P0955
PowertrainTransmission Shiftmoderate severityAuto Shift Manual Mode Circuit
What P0955 Means
A general fault has been detected in the automatic shift manual mode circuit. This covers the electrical circuit that enables driver-controlled manual shifting.
Symptoms
- Manual mode unavailable
- Transmission warning light on
- Shift requests ignored
Common Causes
- Faulty mode selector switch
- Wiring or connector fault
- Failed transmission control module
- Poor ground connection
Diagnostic Steps
- Scan for stored codes
- Inspect mode circuit wiring and connectors
- Test selector switch function
- Check TCM inputs with live data
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