Mercedes GLE Hybrid High Voltage Error

I understand your concern. Similar symptoms happened with a 2019 Volvo XC90 T8 I worked on. It had a depleted high-voltage battery and a faulty charging module. Has the car had a diagnostic scan to check the fault codes? Also, have you checked the 12V auxiliary battery? A bad one can cause errors in the high-voltage system.

Thanks, a scan pointed to the high-voltage battery. I haven't checked the 12V auxiliary battery yet. Could a weak auxiliary battery really cause a high-voltage system error? I thought they were separate.

Yes. The 12V auxiliary system often helps the high-voltage system work. A low charge or problem with the 12V battery can cause wrong codes and issues in the high-voltage system. I still suggest a certified hybrid technician check it out.

Thank you for the advice. I had the 12V battery checked, and it was bad, causing problems with the high-voltage system. Replacing it fixed everything. The cost was 290€, which is much better than I expected.