P0657
PowertrainPcm Powermoderate severityActuator Supply Voltage A Circuit / Open
What P0657 Means
The PCM detected an open or fault in the actuator supply voltage A circuit. Actuators powered by this circuit may fail to operate.
Symptoms
- Multiple actuator codes
- Component not responding
- Check engine light on
Common Causes
- Open in supply voltage circuit
- Damaged wiring or connector
- Blown fuse
- PCM internal fault
Diagnostic Steps
- Scan stored codes
- Inspect supply circuit wiring and fuse
- Measure actuator supply voltage
- Test PCM power output
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