High Rev When Coming to a Stop

Osceola

Tremor Fan
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Location
Orlando, FL
Current Rides #1
2021 F250 Tremor
My truck is currently in the dealership for an on-going issue and I am curious if anyone has this same problem. Yesterday was the 4th time this has happened. I have about 5,800 miles on the vehicle.

When coming to a stop and pressing the brake, the engine will begin to rev up from 1500 to 3500 rpm. The only way to stop it is to release the brake or shut off the engine. Putting the vehicle in park makes it worse.

The first 3 times this happened I was able to stop the vehicle from moving by pressing the brake, although you could tell the engine wanted to push the vehicle forward. But as I mentioned, to stop the high rev you have to release the brake. A little nerve-racking to say the least. This all happened within the first 3,000 miles. I took it to the dealer but they could not find an error code or computer log.

Well yesterday it did it again. This was the first time in about 2,000 miles. This time the vehicle lurched forward about 4 feet. I immediately took it to the dealer and they are now evaluating it. This last time it really scared me because the brake did not hold the vehicle from moving forward. If someone had been in front of me, vehicle or pedestrian, I would have hit them.

To me, It feels like the engine is revving to match the transmission gear but instead of dropping to a lower gear the computer is telling the engine to rev higher to match the current gear. And now that the gas pedal, break pedal and transmission is all electronically controlled I am not sure where Ford will even begin. As I mentioned, the only way to stop the high rev is to release the brake. This is contrary to all instinct that tells you to hit the brake when the engine wants to rev higher and move forward when in reality you want to come to a stop.
 
  • Wow
Reactions: ccw
I've noticed similar with my 6.7L as well. When braking at parking lot speeds, it seems the engine isnt cutting power and dropping RPMs like it should.
 
Sounds very strange indeed. I haven't experienced this - I hope they get to the bottom of your issue. Please keep us posted on what they find.
 
Definitely a strange phenomenon.
It sounds like the TPS is wired to the brake lights......sorry.
Does sound dangerous and hope they find the culprit.
 
Especially weird that it waited so long to manifest! That's creepy!
 
Based on the frequency, do you believe it's possible the increased revs are coinciding with an active regen process? It seems the operational logic behind a mandatory regen could align with revs increasing when fully stopped/brake applied, and increasing further when placed in park. It would also seem to align with the behavior of continuing to run at increased revs unless the brake is released, or the engine turned off.
 
My truck is currently in the dealership for an on-going issue and I am curious if anyone has this same problem. Yesterday was the 4th time this has happened. I have about 5,800 miles on the vehicle.

When coming to a stop and pressing the brake, the engine will begin to rev up from 1500 to 3500 rpm. The only way to stop it is to release the brake or shut off the engine. Putting the vehicle in park makes it worse.

The first 3 times this happened I was able to stop the vehicle from moving by pressing the brake, although you could tell the engine wanted to push the vehicle forward. But as I mentioned, to stop the high rev you have to release the brake. A little nerve-racking to say the least. This all happened within the first 3,000 miles. I took it to the dealer but they could not find an error code or computer log.

Well yesterday it did it again. This was the first time in about 2,000 miles. This time the vehicle lurched forward about 4 feet. I immediately took it to the dealer and they are now evaluating it. This last time it really scared me because the brake did not hold the vehicle from moving forward. If someone had been in front of me, vehicle or pedestrian, I would have hit them.

To me, It feels like the engine is revving to match the transmission gear but instead of dropping to a lower gear the computer is telling the engine to rev higher to match the current gear. And now that the gas pedal, break pedal and transmission is all electronically controlled I am not sure where Ford will even begin. As I mentioned, the only way to stop the high rev is to release the brake. This is contrary to all instinct that tells you to hit the brake when the engine wants to rev higher and move forward when in reality you want to come to a stop.
There was a law suit in the mid 90’s Ford Taurus had this same defect. Can’t remember what fixed the problem but Ford has had this issue in the past .
 
Based on the frequency, do you believe it's possible the increased revs are coinciding with an active regen process? It seems the operational logic behind a mandatory regen could align with revs increasing when fully stopped/brake applied, and increasing further when placed in park. It would also seem to align with the behavior of continuing to run at increased revs unless the brake is released, or the engine turned off.
I thought about that but I've been able to tell the few times it's done the regen (by the smell) and I don't recall it being in the timeframe that this issue has happened.

Here's a video I just happened to capture as I was pulling into a parking space. Forgive the audio and my excitement. I was just happy to catch it on video and had a friend in the truck. This was the 3rd time it happened and it was back in January.


Notice it's in first gear, stopped, my foot is on the brake, and it's revving at about 1500. I put it in park and it increases to about 3500. finally when I release the brake it stops.
 
I thought about that but I've been able to tell the few times it's done the regen (by the smell) and I don't recall it being in the timeframe that this issue has happened.

Here's a video I just happened to capture as I was pulling into a parking space. Forgive the audio and my excitement. I was just happy to catch it on video and had a friend in the truck. This was the 3rd time it happened and it was back in January.


Notice it's in first gear, stopped, my foot is on the brake, and it's revving at about 1500. I put it in park and it increases to about 3500. finally when I release the brake it stops.
Thanks for the video - that is really helpful. So, even while in gear and moving at ~4-5MPH with brake applied, it's attempting to increase RPM (traction control blinking). Shifting to park then results in a spontaneous RPM jump to ~3100 RPM for a second before it returns to normal idle RPM. I'd say that likely rules out any correlation with an active regen. Very concerning behavior.
 
Definitely a strange phenomenon.
It sounds like the TPS is wired to the brake lights......sorry.
Does sound dangerous and hope they find the culprit.
TPS wired to the brake lights.. :ROFLMAO:
Somebody was really thinking outside the box.
 
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