P0790
PowertrainTransmission Shiftmoderate severityNormal/Performance Switch Circuit Malfunction
What P0790 Means
The normal/performance mode switch circuit is not functioning correctly. This affects the transmission's ability to change shift modes.
Symptoms
- Unable to change shift mode
- Stuck in one shift program
- Check engine light on
Common Causes
- Faulty mode switch
- Wiring or connector fault
- Failed valve body
- Internal transmission fault
Diagnostic Steps
- Test the mode switch operation
- Scan for related codes
- Inspect switch wiring and connectors
- Check transmission fluid and valve body
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