Actuator Supply Voltage A Circuit/Open

Where it lives

For P0657, the circuit described runs through the actuator. The description of P0657 reports the actuator as open.

Check these first

• An open in the actuator supply voltage A wire
• A blown fuse feeding actuator supply A
• Corrosion at the supply connector
• A failed actuator on supply A
• A faulty ECM actuator supply output

What to do next

1. Check the actuator supply fuse
2. Measure the supply voltage at each actuator on circuit A
3. Inspect the supply wiring and connectors for an open
4. Repair the open in the supply A wire
5. Replace the ECM if the supply is dead with the circuit good
6. Clear the code and retest

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