Why does my Toyota Tundra iForce Max get a hybrid battery cooling warning?

Short answer: The iForce Max hybrid battery is cooled by cabin air under the rear seat, so very hot cabins and clogged filters can trigger a cooling warning. Clean or replace the filters, use a sunshade, and run the A/C before driving. If it still comes back, have the dealer check the battery fan and sensors under warranty.

Symptom: A hybrid or traction battery cooling warning appears on hot days, sometimes with reduced power.

What to check first

1. Clean or replace the hybrid battery cooling filters under the rear seat.
2. Make sure nothing blocks the cabin air vents for the battery.
3. Use a sunshade and cool the cabin before driving.
4. If the warning keeps returning, ask the dealer to check the battery fan and sensors.
5. Run your VIN at nhtsa.gov/recalls. Owners say the V35A engine recall doesn't cover the hybrid, but verify yours by VIN.

Likely causes

1. Hybrid battery running hot. The iForce Max hybrid battery sits under the rear seat and is cooled with cabin air. In very hot weather it can overheat.
2. Clogged cooling filters. Owners clean and replace the filters under the rear seat to help cooling.
3. Cooling fan or sensor fault. If the warning keeps returning with clean filters, the fan or a sensor may need checking.

What it usually costs

Owners didn't post prices. Filter cleaning is free. Warranty should cover a faulty fan or sensor.

Is it safe to keep driving?

Usually yes, but the truck may limit power to protect the battery. Get it checked if the warning keeps coming back.

DIY or shop?

Cleaning filters is DIY. Fan, sensor and battery work is dealer work.

Recalls, bulletins and complaints in plain words

• Related recalls: NHTSA lists V35A engine recalls 24V381000 (2022-2023 Tundra), 25V767000 (2022-2024 Tundra) and 26V320000 (2024 Tundra) for machining debris that can damage engine bearings. Owners say the iForce Max hybrid isn't included, but check your VIN. 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: 412 keyword-matched complaints for Toyota Tundra and Tundra Hybrid 2022–2025 (of 1345 unique complaints queried, NHTSA complaints API by model year, queried 2026-11-03; keywords: hybrid, rough, cold start, misfire, stall, traction, cooling, iforce, i-force). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In Gen 3 iForce Max - traction cooling error on Reddit r/ToyotaTundra, a 2024 Tundra TRD Pro hybrid owner at about 39,000 miles got a traction battery cooling error on hot afternoons in Georgia. They cleaned and replaced the filters under the rear seat, but it still came back. Owners suggested using a sunshade and keeping the cabin cool.
• In Does 2024 Tundra TRD pro with iForce Max engine have issues? on Reddit r/ToyotaTundra, Tundra owners said the iForce Max hybrid isn't included in the V35A engine recall, and that hybrids only get engine repairs if the engine fails under warranty.

Quick tip

Clean filters and cool cabins prevent most of these warnings.

Vehicle focus: Toyota Tundra iForce Max hybrid, 2022-2025.

Safety / mechanic note

A hybrid's high-voltage system can stay live with the car off. Leave the orange cables and the big battery to a trained technician. Verify with a mechanic.