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Engine-Codes – Toyota – P0122 2006 Toyota Prius

P0122 2006 Toyota Prius Code - Throttle Position Sensor/Switch 'A' Circuit Low Input

Quick Answer

The P0122 diagnostic trouble code (DTC) for a 2006 Toyota Prius indicates a problem with the Throttle Position Sensor/Switch 'A' Circuit, specifically a low input signal. Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Corroded or dirty TPS sensor. 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 2006 Toyota Prius indicates Throttle Position Sensor/Switch 'A' Circuit Low Input.
Common causes
Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Corroded or dirty TPS sensor.
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 17, 2024
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Code P0122 2006 Toyota Prius Description

The P0122 diagnostic trouble code (DTC) for a 2006 Toyota Prius indicates a problem with the Throttle Position Sensor/Switch 'A' Circuit, specifically a low input signal. The throttle position sensor (TPS) is a crucial component of the electronic throttle control system, which helps regulate the amount of air entering the engine. The TPS monitors the position of the throttle valve and sends this information to the engine control module (ECM) to adjust fuel delivery and ignition timing accordingly.

OBDII Code P0122 2006 Toyota Prius - Throttle Position Sensor/Switch 'A' Circuit Low Input
P0122 2006 Toyota Prius Code - Throttle Position Sensor/Switch 'A' Circuit Low Input

Common Causes of P0122 2006 Toyota Prius

  1. Faulty throttle position sensor
  2. Damaged wiring or connectors in the TPS circuit
  3. Corroded or dirty TPS sensor
  4. Issues with the engine control module (ECM)
  5. Environmental factors such as moisture or debris affecting the TPS

Symptoms of P0122 2006 Toyota Prius

  1. Rough idling or stalling
  2. Lack of power or poor acceleration
  3. Reduced fuel efficiency
  4. Check Engine Light illuminated
  5. Limited vehicle speed or performance

How to Fix P0122 2006 Toyota Prius

  1. Begin by diagnosing the issue using a scan tool to confirm the P0122 code and identify the specific cause.
  2. Inspect the throttle position sensor, wiring, and connectors for any visible damage or corrosion. Clean or replace components as needed.
  3. Test the TPS using a multimeter to ensure it is functioning within the manufacturer's specified range.
  4. If the TPS is faulty, replace it with a new sensor and recalibrate as necessary.
  5. Clear the DTC and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P0122 2006 Toyota Prius

The cost of repairing a P0122 code on a 2006 Toyota Prius can vary depending on the specific cause of the issue and the labor rates in your area. Generally, replacing a throttle position sensor can range from $100 to $300, including parts and labor. Additional costs may apply if wiring or connectors need to be repaired or replaced. It's recommended to consult with a qualified mechanic or repair shop for an accurate estimate based on your vehicle's needs. Keep in mind that diagnostic time and labor rates can impact the final cost, so it's advisable to inquire about these factors before proceeding with the repair.

What does this mean?

Tech Notes for P0122 2006 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 2006 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 2006 Toyota Prius Code

1. What are the common symptoms of OBDII code P0122 in a 2006 Toyota Prius?

- Common symptoms include issues with acceleration, idle fluctuations, poor fuel economy, and potentially stalling.

2. What does the OBDII code P0122 'Throttle Position Sensor/Switch 'A' Circuit Low Input' mean for a 2006 Toyota Prius?

- This code indicates that there is a low voltage input signal coming from the throttle position sensor or switch in the Prius.

3. What are the possible causes of OBDII code P0122 in a 2006 Toyota Prius?

- The potential causes include a faulty throttle position sensor, damaged wiring or connectors, a corroded sensor, or issues with the throttle body.

4. How can I diagnose the cause of OBDII code P0122 in my 2006 Toyota Prius?

- Diagnosing the issue involves checking the throttle position sensor's voltage output, inspecting wiring and connectors for damage, and testing the throttle body for proper operation.

5. Can I drive my 2006 Toyota Prius with OBDII code P0122?

- It is not recommended to drive the vehicle with this code present, as it can lead to performance issues and potentially unsafe driving conditions.

6. How can I clear the OBDII code P0122 from my 2006 Toyota Prius?

- Clearing the code can be done using an OBDII scanner or by disconnecting the car's battery for a few minutes to reset the system.

7. Is it possible to repair OBDII code P0122 in a 2006 Toyota Prius by myself?

- Depending on your level of automotive knowledge, you may be able to repair this issue yourself by replacing the throttle position sensor or fixing any wiring problems.

8. How much does it typically cost to fix OBDII code P0122 in a 2006 Toyota Prius at a mechanic?

- The cost of repair can vary but generally ranges from $100 to $300, including parts and labor.

9. What are some tips to prevent OBDII code P0122 from appearing in my 2006 Toyota Prius in the future?

- Regularly inspect and maintain the throttle position sensor, wiring, and connectors to ensure they are in good condition and functioning properly.

10. Can OBDII code P0122 in a 2006 Toyota Prius affect the vehicle's overall performance?

- Yes, this code can impact the vehicle's performance by causing issues with acceleration, fuel efficiency, and overall drivability.

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