P0122 2008 Toyota Prius Code - Throttle Position Sensor/Switch 'A' Circuit Low Input
Quick Answer
The Throttle Pedal Position (TPP) responds to the accelerator pedal movement. Common causes include Faulty throttle position sensor, Throttle position sensor harness is open or shorted, Throttle position sensor circuit poor electrical connection. 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, Throttle position sensor harness is open or shorted, Throttle position sensor circuit poor electrical connection.
- 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.
Code P0122 2008 Toyota Prius Description
Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sensor. This sensor controls engine operation such as fuel cut. On the other hand, the Wide open and closed throttle position switch, which is built into the throttle position sensor unit, is not used for engine control.
What are the Possible Causes of the DTC P0122 2008 Toyota Prius?
- Faulty throttle position sensor
- Throttle position sensor harness is open or shorted
- Throttle position sensor circuit poor electrical connection
How to Fix the DTC P0122 2008 Toyota Prius?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0122 2008 Toyota Prius code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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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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