2020 TACOMA WONT SHIFT OUT OF 3RD

2020 Tacoma won't shift past third gear on highway, problem occurs on cruise control @ 80 mph, will not shift past 3rd and will hold 5300rpms for many miles, tsb update has been done to truck, speedometer has been recalibrated, shift adaptives have been reset, pedal commander has been tried, does it weather ect is on or off. truck is slightly lifted on 33's every modification was put on by dealer before i purchased truck brand new, truck has been back to dealer 13 times, truck is still currently at dealer, problems started at 2500 miles, truck currently has 7100 miles i will attach link to youtube video of the problem and ill attach picture of truck, thank you for your help.

youtube video link here

https://youtu.be/KAGDk3NuuYY

 

a shot in the dark but maybe low transmission fluid? Seems to be a rampant problem.

https://www.tacomaworld.com/threads...be-low-on-fluid-directly-from-factory.405642/

 

33's? Regear? Headwind? I'd say normal.

 

33's, stock gear, headwind or not does it every day. every time dealer messed with computer problem would be resolved for about 500 miles so that tells me its not a problem with tires lift or gear.

 

Nothing on the far side of the torque curve and holding a steady speed should do that repeatably.

 

worth a shot indeed, just relayed that to dealer thank you

 

As he said it’s dealer modified on 33s

Definitely not normal

What sort of info have you got after your first 13 visits?

Not ok you’ve been strung along that many times.

 

Your spedo hasn't been corrected either right? So you're maybe doing 84 in that first video? I think it's normal.

 

if you quickly skim through the first post you'll read that the dealership will often just hookup the techstream scanner and bless it off which isn't close to actually checking it. Ask them to actually get down and dirty and do a proper fluid check. At the very least, them actually checking the fluid level will knock if off the list of a possible culprit

 

I really need to stfu. Working and being on here is not good lol. Apologies OP. I'll shut up.

 

correct that video is old, and was 84 but has since been re callibrated and is still doing exact same thing in exact same conditions at true 80mph

 

I know the feeling. This morning, I posted about the Taco Lean in a thud thread.

@Skydvrr

You smelled that out though.

 

By now they should’ve been knee deep in the valve body, but Toyota would probably rather swap in a new tranny to isolate the problem if normal troubleshooting hasn’t produced a culprit. They should at least know by now if it’s ECU related or an internal transmission issue.

I sure hope the fluid level has been verified by now.

Hope you get it solved OP, that’s a really nice looking truck.

 

thank you I appreciate it, I have gone as far as opening a TAS case with toyota corp, and they have yet to send a field rep out to look at truck, i have been getting major run around by dealer and toyota corp, I feel as if they dont want to touch the truck because of modifications, yet they were the ones who put everything on.

 

Remember they don’t have that luxury. That’s the beauty of your position. You paid a LOT of extra money to have those products selected and installed by Toyota trained techs.
You are more than justified in being a proverbial thorn in their side.

EDIT: does this only occur while cruise is on? Does it downshift if you approach another vehicle from behind (when using the radar cruise, not the old fashioned one)

 

Does it act goofy at posted limits too?

 

it will do it with cruise off but not as bad, and yes it will down shift if radar picks up a car in front of me, ive had several people say well dont use cruise, I do a 60 mile commute everyday so i love cruise lol along with i didnt spend 50k to not be able to use my cruise control lol

 

Stay helpful Bill, Christ

 

Video make me cringe.