P2123 2018 Toyota RAV4 Code - Throttle Pedal Position Sensor/Switch 'D' Circuit Input High

P2123 indicates a high input voltage issue in the Throttle Pedal Position Sensor/Switch "D" circuit, suggesting a potential fault in the sensor or its wiring.

Common symptoms include reduced engine performance, difficulty accelerating, the vehicle entering limp mode, and an illuminated check engine light.

Possible causes include a faulty throttle pedal position sensor, damaged or corroded wiring, a loose or disconnected electrical connector, or a malfunctioning engine control module (ECM).

Driving with a P2123 code is not recommended, as it may result in limited acceleration or limp mode, which could pose safety risks in traffic.

Diagnosis involves using a scan tool to confirm the code, inspecting the throttle pedal position sensor and its wiring for damage, and checking for proper voltage and ground signals.

Repairs may include replacing the throttle pedal position sensor, repairing or replacing damaged wiring or connectors, and clearing the code with a scan tool.

You’ll need a diagnostic scan tool, a multimeter to check voltage and continuity, and basic hand tools for removing and replacing components.

Repair costs vary but typically range from $100 to $300, depending on whether the sensor, wiring, or other components need replacement.

A dirty throttle body is unlikely to cause P2123, as the code specifically relates to the throttle pedal position sensor, not the throttle body.

Clearing the code may temporarily reset the check engine light, but the underlying issue must be resolved to prevent the code from returning.