P0957
PowertrainTransmission Shiftmoderate severityAuto Shift Manual Mode Circuit Low
What P0957 Means
The automatic shift manual mode circuit is reading a lower than expected voltage. This suggests a short to ground or open in the mode circuit wiring.
Symptoms
- Manual mode does not engage
- Transmission stuck in auto mode
- Warning light illuminated
Common Causes
- Short to ground in wiring
- Faulty mode selector switch
- Corroded connector pins
- Failed transmission control module
Diagnostic Steps
- Scan for stored codes
- Measure circuit voltage at connector
- Inspect wiring for shorts to ground
- Test switch resistance
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