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Engine-Codes – Toyota – P0122 2008 Toyota Prius

P0122 2008 Toyota Prius Code - Throttle Position Sensor/Switch 'A' Circuit Low Input

Quick Answer

The P0122 diagnostic trouble code (DTC) for a 2008 Toyota Prius indicates a problem with the Throttle Position Sensor/Switch 'A' Circuit having a low input signal. Common causes include Faulty throttle position sensor, Damaged or corroded TPS wiring or connectors, Issues with the ECM or related circuits. 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 2008 Toyota Prius indicates Throttle Position Sensor/Switch 'A' Circuit Low Input.
Common causes
Common causes include Faulty throttle position sensor, Damaged or corroded TPS wiring or connectors, Issues with the ECM or related circuits.
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 2008 Toyota Prius Description

The P0122 diagnostic trouble code (DTC) for a 2008 Toyota Prius indicates a problem with the Throttle Position Sensor/Switch 'A' Circuit having 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 injection and ignition timing accordingly.

OBDII Code P0122 2008 Toyota Prius - Throttle Position Sensor/Switch 'A' Circuit Low Input
P0122 2008 Toyota Prius Code - Throttle Position Sensor/Switch 'A' Circuit Low Input

Common Causes of P0122 2008 Toyota Prius

  1. Faulty throttle position sensor
  2. Damaged or corroded TPS wiring or connectors
  3. Issues with the ECM or related circuits
  4. Vacuum leaks affecting TPS operation
  5. Incorrect TPS adjustment or calibration

Symptoms of P0122 2008 Toyota Prius

  1. Check engine light illuminated
  2. Rough idling or stalling
  3. Hesitation or lack of response when accelerating
  4. Poor fuel efficiency
  5. Inconsistent throttle response

How to Fix P0122 2008 Toyota Prius

  1. Begin by verifying the code with a scan tool and checking for any other related codes.
  2. Inspect the throttle position sensor, wiring, and connectors for any visible damage or corrosion.
  3. Test the TPS using a multimeter to check for proper voltage signals.
  4. Replace the throttle position sensor if it is found to be faulty, ensuring proper installation and calibration.
  5. Clear the DTC and test drive the vehicle to confirm that the issue has been resolved.

Cost to Fix P0122 2008 Toyota Prius

The cost of repairing a Throttle Position Sensor/Switch 'A' Circuit Low Input issue on a 2008 Toyota Prius can vary depending on the specific cause of the problem and the labor rates in your area. Typically, the cost of a new throttle position sensor ranges from $50 to $150, while the labor cost for installation can range from $80 to $150 per hour. Therefore, the total repair cost could range from $150 to $400 or more. It's recommended to consult with a qualified mechanic or auto repair shop to get an accurate estimate based on your vehicle's specific needs. Keep in mind that labor rates may vary based on location, the complexity of the repair, and the shop's hourly rates.

What does this mean?

Tech Notes for P0122 2008 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).

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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 2008 Toyota Prius Code

1. What are the common symptoms of OBDII code P0122 in a 2008 Toyota Prius?

The common symptoms of OBDII code P0122 in a 2008 Toyota Prius include poor acceleration, stalling, rough idling, and the vehicle going into "limp mode."

2. What does the Throttle Position Sensor/Switch 'A' Circuit Low Input mean?

The code P0122 indicates that the Engine Control Module (ECM) has detected a low voltage signal from the throttle position sensor or switch.

3. What are some possible causes of the Throttle Position Sensor/Switch 'A' Circuit Low Input code in a 2008 Toyota Prius?

Possible causes of the P0122 code in a 2008 Toyota Prius include a faulty throttle position sensor, damaged wiring or connectors, a poor electrical connection, or a problem with the ECM.

4. How can I diagnose the cause of OBDII code P0122 in my 2008 Toyota Prius?

To diagnose the cause of the P0122 code, you can start by checking the throttle position sensor's wiring and connectors for any damage or corrosion. You can also perform a voltage test on the sensor to see if it is functioning properly.

5. Can I still drive my 2008 Toyota Prius with the Throttle Position Sensor/Switch 'A' Circuit Low Input code?

It is not recommended to drive your Toyota Prius with the P0122 code present, as it can lead to poor performance and potential safety issues. It is best to address the issue promptly.

6. How can I repair OBDII code P0122 in my 2008 Toyota Prius?

Repairing the P0122 code in a 2008 Toyota Prius may involve replacing the throttle position sensor, repairing damaged wiring or connectors, or addressing any other underlying issues that may have caused the code.

7. Will resetting the OBDII code P0122 in my 2008 Toyota Prius make it go away permanently?

Resetting the code may temporarily clear the check engine light, but if the underlying issue causing the P0122 code is not addressed, the code is likely to return.

8. Can a DIY enthusiast fix the Throttle Position Sensor/Switch 'A' Circuit Low Input code in a 2008 Toyota Prius?

Depending on your skill level and access to tools, a DIY enthusiast may be able to address the P0122 code by replacing the throttle position sensor or checking and repairing wiring issues. However, professional help may be necessary for complex diagnostics.

9. Is it safe to ignore the OBDII code P0122 in my 2008 Toyota Prius?

Ignoring the P0122 code can lead to performance issues and potential safety concerns while driving your Toyota Prius. It is best to address the underlying problem promptly to ensure the vehicle operates correctly.

10. How much does it cost to repair OBDII code P0122 in a 2008 Toyota Prius?

The cost of repairing the P0122 code in a 2008 Toyota Prius can vary depending on the root cause of the issue, parts needed for replacement, and labor costs. It is recommended to get a diagnostic from a mechanic for an accurate estimate.

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