P2120 Scion Code - Throttle Pedal Position Sensor/Switch 'D' Circuit
Quick Answer
The Accelerator Pedal Position (APP) sensor is built into the accelerator pedal sensor assembly and has 2 sensor circuits: VPA (main) and VPA2 (sub). Common causes include Faulty Accelerator Pedal Position (APP) Sensor, Accelerator Pedal Position Sensor harness is open or shorted, Accelerator Pedal 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
- P2120 Scion indicates Throttle Pedal Position Sensor/Switch 'D' Circuit.
- Common causes
- Common causes include Faulty Accelerator Pedal Position (APP) Sensor, Accelerator Pedal Position Sensor harness is open or shorted, Accelerator Pedal 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 P2120 Scion Description
The ECM monitors the actual accelerator pedal opening angle (throttle valve opening angle) through the signals from VPA and VPA2 and controls the throttle actuator according to these signals.
When either the output voltage of VPA or VPA2 deviates from the standard range, or the difference between the output voltages of the 2 sensor circuits is more than the threshold, the ECM determines that there is a malfunction in the accelerator pedal position sensor. The ECM then illuminates the MIL and stores a Diagnostic Trouble Code (DTC).
What are the Possible Causes of the DTC P2120 Scion?
- Faulty Accelerator Pedal Position (APP) Sensor
- Accelerator Pedal Position Sensor harness is open or shorted
- Accelerator Pedal Position Sensor circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P2120 Scion?
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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P2120 Scion 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 P2120 Scion Code
1. What are the common symptoms of OBDII code P2120 in a Scion related to the Throttle Pedal Position Sensor/Switch 'D' Circuit?
- Common symptoms include reduced engine power, hesitation or stalling when accelerating, and the vehicle going into limp mode.
2. What are the possible causes of OBDII code P2120 in a Scion?
- Possible causes include a faulty throttle pedal position sensor, damaged wiring or connectors in the sensor circuit, or a problem with the engine control module (ECM).
3. How can I diagnose the cause of OBDII code P2120 in my Scion?
- You can diagnose the issue by using a scan tool to read the trouble codes, inspecting the throttle pedal position sensor and its wiring for damage, and testing the sensor's voltage and resistance.
4. Can I still drive my Scion with OBDII code P2120 present?
- It is not recommended to drive your Scion with this code present, as it can lead to unsafe driving conditions and potential damage to the vehicle if not addressed promptly.
5. How can I repair OBDII code P2120 in my Scion?
- Repairing the issue may involve replacing the throttle pedal position sensor, repairing or replacing damaged wiring or connectors, or reprogramming the ECM to resolve the circuit malfunction.
6. Will resetting the check engine light make OBDII code P2120 go away permanently?
- Resetting the check engine light may temporarily clear the code, but if the underlying issue causing P2120 is not addressed, the code is likely to reappear after driving the vehicle for some time.
7. Can a DIY enthusiast fix OBDII code P2120 in a Scion, or should it be handled by a professional mechanic?
- While some DIY enthusiasts with automotive experience may be able to diagnose and repair OBDII code P2120, it is recommended to seek the expertise of a professional mechanic due to the complexity of the throttle pedal position sensor system.
8. How much does it typically cost to repair OBDII code P2120 in a Scion at a repair shop?
- The cost of repairing OBDII code P2120 can vary depending on the cause of the issue, but it may range from $200 to $500 for parts and labor at a repair shop.
9. Are there any preventive maintenance steps I can take to avoid OBDII code P2120 in my Scion?
- Regularly inspecting and maintaining the throttle pedal position sensor and its wiring, as well as ensuring proper engine performance, can help prevent issues that lead to OBDII code P2120.
10. Can OBDII code P2120 in a Scion cause long-term damage to the vehicle if left unresolved?
- Yes, if OBDII code P2120 is left unresolved, it can lead to further damage to the engine or transmission components, reduced fuel efficiency, and potentially unsafe driving conditions.
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