OFFICIAL: MY22+ Toyota Tundra - Throttle Lag/Hesitation From Stop Issue(s) - T-SB-0111-22

This is helpful, thank you. I clearly was using this wrong to determine gear. I wonder if an OBD2 reader like Carista will allow me to log gears? I'll look into it. Thanks again for the education.

 

ok, a few things you can try as Im not sure on your miles yet.

the lag thing (dead pedal) is just that way it is and this is only from time to time, more from a rolling stop, this is NOT turbo lag.

make sure your trans is fully warmed up before expecting it to operate at peak, it takes a WHILE if you watch the gauges.

if you want faster or more aggressive shifting, try sport or sport+, if thats not enough try tow+

give things some time to get worn in if you have a brand new truck, and take it where you can safely go and after its broke in and warmed up give it 3-4 WOTs and let it rip, this will clean most of that "bad learning" up.

 

mmmmmmmm. tow+

 

hell ya, I was only recently turned onto that as I have a smaller trailer and was only using tow, not tow+.

I didnt realize the it unleashes the beast with no torque management, I put it on and was like HOLY SHIT, it makes my yota 350 2016 truck seem like a 4 banger for off the line with low RPM torque.

I call it raped ape mode.

 

I think what you are describing might be similar to what this guy is talking about at 13 mins:

https://youtu.be/S4LBSu3lJUU?t=786

My take it seems to be a side affect of the newer TCU Calibrations that it revs up to 2k on a start. Note this isn't the dead peal thing I was experiencing before the TCU update, the engine wouldn't rev up when I had that. Now it revs up right away for me.

I don't know what the stall speed on the Converter is, but also the 1st gear is really tall at 4.92:1 so the final drive ratio is 8.22:1. I almost think starting out in 2nd might actually be a smoother experience than dropping into 1st gear in many condtions.

 

so how does the newer TCU cal from the recall work in relation to this, I still havent got mine done yet.

 

First off Toyota officially only says this addresses a condition where the vehicle can move while in neutral.

My experience was that after the update the truck was very jerky starting out for about 10 or so drive cycles which was similar to when I got the truck brand new, but never had any dead pedal condition. After about 20 drive cycles it seems to start out much smoother. Even trying to force conditions where it would be jerky/laggy it seems a lot smoother. Mostly due to better adaptation from me now that I can trust it to go when I press the pedal.

It does rev up to 2k like that but I don't personally feel anything is wrong or unpredictable.

I don't log any data right now because it seems like the truck is working properly but if I see the issue return I can compare to when it was good to see if anything changed.

 

are you still getting way less or no dead pedal like you stated previously?

 

Yes, the small delays I see seem to be the ecu initially opens the throttle then limits it for 200 ms or so then allows throttle again. But zero large delays where the throttle is left at idle.

So there is delays but they are smaller and predictable.

 

Yes, this is it exactly. Too many people are confusing this issue with the “dead pedal” and “turbo lag” which was solved mid 2022. Dead pedal is so hard to recreate it’s almost gone quiet. But yes, this delay in acceleration up to about 2500 rpm’s is the problem. The truck runs very loud as it tries to get those rpm’s up. God help us if we encounter a hill from a stop. I just don’t know what it is. Here’s another theory over on a Facebook group.

 

Seems pretty plausible to me. Seems like mine learned the right thing currently so I'm trying not to touch things. I do this some ECU refinements are needed in addition to TCU.

 

You’re right, not new. However this video does a great job explaining and showing the issue.

 

I just had my neutral position recall completed earlier today (below).
Name: 24TA02 - SAFETY RECALL 24TA02 - CERTAIN MODEL YEAR 2022 - 2024 TUNDRA HV AND CERTAIN MODEL YEAR 2023 - 2024 SEQUOIA - VEHICLE MAY MOVE WHILE IN NEUTRAL POSITION

I also requested the TCU calibration 8A2100C03500 with justification as MY22+ Toyota Tundra - Throttle Lag/Hesitation From Stop Issue(s) - T-SB-0111-22.

I got my truck back, the report indicated that the 24TA02 was completed, however that I did not require the TCU calibration 8A2100C03500 (already completed).

I ran Carista and lo and behold! 3500. Sweet that it is included in the 24TA02. I was disappointed to learn that the 23TA09 risk of fire recall is STILL not available. I had the temporary remedy installed. Man we have a lot of recalls on our trucks. Why does it show as an active recall if not yet available? 23TA09 - SAFETY RECALL 23TA09 (REMEDY NOTICE ) - CERTAIN MODEL YEAR 2022- 2023 TUNDRA AND TUNDRA HV - INCREASED RISK OF FIRE

Transmission
Calibration ID: 8A2100C03500
Calibration ID: 895386002000

When I ran Carista, I saw 3 OBD2 faults. U0101- lost communication with TCM. U0129 lost communication with brake system control module. U0155 Lost communication with instrument panel cluster control module. I tried to clear them but "faults were successfully reset, but came back". Your thoughts appreciated. So far the 8A2100C03500 is running well. Will report back after I drive for a bit.

 

Those codes seem like normal history codes that were generated when those calibrations were updated on those modules, the modules reset and the coms were lost. I'm not familiar with carista but make sure its clearing history codes not just the active ones. Regardless if there is no errors on the dash they are history codes.

Only the latest calibration is available in GTS so there was no need to ask them look at multiple TSB's.

 

Thank you @rlc177! My first reaction to the new programming is “wow”. Responsiveness and torque is greatly enhanced on normal (not even using sport or Tow/Tow+) mode. This may be due to the relearning period. I hope that my truck stays this way!

There is still a delay from full stop (at a light for example) however it is less than before. Glad to be updated to this latest calibration.

I asked them for the 3500 TSB b/c it was so challenging to have them update me to 3400 last time Glad this recall took care of everything at once.

RLC I have a question for you. A vehicle accessory manufacturer (I won’t mention the name) mentioned that it’s important to remove all loggers, pedal enhancers etc prior to bringing any vehicle into the dealership. This is to ensure that no warranty denial issues occur.

The challenge is that installing and running wiring etc is not only time consuming but in some cases I am hoping to actually make some installs permanent (mounting to dash etc).

Isn’t it our perogative to modify our own vehicles w/o running into warranty issues? Wondering if I can still bring my vehicle in for recalls and service if I have any third party OBDII items installed. Or: if unplugged (but wiring still in place up to dash etc), is that an issue for Toy dealerships?

 

Thanks Ryan, is this something I should ask my dealership about before bringing in my vehicle with something installed?

 

Mine has progressively become worse to the point where I'm too scared to drive it. Has anyone been able to get Toyota to fix the problem? If so, what can I tell them to do exactly instead of just trying to describe it, last time I told them, they claimed it was normal.

 

Can you share your current TCM numbers? You can generate these using Carista. You may not have the latest updates. As Ryan indicated, things have improved (quite a lot) over the past months however it is not perfect. I am quite happy with the combination of the latest Toyota updates, and using Tow mode (or tow+ when actually towing) together with a Banks pedal monster and idash. Note the idash is not required however I recommend it.

 

I had a service done last week where they did that update. It almost feels like it's worse after the update. I tried it in sports mode as well, even though it is less it's still a hazard.

 

I haven't through manual shifting

 

Thanks all, does anyone use the Pedal Commander, I've read good and bad things about it and not sure if it voids warranty.

 

Good to know

 

I've seen some delays but now it seems to be tied to steering angles. Between having the steering wheel turned between 25 and 90 degrees and the normal conditions of a rolling stop.

I believe the tuners out there are working with new software right now developing tunes for this new generation ECU, so its possible in a few months you may be able to work with a 3rd party tuner to help tweak the logic a bit if you want to go down that route.

 

I experience same lag as others, yet sometimes the throttle is so touchy my head snaps back like I mashed the pedal. It’s like Jekyll and Hyde, and I never know which throttle response I’ll get. Rolling stops seem to help…

 

Any info on who is releasing or who to follow for more info (i.e. dyno vids etc.)? Excited to hear about this!

 

Will it void the warranty?

 

Yes voids warranty. Running 3rd party tunes on 3rd gen taco's though became pretty common and most tunes out there focused on drivability issues rather than pushing the motor beyond its limits.

Its something between you and a tune provider and your own personal acceptance of risk.

 

Haven't gone through all pages in this post but found a good workaround, shifting the gear lever into "S" prevents auto shut off and eliminates any lag, then just shift back to "D" once you get going, even when not in Sports or Tow mode.

 

Mine is irrelevant to auto start/stop. It’s a throttle response issue.

 

Technically nothing will automatically "void" a warranty. The manufacturer has to demonstrate that the modification you made to the vehicle resulted in the whatever you're claiming under warranty. So if you tune the vehicle and then there's a problem with your brakes, it will be hard for them to deny the warranty claim based upon the tune. But if you were to have an engine issue, it would be relatively easy for them to deny the warranty claim.