Why did my Genesis GV60 lose power with a 12V battery warning?

Short answer: On the GV60, a popping sound followed by an electric-system warning, then a '12V battery voltage low' message and loss of power, points to the ICCU (integrated charging control unit). That part charges the small 12-volt battery from the big battery. If it fails, the 12V battery runs down and the car loses drive power. Hyundai and Genesis recalled these cars (NHTSA 24V868, which replaced 24V204). If your car is part of this recall, the dealer fixes it for free.

Symptom: A pop from under the car or from the back, a 'Check electric vehicle system' or 'STOP VEHICLE & CHECK POWER SUPPLY' warning, limp mode, then '12V battery voltage low. Stop safely' and a car that shuts down.

What to check first

1. Run your VIN for recall 24V868 at nhtsa.gov/recalls or on the Genesis site. If you had the earlier 24V204 work done, the newer remedy still applies.
2. If you hear a pop and get an EV system warning, get off the road and call Genesis roadside. Owners say the 12V battery can die within days.
3. Keep the physical key handy. One owner needed it once the 12V battery was flat.
4. Ask the dealer to test the 12V battery too. In one thread it failed testing and was replaced along with the ICCU.

Likely causes

1. Failed ICCU (recalls 24V204/24V868). Hyundai says the ICCU may be damaged and stop charging the 12V battery, which can cause a loss of drive power. Dealers inspect and replace the ICCU and its fuse, and update its software.
2. Drained or damaged 12V battery. A 12V battery that's been run flat may fail testing and need replacing too.

What it usually costs

The recall repair is free. Owners didn't post out-of-pocket prices. The bigger cost was time: one owner's ICCU was backordered for about a month.

Is it safe to keep driving?

No. Once the warning appears, the car can lose drive power, which is dangerous in traffic. Pull over safely and have it towed. Verify with a mechanic or dealer.

DIY or shop?

Dealer. It's high-voltage work and covered by the recall.

Recalls, bulletins and complaints in plain words

• Recall 24V868 (2022–2024 IONIQ 5, 2023–2025 IONIQ 6, GV60, GV70 Electrified and G80 Electrified): the ICCU may be damaged and stop charging the 12-volt battery, which can result in a loss of drive power. Dealers inspect and replace the ICCU and its fuse as needed and update the ICCU software. If your car is part of this recall, the dealer fixes it for free.
• Recall 24V204: the earlier version of the same recall. NHTSA says it was replaced by 24V868, and cars already repaired under it need the new remedy.
• NHTSA complaints: 23 keyword-matched complaints for Genesis GV60 2023–2025 (of 77 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-20; keywords: iccu, 12v, 12 volt, power supply, loss of (drive, motive, power), lost (power, propulsion), pop, charging unit, stop safely, limp).

What owners report

• In ICCU failure, 12V battery died 4 days later on Genesis Owners, a 2023 GV60 owner heard a pop and got a 'check electric vehicle system' warning. Four days later the car showed '12V battery voltage low. Stop safely' and lost all power. The ICCU was backordered about a month, the 12V battery was also replaced, and the owner needed the physical key. Another owner said their car failed two weeks after the recall work.
• In GV60 STOP VEHICLE & CHECK POWER SUPPLY on Genesis Owners, an owner heard a pop from the back, got an EV warning and then 'STOP VEHICLE & CHECK POWER SUPPLY' with limp mode. The fix was a new ICCU, new fuses and newer software.

My take

My advice as a former pre-purchase inspector: on any used Hyundai or Genesis EV from these years, I ask for the recall paperwork showing the 24V868 work, not just the older one. No paperwork, and I'd have the dealer check the VIN before money changes hands.

Vehicle focus: 2023–2025 Genesis GV60 (the same recall covers the IONIQ 5, IONIQ 6, GV70 Electrified and G80 Electrified).

Safety / mechanic note

An ICCU failure can shut the car down in traffic. Verify with a mechanic.