Lexus ES AC undervoltage issue

My 2015 Lexus ES with a gasoline engine has an A/C problem. The A/C system doesn't switch on, and it's not cooling at all. I pulled the codes and found an error related to undervoltage. Mileage is 70055 km. Anyone seen this before?

4 comment(s)

Sounds familiar. I had a similar issue with my old BMW 3 Series. The A/C compressor kept shutting off. Was it also an undervoltage error? Did you already check the pressure sensor?

Yeah, undervoltage error. I haven't checked the pressure sensor yet. Is that a common cause? What exactly did you do to fix your BMW?

On the BMW, it turned out to be related to a faulty power distribution module causing voltage drops. Honestly, chasing electrical gremlins can be a pain. If you're seeing undervoltage errors and the A/C isn't working, I'd suggest taking it to a shop. Could be a simple fix, but better to be sure.

Thanks, I appreciate the insight. Took it to a shop, and it was indeed undervoltage. They found a corroded ground connection causing the issue. Repair cost 240€. HVAC system working great now.

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