A/C Clutch Relay Control Circuit High

Where it lives

For P0647, the relay sits on the circuit this code reports. The description of P0647 reports a fault at the relay.

Check these first

• A short to voltage on the A/C clutch control wire
• A failed A/C clutch relay
• Corrosion or chafing in the clutch wiring
• A weak ground at the relay
• A faulty PCM relay driver

What to do next

1. Check the A/C clutch relay and its fuse
2. Inspect the clutch control wire for a short to voltage
3. Check the relay ground and connectors
4. Test the clutch coil resistance
5. Repair the short if the control wire reads high
6. Clear the code and retest

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