P0123 2009 Toyota Prius Code - Throttle Position Sensor/Switch 'A' Circuit High Input
Quick Answer
The Throttle Position Sensor (TPS) 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
- P0123 2009 Toyota Prius indicates Throttle Position Sensor/Switch 'A' Circuit High 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 P0123 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 P0123 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 P0123 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 P0123 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 P0123 2009 Toyota Prius Code
1. What are the common symptoms of OBDII code P0123 in a 2009 Toyota Prius?
- Common symptoms include poor acceleration, stalling, rough idling, and potential loss of power.
2. What does the P0123 code indicate in a 2009 Toyota Prius?
- The P0123 code indicates an issue with the Throttle Position Sensor/Switch 'A' Circuit High Input.
3. What are the possible causes of OBDII code P0123 in a 2009 Toyota Prius?
- Possible causes include a faulty throttle position sensor, damaged wiring or connectors, or issues with the throttle body.
4. How can I diagnose the cause of OBDII code P0123 in my 2009 Toyota Prius?
- You can use a scan tool to check for the code, visually inspect the throttle position sensor and wiring, and perform voltage tests on the sensor.
5. Can I continue driving my 2009 Toyota Prius with OBDII code P0123?
- It is not recommended to drive the vehicle with this code as it can lead to performance issues and potential safety hazards.
6. How can I repair OBDII code P0123 in my 2009 Toyota Prius?
- Repair options include replacing the throttle position sensor, repairing damaged wiring, or cleaning the throttle body.
7. Is it possible to reset the OBDII code P0123 in a 2009 Toyota Prius without fixing the issue?
- While you can clear the code with a scan tool, it is not recommended as the underlying problem will persist and may worsen over time.
8. Can a DIY enthusiast fix OBDII code P0123 in a 2009 Toyota Prius?
- Depending on your experience and tools, you may be able to replace the throttle position sensor yourself, but diagnosing and repairing wiring issues may require professional help.
9. How much does it cost to repair OBDII code P0123 in a 2009 Toyota Prius?
- The cost of repair can vary based on the root cause of the issue, but it typically ranges from $100 to $300 for parts and labor.
10. Will OBDII code P0123 cause my 2009 Toyota Prius to fail an emissions test?
- Yes, if the issue is not addressed, it can lead to increased emissions and potentially cause your vehicle to fail an emissions test.
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