P2123 2015 Toyota RAV4 Code - Throttle Pedal Position Sensor/Switch 'D' Circuit Input High

P2123 indicates a problem with the throttle pedal position sensor/switch 'D' circuit, where the input signal is too high, suggesting a potential electrical issue or sensor malfunction.

Common symptoms include reduced engine power (limp mode), unresponsive or erratic throttle behavior, an illuminated check engine light, and difficulty accelerating.

The code can be triggered by a faulty throttle pedal position sensor, damaged wiring or connectors in the sensor circuit, corrosion, or an issue with the vehicle's engine control module (ECM).

It is not recommended to drive with this code, as it may result in limited throttle response and could compromise safety. Addressing the issue promptly is important.

Start by visually inspecting the throttle pedal position sensor, connectors, and wiring for damage or corrosion. Use a multimeter to check the sensor's voltage and continuity. A professional scan tool may also be required to monitor sensor data.

Repairs may include replacing the throttle pedal position sensor, repairing or replacing damaged wiring or connectors, cleaning corroded terminals, or, in rare cases, reprogramming or replacing the ECM.

Yes, the throttle pedal position sensor is often referred to as the accelerator pedal sensor, as it monitors the position of the accelerator pedal to control throttle input.

You may need a multimeter, a professional OBDII scan tool, and basic hand tools like a screwdriver or socket set to inspect and replace components.

The cost depends on the specific issue. Replacing the throttle pedal position sensor may cost $100–$300 including parts and labor, while wiring repairs may vary based on complexity.

In rare cases, a software update or reprogramming of the ECM may resolve the issue, but this is typically only necessary if all hardware components are confirmed to be functioning correctly.