P0951
PowertrainTransmission Shiftmoderate severityAuto Shift Manual Control Circuit Range/Performance
What P0951 Means
The automatic shift manual (ASM) control circuit is reading values outside the expected range or performing erratically. This affects manual mode shifting in automatic transmissions with a tap-shift or paddle-shift feature.
Symptoms
- Manual shift mode not working
- Erratic or delayed gear changes
- Transmission warning light on
Common Causes
- Faulty shift selector switch
- Damaged wiring or connectors in shift circuit
- Failed transmission control module
- Corroded or loose ground connection
Diagnostic Steps
- Scan for related transmission codes
- Test shift selector switch operation
- Inspect wiring and connectors for damage
- Check TCM inputs with scan tool live data
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