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Engine-Codes – Toyota – P0120 2009 Toyota Prius

P0120 2009 Toyota Prius Code - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction

Quick Answer

The P0120 code in a 2009 Toyota Prius indicates a Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction. Common causes include Faulty throttle pedal position sensor, Wiring or connector issues in the sensor circuit, Corrosion or damage to sensor components. 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 2009 Toyota Prius indicates Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction.
Common causes
Common causes include Faulty throttle pedal position sensor, Wiring or connector issues in the sensor circuit, Corrosion or damage to sensor components.
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 10, 2024
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Code P0120 2009 Toyota Prius Description

The P0120 code in a 2009 Toyota Prius 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 electronic throttle control system, which determines how much air and fuel should be delivered to the engine based on the driver's input.

OBDII Code P0120 2009 Toyota Prius - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction
P0120 2009 Toyota Prius Code - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction

Common Causes of P0120 2009 Toyota Prius

  1. Faulty throttle pedal position sensor
  2. Wiring or connector issues in the sensor circuit
  3. Corrosion or damage to sensor components
  4. ECM software or hardware issues
  5. Environmental factors such as moisture or heat affecting sensor performance

Symptoms of P0120 2009 Toyota Prius

  1. Engine hesitation or stalling
  2. Reduced engine power
  3. Difficulty accelerating
  4. Check Engine Light illuminated
  5. In some cases, the vehicle may go into a "limp mode"

How to Fix P0120 2009 Toyota Prius

  1. Diagnose the issue by connecting a diagnostic scanner to retrieve the specific trouble code and perform a thorough inspection of the throttle pedal position sensor and related components.
  2. Check the wiring and connectors for any signs of damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test the throttle pedal position sensor using a multimeter to ensure it is functioning within the manufacturer's specified parameters. Replace if necessary.
  4. Clear the trouble code from the ECM and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, further diagnosis may be needed to identify any underlying issues with the ECM or other related components.

Cost to Fix P0120 2009 Toyota Prius

The typical repair costs for a Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction in a 2009 Toyota Prius can range from $150 to $400, depending on the extent of the issue and the cost of parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to check with local shops for a more accurate estimate. Additionally, rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive prices.

What does this mean?

Tech Notes for P0120 2009 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.

Need more information about the P0120 2009 Toyota Prius 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 2009 Toyota Prius Code

1. What does OBDII code P0120 for a 2009 Toyota Prius indicate?

The code P0120 in a 2009 Toyota Prius indicates a Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction.

2. What are the common symptoms of a Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction in a 2009 Toyota Prius?

Common symptoms of this issue may include issues with acceleration, poor engine performance, and the vehicle going into limp mode.

3. What are the possible causes of OBDII code P0120 in a 2009 Toyota Prius?

Possible causes of code P0120 in a 2009 Toyota Prius include a faulty throttle position sensor, issues with the throttle pedal position switch, or wiring/connectivity problems.

4. How can I diagnose the Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction in my 2009 Toyota Prius?

Diagnosing this issue may involve checking the throttle position sensor's voltage, inspecting the wiring and connectors for damage, and conducting a thorough visual inspection of the throttle pedal assembly.

5. Can I continue driving my 2009 Toyota Prius with OBDII code P0120 active?

It is not recommended to continue driving your Prius with an active P0120 code, as it can lead to further damage and potential safety hazards.

6. How can I repair OBDII code P0120 in a 2009 Toyota Prius?

Repairing code P0120 may involve replacing the throttle position sensor, fixing any wiring issues, or recalibrating the throttle pedal position switch, depending on the root cause of the problem.

7. Will resetting the OBDII code P0120 in my 2009 Toyota Prius make it go away permanently?

Simply resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear.

8. Can a DIY enthusiast fix the Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction in a 2009 Toyota Prius?

While some aspects of diagnosing and repairing this issue can be done by a DIY enthusiast, it is recommended to seek professional help for a thorough diagnosis and proper repair.

9. Is it safe to clear the OBDII code P0120 in a 2009 Toyota Prius using a scan tool?

Clearing the code using a scan tool is safe and can be done once the underlying issue has been diagnosed and resolved to ensure the problem does not return.

10. How much can I expect to pay to repair OBDII code P0120 in a 2009 Toyota Prius?

The cost of repairing code P0120 can vary depending on the root cause of the issue, but it may range from $100 to $300 for parts and labor at a repair shop.

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