Thx for the clarification. I’ll look for that in park lurch in my truck. I see the issue in your clip, seems as if the transmission is pressurized in park right after starting the engine.

 

Happened to me this morning, usually remote start so I don’t notice it. Another weird transmission quark, although it’s been pretty smooth lately.

 

Mine does this if I don’t wait a few minutes to put it in gear. Seems to do it more when I put in reverse to leave work if I don’t remote start it, which I seldom do this time of year.

 

Mine does it.

 

A 2022 should have the updated CDF drum.

 

I've watched that video a dozen times. My conclusion is, the truck is holding the brakes while it starts and the tiny bit of roll is an effect of the e-brake releasing. First clue, it is happening AFTER the engine is running.

Mine has never done anything like that. I rarely remote start. I don't see how you would even know it if you are in the cab pushing the button, since your foot has to be on the service brake.

Who has a key ignition and has seen this happen when cranking? I assume even with those your foot has to be on the service brake, but I have not tried one so could be wrong. I miss the days when I could reach through the window and start the engine.

 

Mine is a 22 which still had manual parking brake, which i don’t engage sitting in the garage. It also doesn’t do it all the time. As far as the foot on the brake when starting I just push it down enough to start, not to hold the truck. I do agree with not being able reach in and start through the window. I sometimes push the brake down with my hand to start.

 

The truck is not holding the brakes, and the e-brake is not engage. Electric parking brakes are slow and noisy anyways.
And you can start a key ignition truck without your foot on the brake.

 

Thiis.

Mine is a key ignition and I don’t set the parking brake as I park on level ground, plus I want that energy to dissipate through the rolling of the wheel vs having the parking brake on and stressing the driveline.

Bob

 

Does a '22 have hill start assist? Or did that start in '23? I'm still thinking it is brake holding then releasing. Not e-brake. But the same brake system as the hill start assist, reverse brake assist, and whatever other nanny stuff. I assume part of the ABS.

It's not the transmission. If it was it would do it as soon as the starter turned the crank. Not 2 seconds later.

 

My 2021 Godzilla does it but only to the extent that I can feel it very slightly. I've never paid much attention to it since I've had farm tractors that do the exact same thing. Not that there is any correlation but and I probably am conditioned to feeling it. That said, I must say that the transmission shifts hard into either drive or reverse upon initial shift from park. I don't notice it after the initial gear selection following start-up.

 

It takes about that 2 seconds for the torque converter and fluid to spin up.

It’s not the brakes. They don’t randomly activate on startup…even if they did, how would it move the truck that has been sitting there stationary for hours or days on end?

 

Yes, it has hill start assist. I can feel it sitting in the cab as well. That’s what prompted me to get out and remote start it.

What perplexes me is that in Park/Neutral no hydraulic pressure should ever be applied to the transmission clutches so why the lurch back? It isn’t only in my drive way. It does it hot or cold. The colder the fluid is the more pronounced it is.

Where the truck is parked is dead flat and as you can see in the video it is rolling with some energy. I have owned a lot of vehicles over the years and never seen anything like this. It’s really strange.

The truck has a little over 10k on it. If that matters.

Thanks to all who have replied.

Bob

 

You can have some tension between the parking pawl and the rear diff out to the brakes. When you parked it, you were in gear (forward or reverse doesn't matter) and you were holding the brake as you shifted to park. That may leave torque on the driveline. When you start it again, the ABS system is holding pressure on the brakes (I'm thinking another nanny safety thing) for about 1 or 2 seconds.

This truck seems to be holding my brakes for me a lot for one reason or another. It isn't a stretch for me to think it is doing it while parked. Maybe your incline sensor thinks you are on a slight angle?

 

yes they should. I didnt see the OP state the MY anywhere thou.