Grandland X Auxiliary Battery Error

Auxiliary battery issues are quite common in hybrids, especially with that mileage. Have you checked the voltage of the auxiliary battery? A healthy battery should read around 12.6 volts when the car is off. If it's significantly lower, say around 11.8 volts or less, it's likely not holding a charge – think of it like a leaky bucket. Also, is the error message persistent, or does it come and go?

Thanks for the quick reply! I haven't measured the voltage myself, but that's a good idea. I'll try to get a multimeter and check it out. The error message is pretty consistent; it's there almost every time I start the car. If the voltage is low, what does that usually mean? Is it just a bad battery, or could there be something else draining it?

A consistently low voltage, coupled with your symptoms, strongly suggests a failing auxiliary battery. While there's a small chance of a parasitic drain, the age and mileage of your Grandland X point to simple battery failure. It's like a lightbulb that's burned out. I'd recommend taking it to a workshop with hybrid experience for a diagnostic check and likely battery replacement. Ignoring it could lead to further electrical issues.

Thanks for the advice! I checked the voltage, and it was indeed low. I took it to a local shop, and they confirmed the auxiliary battery was toast. They replaced it for 290€, and now everything seems to be working fine. Appreciate the help!