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?

Code P0646 may be stored if an open or short exists in A/C clutch relay control circuit.

Symptoms

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

P0646 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.

P0646 Information for specific makes

P0646 BMW
P0646 CHRYSLER
P0646 DODGE
P0646 HYUNDAI
P0646 JEEP
P0646 KIA
P0646 MAZDA
P0646 SUZUKI