What is code P0646 mean?

A/C Clutch Relay Control Circuit Low
P0646 is a diagnostic trouble code (DTC) for “A/C Clutch Relay Control Circuit Low”.

What is the code P0645?

What Does the P0645 Code Mean? The Diagnostic Trouble Code (DTC) P0645 stands for “A/C Clutch Relay Control Circuit.” The Diagnostic Trouble Code (DTC) P0645 indicates “A/C Clutch Relay Control Circuit.” The PCM controls the A/C compressor clutch relay through the control circuit driver.

How do I fix code P0645?

How To Correct P0645 A/C Clutch Relay Control Circuit

1. Replacing the A/C clutch relay.
2. Replacing blown fuse or fuse-able link (if applicable)
3. Cleaning corrosion from connectors.
4. Evacuate and recharge A/C system.
5. Repairing or replacing wiring.
6. Repairing or replacing ground straps.
7. Replacing a control module.

Which relay controls the AC compressor?

The air conditioner (A/C) relay, is a relay used to send electrical power to the air conditioning compressor, and air conditioning compressor clutch when the system is turned on. It operates just like any other relay, and is often controlled by a button labeled ‘A/C’.

What controls the AC compressor clutch?

Looking at the graph the compressor clutch has a unique relay, it has a compressor control relay that operates in a variety of ways depending upon the application. From the two fuses, one is controlling the coil in the relay (using a 10 amp fuse) that feeds from the relay.

What are the symptoms of a bad AC relay?

Common signs include inconsistent cooling, not hearing a click from the compressor turning on, and no cold air.

How do you test a relay?

Here’s How To Test a Relay

1. Locate the relay you need to test.
2. The quickest and easiest way to test a relay is to swap it out with a known good replacement.
3. Grab a multimeter and set it to Ohms.
4. Leave the multimeter on ohms or continuity.
5. Energize the electromagnet coil with a 9-12V battery across the pins.

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