P0815
PowertrainTransmission Shiftlow severityUpshift Switch Circuit
What P0815 Means
The PCM detected a fault in the upshift switch circuit used for manual gear selection. This affects the driver's ability to command upshifts in manual or semi-automatic modes.
Symptoms
- Manual upshift not responding
- Transmission stuck in gear
- Warning light on
Common Causes
- Faulty upshift switch
- Damaged wiring or connector
- Corroded switch contacts
- Faulty PCM/TCM
Diagnostic Steps
- Scan for related codes
- Test upshift switch operation
- Inspect wiring and connectors
- Verify PCM input signal
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