P0766
PowertrainTransmission Solenoidmoderate severityShift Solenoid D Performance or Stuck Off
What P0766 Means
The transmission control module detects that shift solenoid D is not performing correctly or is stuck in the off position. This can cause improper gear engagement and shifting issues.
Symptoms
- Harsh or delayed shifting
- Transmission slipping
- Check engine light on
Common Causes
- Faulty shift solenoid D
- Low or dirty transmission fluid
- Wiring or connector fault
- Internal transmission damage
Diagnostic Steps
- Scan for stored transmission codes
- Check transmission fluid level and condition
- Test shift solenoid D resistance
- Inspect wiring and connectors to solenoid
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