Why does the 12V battery keep dying on my new Toyota Land Cruiser?

Short answer: Owners of 2024-2027 Land Cruisers report the 12V dying after a few days parked. Fixes so far include warranty battery replacements after Toyota found a bad cell, and ruling out dealer-installed add-ons like rust modules. Ask the dealer for a battery test and a parasitic draw test, and use a maintainer if the truck sits.

Symptom: After sitting a few days the truck won't unlock or start, or it stalls or shows warnings, even with a newer battery.

What to check first

1. Have the 12V battery load-tested at the dealer, and don't charge it right before so they can see the problem.
2. Ask for a parasitic draw test.
3. List any dealer-installed electrical add-ons, like rust modules or dash cams, and ask to disconnect them.
4. Avoid long sessions in ACC mode.
5. Use a battery maintainer if it will sit a week or more.
6. Run your VIN at nhtsa.gov/recalls.

Likely causes

1. Defective factory 12V battery. One owner said Toyota found a bad cell in the battery twice and replaced it under warranty each time. The 12V battery is the small battery that powers the computers, locks and screens. EVs and hybrids still need it to wake up, even with a full main battery.
2. Not enough charging between drives. Owners report the battery dying when the truck sits five days or more, or after time in accessory (ACC) mode, which runs things without charging the 12V. The hybrid system only charges it while the truck is on.
3. Dealer-installed electrical add-ons. Some trucks had dealer-installed accessories such as an electronic rust-protection module or dash cam. Owners suggested unplugging them first to rule out a parasitic drain, meaning something drawing power with the truck off.

What it usually costs

Owners report batteries replaced under warranty. Owners didn't post prices for testing or add-on removal.

Is it safe to keep driving?

A dead 12V won't hurt you, but stalling while driving is dangerous. If it stalls, get it to the dealer.

DIY or shop?

A maintainer and jump pack are DIY. Draw testing and removing add-ons are dealer work.

Recalls, bulletins and complaints in plain words

• Recalls: NHTSA lists 5 recalls for the 2024-2027 Land Cruiser, and none are about the 12V battery or charging. 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: 12 keyword-matched complaints for Toyota Land Cruiser 2024–2027 (of 81 unique complaints queried, NHTSA complaints API by model year, queried 2026-11-01; keywords: 12v, 12 volt, battery, dead, jump, stall, won t start, no start, electrical). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In Another Owner With A Dead Battery… on Reddit r/LandCruiser250, a 2027 Premium owner with 3,000 miles found the truck dead after it sat for about four days. Another 2027 owner said theirs dies if left more than five days and drains quickly in ACC mode, while some 2025 owners had never seen it.
• In Those With Battery Issues on Reddit r/LandCruiser250, an owner whose new 2027 died shortly after purchase was told by another owner that Toyota found a bad battery cell twice, at 700 and 1,800 miles, and replaced it under warranty each time. That owner advised not to charge the battery before the dealer visit so the dealer sees the problem.
• In My 2-month-old 2027 Land Cruiser is dead AGAIN — even after a new battery and another week at Toyota on Reddit r/LandCruiser250, an owner's two-month-old 2027 had a dead 12V at least four times, even after a new battery and a week at Toyota. Replies suggested a parasitic draw test and disconnecting the dealer-installed rust module and dash cam to rule them out, and some said aftermarket batteries worked better.
• In My New Land Cruiser 250 Still Stalls Even After Replacing the 12V Battery on Reddit r/LandCruiser250, a June 2026 buyer's Land Cruiser kept dying and stalling even after a new 12V. Other owners asked whether the dealer-installed aftermarket electrical accessory had been removed, and suggested a trickle charger and checking the state lemon law.

Quick tip

If a new battery dies again, ask what's still connected. Factory and dealer add-ons are the first thing to rule out.

Vehicle focus: Toyota Land Cruiser (250 series, i-FORCE MAX hybrid), 2024-2027.

Safety / mechanic note

Stalling in traffic is a safety issue. Verify with a mechanic.