R Klasse AC compressor failure

My 2015 Mercedes R Klasse with a gasoline engine has an A/C issue The A/C compressor stopped working, and I'm getting an undervoltage error code I've checked for leaks and the relay, but the problem is still there What else should I check to fix this

4 comment(s)

That sounds annoying Undervoltage can mess with electrical stuff Have you checked the pressure sensor A bad sensor could send wrong readings, shutting down the A/C as a safety thing Like a breaker tripping from too much load

Thanks for the quick reply Can you tell me how to check the pressure sensor What voltage or resistance should I see, and which terminals should I test

Checking the pressure sensor without special tools is hard You need live data or a multimeter to check continuity and voltage If the undervoltage error keeps happening, a workshop visit is best They can properly diagnose it, including the pressure sensor and possible refrigerant leaks A bad sensor or low refrigerant could cause similar issues

I took your advice and saw a technician The diagnosis confirmed undervoltage, which damaged the A/C relay Replacing the relay fixed it The total was 240€ Thanks again for the help

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