Engine-Codes.com
Engine-Codes – Toyota – P0123 2007 Toyota Prius

P0123 2007 Toyota Prius Code - Throttle Position Sensor/Switch 'A' Circuit High Input

Quick Answer

The P0123 diagnostic trouble code (DTC) for a 2007 Toyota Prius indicates an issue with the Throttle Position Sensor/Switch 'A' Circuit High Input. Common causes include Faulty throttle position sensor, Damaged or corroded wiring/connectors in the TPS circuit, Issues with the 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
P0123 2007 Toyota Prius indicates Throttle Position Sensor/Switch 'A' Circuit High Input.
Common causes
Common causes include Faulty throttle position sensor, Damaged or corroded wiring/connectors in the TPS circuit, Issues with the 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 17, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0123 2007 Toyota Prius Description

The P0123 diagnostic trouble code (DTC) for a 2007 Toyota Prius indicates an issue with the Throttle Position Sensor/Switch 'A' Circuit High Input. The throttle position sensor (TPS) is a crucial component of the 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 determine the appropriate amount of air and fuel to deliver to the engine for optimal performance.

OBDII Code P0123 2007 Toyota Prius - Throttle Position Sensor/Switch 'A' Circuit High Input
P0123 2007 Toyota Prius Code - Throttle Position Sensor/Switch 'A' Circuit High Input

Common Causes of P0123 2007 Toyota Prius

  1. Faulty throttle position sensor
  2. Damaged or corroded wiring/connectors in the TPS circuit
  3. Issues with the ECM
  4. Throttle body malfunction
  5. Incorrect TPS calibration

Symptoms of P0123 2007 Toyota Prius

  1. Loss of power or hesitation during acceleration
  2. Rough idling or stalling
  3. Check Engine Light illuminated on the dashboard
  4. Reduced fuel efficiency
  5. Unresponsive throttle pedal

How to Fix P0123 2007 Toyota Prius

  1. Diagnose the issue by using a scan tool to retrieve the trouble codes and testing the TPS for proper operation.
  2. Inspect the wiring and connectors in the TPS circuit for any damage or corrosion. Repair or replace as necessary.
  3. Test the throttle body for proper functioning and clean it if needed.
  4. Replace the throttle position sensor if it is found to be faulty.
  5. Clear the trouble codes from the ECM's memory and perform a test drive to ensure the issue has been resolved.

Cost to Fix P0123 2007 Toyota Prius

The cost of repairing a P0123 code on a 2007 Toyota Prius can vary depending on the specific cause of the issue. Typically, the price range for parts such as a new throttle position sensor can be between $50 to $150. Labor costs can range from $100 to $300, depending on the shop's hourly rates and the complexity of the repair. It is advisable to contact local auto repair shops for accurate estimates based on your location and vehicle specifics.

What does this mean?

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

Need more information about the P0123 2007 Toyota Prius code?

Need more information on how to fix the P0123 2007 Toyota Prius code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0123 2007 Toyota Prius code diagnosed by a professional: Find a repair shop in your area

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 2007 Toyota Prius Code

1. What are the common symptoms of OBDII code P0123 in a 2007 Toyota Prius?

- Common symptoms include poor acceleration, rough idling, stalling, and potential issues with the vehicle's transmission shifting.

2. What can cause the Throttle Position Sensor/Switch 'A' Circuit High Input error in a 2007 Toyota Prius?

- The primary causes of this error are a faulty throttle position sensor, damaged wiring or connectors, or a problem with the engine control module (ECM).

3. How can I diagnose the Throttle Position Sensor/Switch 'A' Circuit High Input issue in my 2007 Toyota Prius?

- You can use an OBDII scanner to read the error code, visually inspect the throttle position sensor and its wiring, and perform voltage tests on the sensor.

4. Can I drive my 2007 Toyota Prius with the P0123 error code?

- It is not recommended to drive your vehicle with this error code present, as it can lead to potential safety hazards and further damage to the engine.

5. How do I repair the Throttle Position Sensor/Switch 'A' Circuit High Input problem in my 2007 Toyota Prius?

- Repairing this issue typically involves replacing the throttle position sensor, repairing or replacing damaged wiring, or reprogramming the engine control module (ECM).

6. Is it possible to reset the OBDII code P0123 in a 2007 Toyota Prius without fixing the underlying issue?

- While you can clear the error code using an OBDII scanner, the issue will likely return if the root cause of the problem is not addressed.

7. Can a dirty throttle body cause the P0123 error code in a 2007 Toyota Prius?

- While a dirty throttle body can cause related issues, the P0123 error code is specifically related to the throttle position sensor or its circuitry.

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

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

9. Will the P0123 error code cause my 2007 Toyota Prius to fail an emissions test?

- Yes, the presence of this error code can cause your vehicle to fail an emissions test, as it indicates a malfunction in the throttle position sensor circuit.

10. Can I fix the Throttle Position Sensor/Switch 'A' Circuit High Input error in my 2007 Toyota Prius myself?

- If you have experience with automotive repairs and the necessary tools, you may be able to fix this issue yourself by following a detailed repair guide or seeking assistance from a knowledgeable source.

Discuss the causes and fixes for P0123 2007 Toyota Prius OBDII Code

Submit a New Comment

Code P0123 2007 Toyota Prius comments

No comments found for this page.