P0789
PowertrainTransmission Solenoidmoderate severityShift/Timing Solenoid Intermittent
What P0789 Means
The shift or timing solenoid circuit is showing an intermittent fault. Problems come and go, often due to loose wiring or connectors.
Symptoms
- Intermittent harsh shifts
- Occasional check engine light
- Random shift delays
Common Causes
- Loose or corroded connector
- Intermittent wiring fault
- Failing solenoid
- Valve body issues
Diagnostic Steps
- Wiggle test wiring and connectors
- Check for stored and pending codes
- Monitor solenoid signal while driving
- Inspect valve body and fluid condition
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