P2122 Scion Code - Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
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
- P2122 Scion indicates Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low.
- 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 P2122 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 P2122 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 P2122 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 P2122 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 P2122 Scion Code
1. What does the OBDII code P2122 mean on a Scion?
Code P2122 indicates a low input signal from the Throttle Pedal Position Sensor/Switch 'D' circuit, which monitors the position of the accelerator pedal.
2. What are the symptoms of a P2122 code on a Scion?
Common symptoms include reduced engine power, poor throttle response, activation of "limp mode," and the illumination of the check engine light.
3. What causes the P2122 code on a Scion?
Possible causes include a faulty throttle pedal position sensor, damaged wiring or connections, a malfunctioning ECM, or corroded electrical terminals.
4. Can I drive my Scion with a P2122 code?
Driving with a P2122 code is not recommended, as it can result in limited engine power and unsafe driving conditions due to throttle inconsistencies.
5. How do I fix a P2122 code on my Scion?
Repairs may include replacing the throttle pedal position sensor, repairing or replacing damaged wiring or connectors, cleaning corroded terminals, or reprogramming the ECM if needed.
6. How do I diagnose a P2122 code on my Scion?
Diagnosis typically involves checking the throttle pedal position sensor with a multimeter, inspecting wiring and connections for damage, and scanning the ECM for related codes.
7. How much does it cost to repair a P2122 code on a Scion?
Repair costs can range from $100 to $400, depending on whether the issue is a sensor replacement, wiring repair, or ECM reprogramming.
8. What happens if I ignore the P2122 code on my Scion?
Ignoring a P2122 code can lead to continued throttle response issues, reduced drivability, and potential safety hazards while driving.
9. Can a bad battery cause the P2122 code on a Scion?
While unlikely, a weak or bad battery could contribute to electrical issues that affect the throttle pedal position sensor circuit.
10. Will clearing the P2122 code fix the problem on my Scion?
Clearing the code may temporarily turn off the check engine light, but the underlying issue must be addressed to prevent the code from returning.
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