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Engine-Codes – Toyota – P0122 2007 Toyota Prius

P0122 2007 Toyota Prius Code - Throttle Position Sensor/Switch 'A' Circuit Low Input

Quick Answer

The P0122 diagnostic trouble code (DTC) for a 2007 Toyota Prius indicates an issue with the Throttle Position Sensor/Switch 'A' Circuit, specifically a low input signal. Common causes include A faulty throttle position sensor, Damaged or corroded wiring/connectors in the TPS circuit, Issues with the ECM receiving the TPS signal. 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
P0122 2007 Toyota Prius indicates Throttle Position Sensor/Switch 'A' Circuit Low Input.
Common causes
Common causes include A faulty throttle position sensor, Damaged or corroded wiring/connectors in the TPS circuit, Issues with the ECM receiving the TPS signal.
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 15, 2024
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Code P0122 2007 Toyota Prius Description

The P0122 diagnostic trouble code (DTC) for a 2007 Toyota Prius indicates an issue with the Throttle Position Sensor/Switch 'A' Circuit, specifically a low input signal. The throttle position sensor (TPS) is a crucial component of the vehicle's electronic throttle control system, responsible for monitoring the position of the throttle pedal and sending this information to the engine control module (ECM). The ECM uses this data to adjust the air-fuel mixture and control the engine's performance.

OBDII Code P0122 2007 Toyota Prius - Throttle Position Sensor/Switch 'A' Circuit Low Input
P0122 2007 Toyota Prius Code - Throttle Position Sensor/Switch 'A' Circuit Low Input

Common Causes of P0122 2007 Toyota Prius

  1. A faulty throttle position sensor.
  2. Damaged or corroded wiring/connectors in the TPS circuit.
  3. Issues with the ECM receiving the TPS signal.
  4. Mechanical issues affecting the throttle body's operation.
  5. Environmental factors such as moisture or debris affecting sensor performance.

Symptoms of P0122 2007 Toyota Prius

  1. Poor acceleration or hesitation when pressing the throttle pedal.
  2. Rough idling or stalling when coming to a stop.
  3. Decreased fuel efficiency.
  4. Illumination of the Check Engine Light on the dashboard.
  5. Reduced engine performance or power output.

How to Fix P0122 2007 Toyota Prius

  1. Begin by diagnosing the issue using a scan tool to retrieve the specific trouble code and perform a visual inspection of the TPS and related components.
  2. Test the TPS using a multimeter to check for proper voltage output within the specified range.
  3. Inspect the wiring and connectors for any damage or corrosion, repairing or replacing as necessary.
  4. If the TPS is found to be faulty, replace it with a new sensor following the manufacturer's guidelines.
  5. Clear the DTC from the ECM's memory and perform a test drive to ensure the issue has been resolved.

Cost to Fix P0122 2007 Toyota Prius

The typical repair costs for addressing a P0122 code on a 2007 Toyota Prius can vary depending on the specific cause of the issue. In general, replacing a faulty throttle position sensor can range from $100 to $200, including parts and labor. However, if additional components need to be replaced or if extensive diagnostics are required, the total repair cost may increase. It's important to factor in the specific diagnosis time and labor rates at auto repair shops, which can vary based on location and other factors. It's recommended to consult with a trusted mechanic or dealership for a more accurate estimate based on your vehicle's needs.

What does this mean?

Tech Notes for P0122 2007 Toyota Prius

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?

An excessively low voltage from the Throttle Position Sensor (TPS) is sent to Engine Control Module (ECM).

Need more information about the P0122 2007 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 P0122 2007 Toyota Prius Code

1. What are the common symptoms of OBDII code P0122 in a 2007 Toyota Prius?

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

2. What does the OBDII code P0122 indicate in a 2007 Toyota Prius?

- The code P0122 indicates a low input signal from the throttle position sensor/switch 'A' circuit.

3. What are the possible causes of the Throttle Position Sensor/Switch 'A' Circuit Low Input code in a 2007 Toyota Prius?

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

4. How can I diagnose the Throttle Position Sensor/Switch 'A' Circuit Low Input code in my 2007 Toyota Prius?

- Diagnose the code by checking the throttle position sensor's wiring and connectors for damage, testing the sensor's voltage output, and inspecting the throttle body for any issues.

5. Can I drive my 2007 Toyota Prius with the P0122 code?

- It is not recommended to drive your vehicle with the P0122 code as it can result in poor performance and potentially lead to more serious issues.

6. How can I repair the Throttle Position Sensor/Switch 'A' Circuit Low Input code in my 2007 Toyota Prius?

- Repair options include replacing the throttle position sensor, repairing damaged wiring or connectors, cleaning or replacing the throttle body, or reprogramming the engine control module.

7. Will resetting the OBDII code P0122 in my 2007 Toyota Prius resolve the issue?

- Resetting the code may temporarily clear the warning light, but it will not fix the underlying problem causing the P0122 code.

8. How much does it typically cost to repair the Throttle Position Sensor/Switch 'A' Circuit Low Input code in a 2007 Toyota Prius?

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

9. Can a DIY enthusiast fix the P0122 code in a 2007 Toyota Prius?

- Depending on your skill level and access to tools, you may be able to replace the throttle position sensor or check wiring connections yourself. However, more complex repairs may require professional assistance.

10. How important is it to address the OBDII code P0122 promptly in a 2007 Toyota Prius?

- It is crucial to address the P0122 code promptly to prevent further damage to your vehicle and maintain optimal performance and fuel efficiency.

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