P2122 2008 Toyota Camry Code - Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low

P2122 indicates that the Throttle Pedal Position Sensor/Switch 'D' is detecting a low voltage input, which may affect throttle control and vehicle performance.

Symptoms include reduced engine power, poor acceleration, the throttle not responding properly, and the activation of the Check Engine Light.

Common causes include a faulty throttle pedal position sensor, damaged wiring or connectors, corrosion in the circuit, or issues with the engine control module (ECM).

Driving may be possible but is not recommended, as the vehicle could enter "limp mode," reducing power and potentially creating unsafe driving conditions.

Start by inspecting the throttle pedal position sensor, checking for damaged wiring, loose connections, or corrosion in the sensor’s circuit. Use a multimeter to test voltage and continuity.

Repairs may include replacing the throttle pedal position sensor, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming the ECM if necessary.

The cost can vary depending on the issue. Replacing the throttle pedal position sensor may cost $100–$300, while wiring repairs or ECM reprogramming could add to the expense.

A dirty throttle body is unlikely to cause P2122 directly, as the code relates specifically to the throttle pedal position sensor circuit and not the throttle body itself.

Clearing the code may turn off the Check Engine Light temporarily, but if the underlying issue isn’t repaired, the code will return.

You’ll need an OBDII scanner to read and clear codes, a multimeter to test voltage and continuity, and basic hand tools for inspecting and repairing components.