2006 Jetta AC problems

I have read a lot on here and can’t seem to find a solution. My AC will not come on I only have 8 volts to the compressor I assume it should be 12? My fans seem to work. When I bought the car the AC wasn’t working due to previous owner cutting out the outside air temp sensor. I bought a VAG and it tells me “00898 control circuit AC coppressor speed difference too great”. I replaced the compressor a couple years ago shortly after I got the car. Any suggestions?

Unplug the RCV and see if the message changes.

With the RCV unplugged I get a fault of “control circuit AC compressor.”
What voltage should be at the RCV?
The fans do come on so it has to be building some pressure I would think. After plugging it back in and waiting a while It’s back to “control circuit AC compressor speed difference too great”

If you do a physical inspection of the A/C pulley, is the center shaft rotating? There are some protective straps on the pulley that can break to keep a compressor failure from causing further harm to other parts of the engine.

Thanks for the suggestion Sptsailing! It seems like you have found my problem the shaft on the compressor is not turning.