P0647

[MMeier]

A/C clutch relay circuit high... WTH is this trying to tell me now??? A/C cuts in and out at will it seems, is charged fully... bad connection somewhere or just a relay going bad. Where is the relay located for the AC in the box underhood or somewhere else? TIA!!!

 

[drewRoberts]

take a look at the wireing harness that goes to the compressor, I have seen a few that were loose and rubbed through and grounded out, or the fan got ahold of a wire(also seen this one)

 

[Kerm]

If I remember correctly that code is in refrence to the fan clutch??? When mine broke it was from the fan blade hitting it in a fender bender(at least 4 my truck it was!). Any way look under the truck up towards the fan. The wires hang out of the middle of the fan and hang down to a 4 wire plug that goes in by the radiator on the bottom side. Check that out and see if it is frayed of cut.

 

[Mobius1]

Also check where you put the fuse jumper for your tst. Check the simple things first like a blown fuse.

 

[Semicrazy]

SYMPTOM

P0647-HIGH VOLTAGE DETECTED AT THE A/C CLUTCH RELAY



WHEN MONITORED

When the ignition is on.



SET CONDITION

When the signal from the A/C Clutch output does not match the signal from the A/C Clutch feedback.



POSSIBLE CAUSES





Loose connection

Fused battery supply

A/C clutch relay

Intermittent condition

ECM

 

[MMeier]

SYMPTOM

P0647-HIGH VOLTAGE DETECTED AT THE A/C CLUTCH RELAY



WHEN MONITORED

When the ignition is on.



SET CONDITION

When the signal from the A/C Clutch output does not match the signal from the A/C Clutch feedback.



POSSIBLE CAUSES





Loose connection

Fused battery supply

A/C clutch relay

Intermittent condition

ECM

Swapped relays around... didn't help, going to check whatever connections I can get my hands on here in a bit sure as heck hope it's not the clutch itself#@$%! ... Fused battery supply?????