P2135 2018 Toyota RAV4 Code - Throttle / Pedal Position Sensor / Switch 'A' / 'B' Voltage Correlation

P2135 indicates a voltage correlation issue between the throttle or pedal position sensors 'A' and 'B,' meaning the readings from these sensors do not match as expected.

Common symptoms include reduced engine performance, the throttle becoming unresponsive, the vehicle entering "limp mode," and the illumination of the check engine light.

Possible causes include a faulty throttle position sensor (TPS), a damaged accelerator pedal position sensor, wiring issues such as corrosion or poor connections, or a malfunctioning throttle body.

It is not recommended to drive for long distances with this code active, as the vehicle may go into limp mode, potentially creating unsafe driving conditions.

Possible fixes include inspecting and repairing damaged wiring or connectors, cleaning or replacing the throttle body, and replacing faulty sensors like the TPS or accelerator pedal position sensor.

You will need an OBDII scanner to read the code, a multimeter to test sensor voltage and continuity, and potentially basic hand tools to access and inspect components.

Repair costs vary depending on the issue. Replacing a throttle position sensor may cost $100–$300, while throttle body replacement can cost $300–$700, including parts and labor.

Yes, carbon buildup or debris in the throttle body can cause improper sensor readings, potentially triggering the P2135 code.

It depends on your vehicle's warranty status. If the powertrain or emissions warranty is still active, the repair may be covered. Check with your dealer for confirmation.

In some cases, a throttle body relearn procedure may be required after cleaning or replacing the throttle body. Consult your vehicle's repair manual or dealership for guidance.