I should’ve mentioned that. Yes, I checked pulleys, the alternator comes with new and it compensates as it should, the otber one that is connected by rubber belt coupling is tight, does not spin at all, it’s tight, also serpentine belt is moving as it should, the compensator pulley was replaced abou...

Does any one has experience with RATD ( radiator anti tamper device? I’ve replaced the device already. Also replaced alternator with correct one, and regulator. Permament codes cleared up in ECM but it still shows me U012000 „lost communication with starter/generator control module. Car is charging ...

I have the same issue on my xc70 2010. Lin bus shorted, circuit open etc, engine hessitates after warming up, misfire of 5th cylinder, door lock failure, ignition coil primary secondary circuit issues. I thing it is related to lin bus, maybe ECM failure? I did work on serpentine belt and since then ...

4 years later and i found it so useful, thanks Marcin for posting this up! This one was my last thing in 200 k tuneup.

- Dawid