P0646 Code - Air Conditioning Clutch Relay Circuit Low

What Does P0646 Mean?

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.

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What are the common causes of P0646 ?

In most cases, the code is due to a defective A/C compressor control relay, or an A/C compressor driver in the PCM, since most A/C relay control circuits are integral with the PCM. Other causes can include corroded, open or shorted wiring in the CAN Bus harness, loose module control straps, or broken ground wires.



How do you troubleshoot P0646 ?

The engine system, in conjuction with the engine control module (ECM)/powertrain control module (PCM), activates the P0646 code solenoid valve to control oil pressure to the engine mechanism that is installed in the valve system to switch valve timing between Low and High.If the engine solenoid valve has an open or short circuit, a DTC is stored.

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