Possible causes

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

When is the code detected?

The P0645 code is stored if an open or short exists in A/C clutch relay control circuit.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P0645 Description

A/C clutch relay may also be referred to as A/C compressor clutch relay. A/C clutch relay circuit is monitored when ignition is on and battery voltage is greater than 10.4 volts.

P0645 Information for specific makes

P0645 BMW
P0645 CHRYSLER
P0645 DODGE
P0645 FORD
P0645 HYUNDAI
P0645 JEEP
P0645 KIA
P0645 MAZDA
P0645 MITSUBISHI
P0645 SUZUKI
P0645 VOLKSWAGEN
P0645 AUDI