2023 Transmission question
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Mountain Pass
Joined: Dec 2023
Posts: 169
Likes: 61
2023 Transmission question
Hey all. Question… My 2023 F350 DRW 10 speed 6.7 HO is doing some weird stuff the last couple days. Like twice when I put it in drive it jolted hard forward. Not done it since. But today I was in park in school pickup line and had just started the truck. The lady in front of me wasn’t going forward or paying attention so I gave it a tiny rev while in Park to get her to pay attention. The truck surged forward a little and settled back. It didn’t move really. Just felt like it rocked front to back like someone tapped you from behind. Not the normal side to side when you rev something. Thoughts? It’s going to the dealer on the morning just wondering if anyone else had this happen.
Fleet Mechanic
Joined: Dec 2012
Posts: 1,566
Likes: 537
From: DFW
Yep - my ‘23 does this too. I think it’s the electronic start assist kicking in, like when it holds the brake on a hill, so you don’t roll backwards. But I don’t know, it was weird when I noticed it the first time but I just chalk it up to the electronic TCM. I don’t think there’s anything wrong with it.
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Mountain Pass
Joined: Dec 2023
Posts: 169
Likes: 61
Yep - my ‘23 does this too. I think it’s the electronic start assist kicking in, like when it holds the brake on a hill, so you don’t roll backwards. But I don’t know, it was weird when I noticed it the first time but I just chalk it up to the electronic TCM. I don’t think there’s anything wrong with it.
Fleet Mechanic
Joined: Dec 2012
Posts: 1,566
Likes: 537
From: DFW
Yep - sitting in park, just a quick rev on the accelerator and it will do exactly what you described. It produces a little bump, not enough to move the tires, but then a little bump to resettle it. It's kinda weird. Not weird enough for me to take it back to the dealer yet. I'm chalking it up to electronics right now. I've tested it a few times and it's there, can be replicated, if it turns into an issue, I'll pursue a diagnosis. I have 17k on the clock now.
Tuned
Joined: Jul 2006
Posts: 387
Likes: 173
From: Stafford, VA
I've had the same thing happen, sudden lurch like it takes just a few seconds to engage. Never going to be able to reproduce at the dealership. Only happened once or twice with about 9,000 miles on it. I've slowly started to build a collection of videos for the stupid door handles that won't unlock on the first touch or pull. No other way to prove it's happening with some of these things.
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Fleet Mechanic
Joined: Dec 2012
Posts: 1,566
Likes: 537
From: DFW
I would've guessed that. My dealership is about an hour away. The truck would be nice, warm, and smooth by the time I got to the service dept. I tried to replicate it today, but of course, it's 90 degrees outside and I had already been driving the truck for quite a while. I will say, if it gives you any assurance, I've towed quite a bit so far and it's been very nice - no issues at all. I wouldn't think twice about hooking up and hitting the road.
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Tuned
Joined: Jul 2006
Posts: 387
Likes: 173
From: Stafford, VA
Exactly, drive it, and if something happens, you've got it on record. I'm thinking back, and I would agree that mine occurred in the driveway, which meant cold(ish) and within a few miles, never when warmed up.
Laughing Gas
Joined: Aug 2021
Posts: 910
Likes: 508
My ‘22 with a little under 10k occasionally does weird stuff too:
Once in a while the 1-3 shift is really hard. To the point that last time it happened I checked the rearview mirror to see if I got tapped by another vehicle.
Today I was merging in traffic and stepped on the accelerator and the tach went to almost 4k but the truck didn’t increase speed. This is the second time it happened and in the same place just after getting off the highway. It is like the transmission is in neural when this happens. Makes me wonder about the torque converter
It also lurches back at start up, worse when cold. There is no one in the truck in the video. I remote started it.
It’s been to the dealer once for the hard shift and I got a CND. I’m going to make an app I with another dealer when I get a chance to see if they can find anything. It’s tough as it happens occasionally and I can’t get it to replicate so I can understand the CND. Intermittent stuff is a real bitch to diagnose.
Bob
Once in a while the 1-3 shift is really hard. To the point that last time it happened I checked the rearview mirror to see if I got tapped by another vehicle.
Today I was merging in traffic and stepped on the accelerator and the tach went to almost 4k but the truck didn’t increase speed. This is the second time it happened and in the same place just after getting off the highway. It is like the transmission is in neural when this happens. Makes me wonder about the torque converter
It also lurches back at start up, worse when cold. There is no one in the truck in the video. I remote started it.
It’s been to the dealer once for the hard shift and I got a CND. I’m going to make an app I with another dealer when I get a chance to see if they can find anything. It’s tough as it happens occasionally and I can’t get it to replicate so I can understand the CND. Intermittent stuff is a real bitch to diagnose.
Bob
Fleet Mechanic
Joined: Dec 2012
Posts: 1,566
Likes: 537
From: DFW
My ‘22 with a little under 10k occasionally does weird stuff too:
Once in a while the 1-3 shift is really hard. To the point that last time it happened I checked the rearview mirror to see if I got tapped by another vehicle.
Today I was merging in traffic and stepped on the accelerator and the tach went to almost 4k but the truck didn’t increase speed. This is the second time it happened and in the same place just after getting off the highway. It is like the transmission is in neural when this happens. Makes me wonder about the torque converter
It also lurches back at start up, worse when cold. There is no one in the truck in the video. I remote started it.
It’s been to the dealer once for the hard shift and I got a CND. I’m going to make an app I with another dealer when I get a chance to see if they can find anything. It’s tough as it happens occasionally and I can’t get it to replicate so I can understand the CND. Intermittent stuff is a real bitch to diagnose.
Bob
Once in a while the 1-3 shift is really hard. To the point that last time it happened I checked the rearview mirror to see if I got tapped by another vehicle.
Today I was merging in traffic and stepped on the accelerator and the tach went to almost 4k but the truck didn’t increase speed. This is the second time it happened and in the same place just after getting off the highway. It is like the transmission is in neural when this happens. Makes me wonder about the torque converter
It also lurches back at start up, worse when cold. There is no one in the truck in the video. I remote started it.
It’s been to the dealer once for the hard shift and I got a CND. I’m going to make an app I with another dealer when I get a chance to see if they can find anything. It’s tough as it happens occasionally and I can’t get it to replicate so I can understand the CND. Intermittent stuff is a real bitch to diagnose.
Bob
Laughing Gas
Joined: Aug 2021
Posts: 910
Likes: 508
That video @HorizontalHunter is exactly what it's doing - and what the OP was claiming. A perfect little 10 second insert - thanks for sharing.
I don’t generally set the emergency brake, unless needed like on a hill, so whatever this is the energy can dissipate in motion instead of stressing driveline components.
Bob
Mountain Pass
Joined: Oct 2014
Posts: 225
Likes: 82
I suspect that with cooler, therefore thicker, transmission fluid, there is enough 'friction' in the transmission for it to push a little, even though in Park the clutches are released.
Regarding the difference between at school and the dealership, there are two possibilities I would consider:
The first could be the angle of the parking lots-if you are on a slight hill it could 'preload' the driveline in the same direction the friction would push, or in the opposite direction. One way would not move, since the parking pawl would already be holding it in place.
The other possibility is that at the dealer the fluid was warm, so it did not provide that friction.
Regarding the difference between at school and the dealership, there are two possibilities I would consider:
The first could be the angle of the parking lots-if you are on a slight hill it could 'preload' the driveline in the same direction the friction would push, or in the opposite direction. One way would not move, since the parking pawl would already be holding it in place.
The other possibility is that at the dealer the fluid was warm, so it did not provide that friction.
Thread Starter
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Mountain Pass
Joined: Dec 2023
Posts: 169
Likes: 61
I suspect that with cooler, therefore thicker, transmission fluid, there is enough 'friction' in the transmission for it to push a little, even though in Park the clutches are released.
Regarding the difference between at school and the dealership, there are two possibilities I would consider:
The first could be the angle of the parking lots-if you are on a slight hill it could 'preload' the driveline in the same direction the friction would push, or in the opposite direction. One way would not move, since the parking pawl would already be holding it in place.
The other possibility is that at the dealer the fluid was warm, so it did not provide that friction.
Regarding the difference between at school and the dealership, there are two possibilities I would consider:
The first could be the angle of the parking lots-if you are on a slight hill it could 'preload' the driveline in the same direction the friction would push, or in the opposite direction. One way would not move, since the parking pawl would already be holding it in place.
The other possibility is that at the dealer the fluid was warm, so it did not provide that friction.
Logistics Pro
Joined: May 2022
Posts: 4,285
Likes: 2,416
From: Everywhere and nowhere
Before the pump seal was replaced on my 2022 it lurched just like the video EVERY time it was cold. My truck was built post-CDF drum update but also had a leak. The fluid could have been slightly low but since replacing the pump seal it hasn't done it again.