P0122 2009 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 2009 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 2009 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 2009 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 2009 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 2009 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 2009 Toyota Prius Code
1. What are the common symptoms of OBDII code P0122 on a 2009 Toyota Prius?
The common symptoms of code P0122 in a 2009 Toyota Prius include reduced engine power, hesitation or stalling when accelerating, and the vehicle going into limp mode.
2. What causes the Throttle Position Sensor/Switch 'A' Circuit Low Input code (P0122) on a 2009 Toyota Prius?
The P0122 code on a 2009 Toyota Prius is typically caused by a faulty throttle position sensor, damaged wiring or connectors in the throttle position sensor circuit, or issues with the engine control module.
3. How can I diagnose the Throttle Position Sensor/Switch 'A' Circuit Low Input code (P0122) on my 2009 Toyota Prius?
Diagnosing the P0122 code involves using a scan tool to read the code, checking the throttle position sensor's voltage output, inspecting the wiring and connectors for damage, and testing the throttle position sensor's resistance.
4. Can I drive my 2009 Toyota Prius with OBDII code P0122?
It is not recommended to drive your 2009 Toyota Prius with the P0122 code present, as it can lead to further damage to the engine or catalytic converter. It's best to address the issue promptly.
5. How do I repair the Throttle Position Sensor/Switch 'A' Circuit Low Input code (P0122) on a 2009 Toyota Prius?
To repair the P0122 code, you may need to replace the throttle position sensor, repair any damaged wiring or connectors in the circuit, or reprogram the engine control module. It's recommended to consult a professional mechanic for proper diagnosis and repair.
6. Is it possible to reset the OBDII code P0122 on a 2009 Toyota Prius by disconnecting the battery?
Disconnecting the battery may temporarily clear the P0122 code, but it is not a permanent solution. The underlying issue causing the code must be diagnosed and repaired to prevent it from reoccurring.
7. How much does it cost to fix OBDII code P0122 on a 2009 Toyota Prius?
The cost to fix the P0122 code on a 2009 Toyota Prius can vary depending on the cause of the issue, parts needed for repair, and labor costs. It's advisable to get a professional diagnosis and estimate from a trusted mechanic.
8. Can a dirty throttle body cause OBDII code P0122 on a 2009 Toyota Prius?
While a dirty throttle body can cause related issues, such as poor acceleration or rough idling, it is not a common cause of the specific P0122 code. It's best to focus on inspecting the throttle position sensor and its circuit for this code.
9. Will replacing the throttle position sensor fix OBDII code P0122 on a 2009 Toyota Prius?
Replacing the throttle position sensor may resolve the P0122 code if the sensor is indeed faulty. However, it's essential to properly diagnose the issue to ensure that the sensor replacement will address the root cause of the code.
10. Can a DIY enthusiast repair OBDII code P0122 on a 2009 Toyota Prius?
While some DIY enthusiasts may be able to diagnose and repair the P0122 code on a 2009 Toyota Prius, it is recommended to have the issue addressed by a professional mechanic due to the complexity of the throttle position sensor circuit and engine control system.
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