100% Free

No Scanner Needed

Carly logo
Prices

heinzmeier1

S90 High Voltage System Error Resolved

I have a 2018 Volvo S90 hybrid with 228112 km. I'm getting a high-voltage system error message. The error is stored in memory, the engine sometimes shuts off, and power is reduced. Suspect battery drain or a defective battery. Any ideas?

Summary of the thread

A 2018 Volvo S90 hybrid was experiencing a high-voltage system error, causing the engine to shut off and reduce power. The suspected causes included battery drain or a defective battery. The issue was resolved by replacing the heavily discharged auxiliary battery, which cost 290€.

Did this summary help you solve your problem?

4 comment(s)

willimond91

That sounds like a serious issue! I had something similar happen with my old hybrid a few years back. Intermittent shutdowns and power reduction are never fun. Since it's flagging a high-voltage system error, it's likely related to the hybrid battery or the inverter. Have you noticed anything else unusual, like longer charging times (if it's a plug-in), strange noises, or any other warning lights?

heinzmeier1 (community.author)

Charging times seem normal. No strange noises or other warnings besides the high-voltage system error. Could a heavily discharged battery cause these symptoms even without other obvious signs?

willimond91

Absolutely. A deeply discharged or failing battery can definitely cause those symptoms. The car's computer monitors battery health, and if it detects a significant drop in voltage or capacity, it can trigger that high-voltage system error and reduce power to protect the system. It's possible one or more battery cells are failing internally. I'd recommend getting it checked at a workshop with hybrid experience. It’s possible to measure and check each cell individually. In my experience it could also be a faulty sensor, but the garage will be able to diagnose that, too.

heinzmeier1 (community.author)

Thanks for the insight. Took it to the workshop, and it turned out the auxiliary battery was heavily discharged. They replaced it for 290€, and the problem is resolved.

rmh_community_comment_box_header

community_crosslink_scanner_headline

community_crosslink_scanner_intro

community_crosslink_scanner_title

community_crosslink_scanner_price

community_crosslink_rmh_headline

community_crosslink_rmh_intro

community_crosslink_rmh_title

community_crosslink_rmh_subtitle

community_crosslink_rmh_brand

VOLVO

community_crosslink_rmh_model

S90