What does code P0957 mean?

Q: What does code P0957 mean?

Auto Shift Manual Mode Circuit Low. P0957 indicates that the transmission control module (TCM) has detected an abnormally low voltage on the electrical circuit for the auto shift manual mode switch, which is the input that tells the computer the driver has selected manual gear selection. The TCM monitors the signal voltage and flags this code when the circuit stays below its expected range for a calibrated period, pointing to a short to ground, a faulty switch, or a wiring problem rather than a mechanical transmission failure.

DTC codes / P09xx · Transmission / P0957

P0957Auto Shift Manual Mode Circuit Low

P0957 indicates that the transmission control module (TCM) has detected an abnormally low voltage on the electrical circuit for the auto shift manual mode switch, which is the input that tells the computer the driver has selected manual gear selection. The TCM monitors the signal voltage and flags this code when the circuit stays below its expected range for a calibrated period, pointing to a short to ground, a faulty switch, or a wiring problem rather than a mechanical transmission failure.

SystemPowertrain

Code typeGeneric (all makes)

SeverityLow

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.