Mercedes X Klasse Diesel AC Undervoltage Issue

I understand your frustration A similar issue happened with my previous vehicle, a 2016 BMW 5 series The undervoltage error suggests a potential electrical issue While a refrigerant leak and a faulty pressure sensor could contribute, the error code points to the electrical supply to the AC compressor itself Inspect the AC relay and associated wiring for any signs of corrosion or damage Also, confirm the integrity of the pressure switch circuit

Thanks for the insight You mentioned checking the wiring What specific points should I focus on I'm comfortable with a multimeter, but pointers on where to probe first would be great Did your BMW throw the same undervoltage code, or was it something different Was the pressure sensor the culprit

In my case, the BMW exhibited similar symptoms and presented an undervoltage fault code related to the AC compressor The resolution involved replacing a corroded wiring harness connector near the compressor I recommend you consult a qualified technician Attempting repairs without proper diagnostic equipment and expertise could potentially exacerbate the issue The cost of repair amounted to approximately 240€

Cheers I took it to a local garage and you were spot on There was a dodgy connection causing the undervoltage They cleaned it up and re-seated it, and the AC is now blowing colder than ever The total bill was 240€, so pretty much exactly what you paid Thanks again for the help