P2123 Scion Code - Throttle Pedal Position Sensor/Switch 'D' Circuit Input High
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
- P2123 Scion indicates Throttle Pedal Position Sensor/Switch 'D' Circuit Input High.
- 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 P2123 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 P2123 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 P2123 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 P2123 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 P2123 Scion Code
What does OBDII code P2123 mean for a Scion?
P2123 indicates an issue with the Throttle Pedal Position Sensor/Switch 'D' Circuit, specifically that the input signal is higher than expected.
What are the common symptoms of code P2123 in a Scion?
Symptoms may include reduced engine performance, hesitation during acceleration, unintended acceleration, or activation of the Check Engine Light.
What causes the P2123 code in a Scion?
The code is usually caused by a faulty throttle pedal position sensor, damaged wiring or connectors in the sensor circuit, or issues with the engine control module (ECM).
How can I diagnose the P2123 code in my Scion?
Start by scanning for trouble codes, inspecting the throttle pedal position sensor and its wiring for damage, and checking the voltage readings to ensure they are within specifications.
Is it safe to drive my Scion with code P2123?
Driving with this code may result in reduced performance or dangerous acceleration issues. It’s best to address the problem promptly to avoid potential safety hazards.
How do I fix the P2123 code in a Scion?
Common fixes include replacing the throttle pedal position sensor, repairing damaged wiring or connectors, and clearing the code with an OBDII scanner after repairs.
Can the P2123 code be caused by a dirty throttle body?
No, P2123 is specifically related to the throttle pedal position sensor circuit and is not directly connected to the cleanliness of the throttle body.
How much does it cost to repair code P2123 in a Scion?
Repair costs vary but typically include $100-$300 for a throttle pedal position sensor replacement or $50-$150 for wiring repairs, depending on labor rates and parts.
Will replacing the throttle pedal position sensor always fix the P2123 code?
Not always. If the issue lies in the wiring, connectors, or ECM, replacing the sensor alone may not resolve the problem.
Can a low battery voltage cause the P2123 code in a Scion?
While rare, electrical issues such as low battery voltage or weak connections can sometimes affect sensor readings and trigger this code.
Discuss the causes and fixes for P2123 Scion OBDII Code
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