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Engine-Codes – Toyota – P0123 2006 Toyota Prius

P0123 2006 Toyota Prius Code - Throttle Position Sensor/Switch 'A' Circuit High Input

Quick Answer

The P0123 diagnostic trouble code (DTC) for a 2006 Toyota Prius indicates a Throttle Position Sensor/Switch 'A' Circuit High Input. Common causes include Faulty throttle position sensor, Damaged or corroded wiring in the TPS circuit, Loose or poor connections at the TPS connector. 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
P0123 2006 Toyota Prius indicates Throttle Position Sensor/Switch 'A' Circuit High Input.
Common causes
Common causes include Faulty throttle position sensor, Damaged or corroded wiring in the TPS circuit, Loose or poor connections at the TPS connector.
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 14, 2024
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Code P0123 2006 Toyota Prius Description

The P0123 diagnostic trouble code (DTC) for a 2006 Toyota Prius indicates a Throttle Position Sensor/Switch 'A' Circuit High Input. This means that the engine control module (ECM) has detected a higher than expected voltage signal from the throttle position sensor (TPS) or its circuit. The TPS is a crucial component that monitors the position of the throttle valve and sends this information to the ECM to adjust fuel delivery and ignition timing accordingly. When the TPS signal is too high, it can lead to improper engine performance and potentially unsafe driving conditions.

OBDII Code P0123 2006 Toyota Prius - Throttle Position Sensor/Switch 'A' Circuit High Input
P0123 2006 Toyota Prius Code - Throttle Position Sensor/Switch 'A' Circuit High Input

Common Causes of P0123 2006 Toyota Prius

  1. Faulty throttle position sensor
  2. Damaged or corroded wiring in the TPS circuit
  3. Loose or poor connections at the TPS connector
  4. ECM malfunction or software issue
  5. Mechanical issue with the throttle body

Symptoms of P0123 2006 Toyota Prius

  1. Rough idling or fluctuating idle speed
  2. Delayed or jerky throttle response
  3. Reduced engine power or acceleration
  4. Check Engine Light illuminated on the dashboard
  5. Reduced fuel efficiency

How to Fix P0123 2006 Toyota Prius

  1. Begin by verifying the P0123 code with a diagnostic scan tool and checking for any other related codes.
  2. Inspect the throttle position sensor and its wiring for any visible damage or corrosion.
  3. Test the TPS using a multimeter to ensure it is sending the correct voltage signals.
  4. Replace the throttle position sensor if it is found to be faulty, ensuring proper installation and calibration.
  5. Clear the DTCs from the ECM memory and perform a test drive to confirm that the issue has been resolved.

Cost to Fix P0123 2006 Toyota Prius

The typical repair costs for addressing a Throttle Position Sensor/Switch 'A' Circuit High Input code like P0123 on a 2006 Toyota Prius can range from $150 to $300 for parts and labor. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour for labor, but rates may be higher at dealerships or in metropolitan areas, while independent shops may offer lower rates. For a more precise estimate, it's recommended to inquire with local auto repair facilities.

What does this mean?

Tech Notes for P0123 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 high voltage from the Throttle Position Sensor (TPS) is sent to Engine Control Module (ECM).

Need more information about the P0123 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 P0123 2006 Toyota Prius Code

1. What are the common symptoms of OBDII code P0123 on a 2006 Toyota Prius?

The common symptoms of code P0123 include issues with acceleration, hesitation or stalling when pressing the gas pedal, and a decrease in fuel efficiency.

2. What does the Throttle Position Sensor/Switch 'A' Circuit High Input mean in relation to code P0123 on a 2006 Toyota Prius?

The code P0123 indicates that the Engine Control Module (ECM) has detected a high voltage input from the throttle position sensor or its circuit.

3. What are the possible causes of code P0123 on a 2006 Toyota Prius?

Possible causes of code P0123 include a faulty throttle position sensor, a damaged throttle body, wiring or connector issues, or a problem with the ECM itself.

4. How can I diagnose the root cause of OBDII code P0123 on my 2006 Toyota Prius?

To diagnose code P0123, you can start by checking the throttle position sensor's wiring and connector for any damage or corrosion. You may also need to test the sensor itself and the throttle body for proper operation.

5. Can I drive my 2006 Toyota Prius with OBDII code P0123?

It is not recommended to drive your vehicle with code P0123, as it can lead to performance issues and potentially unsafe driving conditions. It is best to address the issue promptly.

6. Is it possible to reset OBDII code P0123 on a 2006 Toyota Prius by disconnecting the battery?

Disconnecting the battery may temporarily clear the code, but it is not a permanent solution. The underlying issue causing the code needs to be identified and fixed for the code to be cleared permanently.

7. How much does it typically cost to repair OBDII code P0123 on a 2006 Toyota Prius?

The cost of repairing code P0123 can vary depending on the root cause of the issue. It may range from a few hundred dollars for a simple sensor replacement to over a thousand dollars for more complex repairs involving the throttle body or ECM.

8. Can a DIY enthusiast fix OBDII code P0123 on a 2006 Toyota Prius?

Depending on your skill level and access to tools, you may be able to replace the throttle position sensor yourself. However, diagnosing and repairing wiring or ECM issues may require professional assistance.

9. How long does it take to repair OBDII code P0123 on a 2006 Toyota Prius?

The repair time for code P0123 can vary based on the specific cause of the issue and the availability of parts. Simple sensor replacements may take an hour or two, while more complex repairs could take several hours or more.

10. Will fixing OBDII code P0123 improve the performance and fuel efficiency of my 2006 Toyota Prius?

Yes, addressing code P0123 and fixing the underlying issue with the throttle position sensor can help restore proper engine performance and improve fuel efficiency in your Toyota Prius.

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