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Missed/Harsh Shifts and Warning Messages but no Codes

mackinnon654

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First Name
Tyler
Joined
Oct 4, 2023
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Location
Ontario Canada
Vehicles
23 f150 Lariat Supercrew long box
Hoping someone here may have experience with this issue as my dealership doesn't have a clue.

Truck is a 23 Lariat 5.0 6.5 Bed 4x4 3.31

Issue started around 5000 km casually accelerating and I believe is shifted from 5-6. I thought I got rear ended that how badly the truck jolted when the transmission shifted. A bunch of warning message and symbols appeared on the dash and disappeared as fast as they showed up. From what I can briefly see I catch the traction control symbol on the dash illuminated. I'm assuming it's disabling the stability/traction system.Truck drive absolutely normal after this like nothing happened. Took it in and the dealer says there are no fault codes stored in the PCM or TCM and to keep driving it. Similar issue happened at 6000 km. Then around 10000 km towing a trailer on cruise at approx 115 kmh the truck went to downshift, loud thud warning messages and cruise and tow/haul disabled. All messages go away abruptly and then things carried on as if it never happened.
This time the dealer reset the learning on the tranny when I took it in but still no codes... Almost exactly 8000 km after this (which I've been told is the TCM learning distance) similar issue downshift feels like it misses while in cruise control, warning lights come on then go away. This time the dealer updated the TCM. It's done this another 3 times since the update and it's finished another learning phase. Dealership says they can't find anything wrong...they say fluid level is fine, apparently no pan magnet to check on this truck either. They say they've never seen this before, but that's been the story with 2 other problems on this truck so I'm beginning to doubt their capabilities or their willingness to dig into the problem.

Can anyone help shed some light on this situation. I'm worried this issue is causing internal damage that could rear it's head out of warranty.
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