I was driving into work today and when I let off the throttle the rpm’s went up until I pressed on the brake, I noticed that my truck has been doing this quite a bit lately it’s not throwing any codes and the dealership says they can’t look at it unless it throws a code, I have a 2018 6.7. Has anyone else had this happen to them? Any ideas on what it could be? It feels almost like I’m driving in tow/haul mode but I’m not in tow/haul mode.

 

Your floor mat or a grapefruit or something is pushing on the throttle pedal. You can't have a disagreement between the throttle pedal and the throttle on the engine. If the computer sees these two separate values and they don't agree, the computer will put the engine into limp mode. This throttle strategy avoids unintentional accelerations. If this condition exists, it will for sure set a code. If something IS pushing on the throttle...the floor mat, a cat or your foot, and you step on the brake pedal, the computer goes into a BRAKE OVER THROTTLE setting, where the throttle electronically goes to zero as soon as you step on the brake. This throttle strategy too avoids unintentional acceleration. This situation will NOT set a code.

 

I’ll check to see if maybe the floor mat might be laying on the bottom of the throttle, never thought about that, boy will I feel dumb lol, I am not use to these new trucks and so far most every issue I’ve had has turned out to be me not knowing how the new vehicles operate lol, I miss the simplicity of the old vehicles lol

 

I get really nervous about this truck everything is run by computers and sensors and if something goes wrong I can’t just fix it on the side of the road and get to where I’m trying to go lol

 

Well, this brake over throttle has been around for a good 20 or so years, but I can understand that you would never have encountered it before now. And if it wasn't there, your truck, in its current condition, would be very dangerous to drive and might have driven you through the window of your local Taco Bell.

 

It might be something as simple as that and it might not be. The dealer told me that exact same thing will my 2013 f150 xlt. "Oh, you're an idiot, the floor mat is pushing the accelerator pedal" is what they told me. The truck was literally flooring itself and the brake pedal did not do anything, had to pop the stupid truck in neutral and watch it bang of the rev limiter for 2 minutes before it settled back down. My response to the dealer was what about the brake override safety feature? How come that didn't work? They just told me it's a flawless design and its built ford tough so it can't have a glitch, has to be the floor mat or your shoe. I removed the floor mat and but it in the box of the truck and said that'll I be back when it does it again. It did it 4 more times in the next 2 days. They had the truck for 3 weeks and said they had no idea what was wrong with it. Then the shop foreman came to open up in the morning and the alarm was going off. They tore the whole dash apart and finally found that all of the wires in the steering column were rubbed raw and that the cruise control was shorting out and causing it to think the cruise was set at governor. Lol. That silly thing almost got me into numerous accidents and the brake pedal did absolutely nothing, even pushing as hard as I could the truck would still accelerate, the only thing I could do was put it in neutral and watch it rev. It happened in the city and on the highway, when accelerating and decelerating. Those are the scariest moments I've had driving any vehicle. It's funny now but it definitely wasn't at the time. O hope you get it figured out and have a better dealer than I did. Don't let them push you around, keep on them if the issue still persists with the floor mat out or moved back further. Best of luck!

 

Even with brake over throttle, it doesn't always work.

 

Well, it works for him, so why don't we let him deal with one thing at a time?

 

For now it does. Mine started out that way too. I'm just trying to offer up my experience. That's all.

 

Just curious on yours; so you have this electrical glitch that is frequently causing the throttle to go wild. You take it out of gear and just watch it banging off the limiter until it quits. Why didn't you just turn off the ignition?

 

Well for one, I'm not going to shut it right down when it's screaming at 5500rpm as it's rather hard on things unless the motor is specifically designed that why which the coyote was not as far as I'm aware. For two at the same time, I was experiencing a no start issue where the truck would randomly crank and crank and fail to start (fuel pump wasn't getting a signal to deliver fuel) and it was -25°C to -35°C at that time and I rather have cab heat if I have to wait for a tow truck. For 3 I'm not going to shut the engine off doing 80 to 100km/h and lose my power steering and brakes.

Not sure if you're trying to be a wise guy or not...

 

Not. Just curious about your unique set of circumstances that could explain why the brake over throttle failed. Being those are two separate systems, it's puzzling that it would fail. Also, I was expecting you to write that you tried shutting down the truck but the key was ineffective.

 

Shutting down the ignition would make braking and steering very difficult.

In situations like this, it's very strenuous. Going to neutral is probably the easiest thing to do.

 

I asked Ford why it failed and they weren't very helpful in providing answers to any of my questions. If that system had a wire running in the steering column it could've been that. They did tell there were a few wires that were cut right through and most of the wires had no insulation for about an inch. Most of the options in the truck worked so I'm not really sure what the wires did that were cut through. I had a lowly xlt that didn't even have the heated mirrors with the signal light in it, so if it was the same harness that was ran for say a lariat, there would be a lot of spare wires. The truck always shut off when I asked it too but I never got the chance to try during those scenarios as I was always moving and it was cold outside. They did replace all the harnesses and the whole steering column.

I never once had a CEL pop up and there were no trouble codes of any kind in the trucks computer.

 

Mine isn’t actually speeding up the rpms are going up and feels like it’s downshifting but it’s staying in the same gear is maybe a better way to describe it, and I have had quite a few electrical issues with the emissions system it got stuck in regin a few times and the dealship said there was a software update that fixed it, now it goes into regin about every 100 miles so I have an appointment to take it back again, I was gunna delete it but Ive been looking at 7.3’s so I don’t want to put any money into it until I decide if I want to keep it or go back to a 7.3