What does code P0703 mean?

Q: What does code P0703 mean?

Torque Converter/Brake Switch B Circuit Malfunction. P0703 indicates that the powertrain control module (PCM) has detected an abnormal signal on the brake switch B circuit, which is used to tell the computer when the brake pedal is pressed. This input is critical for releasing the torque converter clutch and adjusting shift strategy, so a fault here can affect drivability and safety.

DTC codes / P07xx · Transmission / P0703

P0703Torque Converter/Brake Switch B Circuit Malfunction

P0703 indicates that the powertrain control module (PCM) has detected an abnormal signal on the brake switch B circuit, which is used to tell the computer when the brake pedal is pressed. This input is critical for releasing the torque converter clutch and adjusting shift strategy, so a fault here can affect drivability and safety.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.