Code

1. What are the common symptoms of OBDII code P0120 in a 2007 Toyota Prius?

- Common symptoms include stalling, poor acceleration, rough idling, and the vehicle going into limp mode.

2. What does the OBDII code P0120 for a 2007 Toyota Prius 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 2007 Toyota Prius?

- 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 OBDII code P0120 in my 2007 Toyota Prius?

- Diagnosing the code involves using a scan tool to check for the specific trouble code, testing the throttle position sensor, and inspecting the wiring and connectors for any damage.

5. Can I still drive my 2007 Toyota Prius with OBDII code P0120 active?

- It is not recommended to drive the vehicle with the code P0120 as it can lead to unsafe driving conditions and potential damage to the engine.

6. How can I repair OBDII code P0120 in my 2007 Toyota Prius?

- Repairing the code typically involves replacing the throttle position sensor, repairing any damaged wiring or connectors, or cleaning the throttle body.

7. Is it possible to reset the OBDII code P0120 in a 2007 Toyota Prius without fixing the underlying issue?

- While you can clear the code with a scan tool, it will likely reappear if the underlying issue causing the malfunction is not addressed.

8. Are there any DIY tips for fixing OBDII code P0120 in a 2007 Toyota Prius?

- DIY tips include checking for loose connections, ensuring proper sensor alignment, and following the manufacturer's repair procedures.

9. How much does it cost to repair OBDII code P0120 in a 2007 Toyota Prius?

- The cost of repair can vary depending on the specific issue, but it typically ranges from $100 to $300 for parts and labor.

10. Can a faulty throttle pedal position sensor affect fuel efficiency in a 2007 Toyota Prius?

- Yes, a faulty sensor can lead to improper fuel delivery, affecting fuel efficiency and overall performance of the vehicle.

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