P0645 Code - Air Conditioning Clutch Relay Circuit Malfunction

What Does P0645 Mean?

OBD-II Code P0645 is defined as a A/C Clutch Relay Control Circuit

The engine control module (PCM) uses a relay to control voltage to the A/C Compressor Clutch. The A/C clutch engages, allowing the Air Conditioning system to operate. When the PCM is unable to control the relay, code P0645 will set.

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What are the common causes of P0645 ?

• Faulty Air Conditioning Clutch Relay
• Air Conditioning Clutch Relay harness is open or shorted
• Air Conditioning Clutch Relay circuit poor electrical connection

How do you troubleshoot P0645 ?

Corroded or otherwise damaged wires can be replaced, or if the source of the problem is not easily identifiable, the entire wiring harness can be replaced. Sometimes this is the more affordable option.

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