Transmission overheating in 4HI when going uphill - Toyota's answer (or non-answer)

[Gfenza89]

Mine is smooth with the exception of the first cold shift or two… my BMW with the lauded ZF8 was the same way on a cold start. If your transmission is acting like that consistently then you have a problem.

Yeah I know…Toyota won’t even inspect the fluid for me, they sent an engineer FTS to the dealer and he said dropping the transmission would open a can of worms. What an absolute joke

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[Muckle]

Also having this issue. Both when towing a 1200lb trailer or just traveling forest roads while not towing anything and nothing in the bed.

I haven’t had it overheat and go into limp mode because I’ve stopped or just monitored it closely.

 

[BAQ717]

Also having this issue. Both when towing a 1200lb trailer or just traveling forest roads while not towing anything and nothing in the bed.

I haven’t had it overheat and go into limp mode because I’ve stopped or just monitored it closely.

No bueno. Too many people on here with the same issue for it to be an isolated issue. Hopefully everyone reports it to the dealer rather than just posting about it on here so Toyota is forced to take action.

 

[timetoeatpotatoes]

Also having this issue. Both when towing a 1200lb trailer or just traveling forest roads while not towing anything and nothing in the bed.

I haven’t had it overheat and go into limp mode because I’ve stopped or just monitored it closely.

somethings _gotta_ be going on.

 

[Lando]

Hmm, I’ve had zero issues with mine but I have not been in 4Hi going uphill. This is disconcerting if I need to be off road. I never had an issue with my old Chevys off road and I have climbed logging roads up mountains.

I would expect a TRD Off Road to be able to handle these situations as described without issue. Will be monitoring.

 

[JakeJoeBob]

Ive done some extensive up hill in hi with simliar loads and have not experienced this. However there is enough in this thread to suggest that something is going on.

Worth noting that the OTT tune will drop your transmission temps but I did my mountain overlanding trip before I got the tune. Not ideal to have to get a tune to fix the issue but just wanted to throw it out there as a possible solution.

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