GLA Air Conditioning Failure

My 2013 Mercedes GLA with a gasoline engine has an air conditioning system that's stopped working. The A/C doesn't engage, so there's no cooling. Diagnostic scans show an error. I think it might be undervoltage. I've checked the AC relay. Any ideas on what to check or experiences with this HVAC issue before I go to a mechanic?

4 comment(s)

I had a similar HVAC problem in my 2016 BMW 3 Series. Same symptoms: A/C compressor off, no cooling, and error codes about low voltage. The pressure sensor was bad and caused the compressor to shut off as a safety measure. Did you check the sensor?

Did replacing the pressure sensor completely fix it, or was there anything else involved? I'm wondering if you did any other diagnostics after replacing the sensor.

Replacing the sensor fixed the problem for me. I took it to a shop, they diagnosed it, confirmed the sensor was the issue, and replaced it. I'd suggest taking it to a shop to diagnose yours.

Following your suggestion, the problem was undervoltage causing a protective shutdown. The repair was fixing the undervoltage and resetting the system. The cost was 240€.

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