My Hyundai Genesis is completely dead, no lights. Why does it come and go?

Short answer: When a Genesis sedan goes completely dead and then comes back, start with the battery and every connection: battery posts, cable ends and ground straps. Owners fixed it with a new battery, clean connections, or a full reset with the battery disconnected for about 15 minutes. On 2015-2016 cars, run the VIN: Hyundai recalled the starter solenoid because water can short it and cause a fire.

Symptom: You get in and nothing works, not even the door lights, or it won't start. Sometimes it works again 10 minutes later.

What to check first

1. Run your VIN at nhtsa.gov/recalls, especially 2015-2016 cars (starter solenoid recall 24V107000).
2. Measure battery voltage. About 12.6 volts at rest is healthy; well below 12 is weak.
3. Clean and tighten the battery posts, cable ends and ground straps.
4. Disconnect the battery for about 15 minutes to reset the computers.
5. Get the codes read if the check engine light comes on.

Likely causes

1. Dead or failing battery. A battery that reads well below 12 volts can't run anything. One owner's original battery measured 5.5 volts.
2. Loose or corroded battery terminals or grounds. Grounds are the cables that bolt the electrical system to the body and engine. A bad connection makes the car go dead, then work again a few minutes later.
3. Electronics that need a reset. Disconnecting the battery for a while lets the computers fully restart.
4. Starter solenoid water damage (recall). 2015-2016 Genesis sedans are recalled because water can get into the starter solenoid and short it.

What it usually costs

Owners in these threads didn't post prices.

Is it safe to keep driving?

A car that goes dead is a stranding risk, not usually a crash risk. A loud pop, burning smell or smoke is different: stop using it and get it checked, and check the solenoid fire recall.

DIY or shop?

Battery, terminals, grounds and a reset are DIY. Starter and wiring repairs are usually shop work.

Recalls, bulletins and complaints in plain words

• Related recalls: NHTSA lists 24V107000 for 2015-2016 Genesis sedans and later Genesis models: water can get into the starter solenoid and short it, which can cause an engine compartment fire while parked or driving. It also lists 15V097000 (2015: water in the rear lamps can cause a wrong gear display) and 16V575000 (some 2015 instrument clusters). Check your VIN at nhtsa.gov/recalls. If your car is part of a recall, the dealer fixes it for free.
• Plain words: The complaint count below shows how often owners reported problems that mention these words to NHTSA. A count is not proof of a defect.
• NHTSA complaints: 336 keyword-matched complaints for Hyundai Genesis sedan 2009–2016 (of 1427 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-30; keywords: dead battery, battery, no power, won t start, electrical) (NHTSA returned no data for 2 model-year queries). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In 2016 Hyundai Genesis - Won't start on Car Talk, a used 2016 Genesis went completely dead with no lights, and roadside said the original battery was at 5.5 volts. A few days after a new battery, there was a loud pop. Another 2016 owner's car went dead and came back after the battery cables were touched together, resetting the computers. Members suggested disconnecting the battery for 15 minutes and cleaning the grounds.
• In 2009 Hyundai Genesis - Intermittent dead on Car Talk, a 2009 Genesis was sometimes completely dead, not even door lights, and worked again 10 minutes later. The battery was new and tested. A member suspected the battery posts and cable ends needed cleaning.
• In 2011 Hyundai Genesis won't start on Car Talk, a 2011 Genesis wouldn't start now and then, the mechanic found nothing, and then the check engine light came on. A member said to have the codes read.

Quick tip

Most 'random dead' cars are a connection problem. Clean every cable end and ground before you start replacing modules.

Vehicle focus: Hyundai Genesis sedan, 2009-2016 (not the Genesis Coupe).

Safety / mechanic note

Electrical shorts and fire risk are safety items. Verify with a mechanic.