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2025 4Runner Transmission Overheating on Climbs Off-Road

AdFour

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For those that have issues, has anyone done a survey between Hybrid and NON? Ive seen a lot of hybrids reporting this. Wondering is there any diff with the increased torque?
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JuliusBrown

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2025 OR Premium Hybrid - Anybody else having problems with their transmission overheating on offroad climbs? And if so, what have you done to fix it? Transmission temperature is normal and shifts normally on paved mountain highways but overheats on off-road climbs (medium-long) - anything over about 600m (~2000ft) vertical. I've had warning lights come on twice and now monitor the transmission temperature on climbs and stop for a couple minutes then continue once the transmission cools. I'm not towing or carrying anything. Dry conditions. I know some Tacomas were having this issue.
Took my 2025 4Runner TRD Offroad out yesterday to Slaughterhouse Gulch near Bailey CO, and after several steep hill climbs in 4Hi (drive mode) the transmission oil temp light went on and I lost power. I had to stop for 4 minutes to let it cool then switch to 4Lo. It was my mistake to do multiple hill climbs in 4Hi, I should have been in 4Lo. I've also heard manual (s-mode) reduces temp as well (compared to drive mode which shifts between 1st & 2nd often).
 
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