P0658 — Actuator A supply voltage - low circuit

Diagnostic algorithm

1. Retrieve freeze frame and live data. Note battery voltage when code set.
2. Verify battery health and charging system (voltage at battery terminals with key ON and engine running). Replace or charge battery if weak.
3. Inspect and verify all fuses and relays in the actuator A supply circuit. Replace any blown or suspect components.
4. Visually inspect wiring and connectors from PCM/relay/fuse to the actuator. Repair damaged insulation, corrosion, or loose terminals.
5. Backprobe the actuator supply terminal with key ON (engine OFF) and confirm supply voltage equals battery voltage. If low, trace back toward fuse/relay/PCM.
6. If voltage is present at fuse/relay but low at the actuator, perform voltage drop test under load to locate high resistance point (measure battery positive to actuator supply while operating).
7. Check continuity and resistance between actuator supply pin and fuse/relay/PCM. Look for short to ground or open circuit.
8. Disconnect the actuator and measure resistance between its supply terminal and ground to detect internal short or excessive draw.
9. If wiring and actuator check good, test or substitute the actuator with a known-good unit where possible.
10. If problem persists and wiring/actuator are confirmed good, inspect PCM/ECM supply driver and grounds. Consider module bench test or replacement per manufacturer procedures.
11. After repair, clear codes and perform functional test/road test. Monitor for code recurrence and verify system operation.