P0956
PowertrainTransmission Shiftmoderate severityAuto Shift Manual Mode Circuit Range/Performance
What P0956 Means
The automatic shift manual mode circuit is operating outside its expected range or performing poorly. Signal values do not match commanded shift requests.
Symptoms
- Inconsistent manual mode operation
- Delayed shift response
- Transmission warning light on
Common Causes
- Faulty mode selector switch
- Damaged wiring or connectors
- Failed transmission control module
- Corroded ground connection
Diagnostic Steps
- Scan for related codes
- Compare commanded vs actual signals in live data
- Inspect wiring and connectors
- Test selector switch operation
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