P0703: Torque Converter/Brake Switch B Circuit Malfunction
CriticalPowertrainTransmission
What does P0703 mean?
P0703 is a diagnostic trouble code indicating "Torque Converter/Brake Switch B Circuit Malfunction". A component in the transmission has been flagged as malfunctioning by the vehicle's ECU. This requires diagnosis to determine whether the part itself has failed or if there is a related wiring or control issue.
Common causes
- Low or degraded transmission fluid
- Worn clutch packs or bands
- Faulty shift solenoid
- Wiring issue to the transmission control module
- Failing torque converter
What should you do?
This is a critical issue. Stop driving as soon as it is safe to do so and have the vehicle inspected immediately. Continuing to drive could cause further damage or pose a safety risk.
Get a diagnosis for YOUR car
Code P0703 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.