Car moves without tapping accelerator - no idle

[Kangio]

I usually drive with 1-pedal mode. Today my car decided to do one of its random resets of all of my settings, which turned off 1-pedal mode. When I started the car and shifted to reverse, the car automatically moved. I had to step on the brakes or else it will continue to travel at about 2 mph.

Same issue when put into drive.

If I turn on “Brake assist”, it will hold the car stopped when I let up on the brake in Drive mode. However, this doesn’t work in reverse (car moves immediately when put in reverse unless stepping on brake). BTW, this is on flat rode (I am not rolling down a hill).

Is this normal? Seems VERY dangerous to have the car not “idle” in D or R! Fortunately I prefer 1-pedal mode but worried if it randomly resets again and I don’t notice right away.

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[Kamuelaflyer]

Our Ford F-150 Raptor starts moving the moment you release the parking brake and put it in reverse. The only time it’ll stop is if you use the brake or back into an immovable object. My Toyota Tacoma does the same thing too.

So I’m not really sure what the complaint is.

 

[Kangio]

Well, I guess my experience (thanks for 4 adult kids) with Suburbans, Minis, Audis, Toyotas, VW, Subarus, and Acura cars is an anomaly. They have all remained pretty stationary when idling unless on a hill. I think its the speed it wants to immediately travel that seems so off and jarring. But thanks anyway for the helpful reply

 

[DevSecOps]

So I’m not really sure what the complaint is.

I think the issue is mostly that bake assist isn't activating in reverse. Honestly, I would expect it to if I had it enabled. Also EV's don't always roll like ICE vehicles do at idle because the "motor" isn't running at idle like a gas powered engine.

However, without 1-Pedal on it could roll as the car is basically in "N". Brake assist only applies AFTER the brakes are applied at a stop as you noticed. I have disabled brake assist so I'm not sure if it works in reverse. But there's an indicator on the dash when brake assist is activated. If it's not there in reverse then I guess it was designed to be that way or some computer programmer forgot ?‍ .

 

[SnBGC]

I usually drive with 1-pedal mode. Today my car decided to do one of its random resets of all of my settings, which turned off 1-pedal mode. When I started the car and shifted to reverse, the car automatically moved. I had to step on the brakes or else it will continue to travel at about 2 mph.

Same issue when put into drive.

If I turn on “Brake assist”, it will hold the car stopped when I let up on the brake in Drive mode. However, this doesn’t work in reverse (car moves immediately when put in reverse unless stepping on brake). BTW, this is on flat rode (I am not rolling down a hill).

Is this normal? Seems VERY dangerous to have the car not “idle” in D or R! Fortunately I prefer 1-pedal mode but worried if it randomly resets again and I don’t notice right away.

Very normal. Every vehicle not equipped with "Auto hold" (or have it disabled) is expected to move under power when in gear and the brake is released. Exceptions are EVs with 1PD and manual transition vehicles when the clutch is depressed.

Edit. You can enable auto hold and not be surprised when your settings reset away from 1PD in the future. That might work.

 

[Mach-Lee]

Well, I guess my experience (thanks for 4 adult kids) with Suburbans, Minis, Audis, Toyotas, VW, Subarus, and Acura cars is an anomaly. They have all remained pretty stationary when idling unless on a hill. I think its the speed it wants to immediately travel that seems so off and jarring. But thanks anyway for the helpful reply

Are they all luxury models with auto hold? Creeping in gear has been the norm with automatic transmissions for decades, I'm not sure why you think this is unusual behavior?

 

[generaltso]

Well, I guess my experience (thanks for 4 adult kids) with Suburbans, Minis, Audis, Toyotas, VW, Subarus, and Acura cars is an anomaly. They have all remained pretty stationary when idling unless on a hill.

Is it possible you’re misremembering? I’ve owned several of those brands, and they all creep when in gear. As has every automatic transmission ICE vehicle I‘ve ever driven. Pretty sure this has been normal operation for decades.

 

[Motomax]

Well, I guess my experience (thanks for 4 adult kids) with Suburbans, Minis, Audis, Toyotas, VW, Subarus, and Acura cars is an anomaly. They have all remained pretty stationary when idling unless on a hill. I think its the speed it wants to immediately travel that seems so off and jarring. But thanks anyway for the helpful reply

Well automatic ice cars all creep because the torque converter can’t “disconnect” completely. So all those cars should have behaved the same way (except for dual clutches and hill hold). In fact, when an EV creeps it’s because it’s intentionally mimicking the behavior of traditional automatic ice cars.

That said, 1PD should disable the creeping-although, enabling the creep in reverse would be a welcome feature. 1PD in reverse is kind of ridiculous.

The software shouldn’t reset it self BUT if you just apply the brakes when changing gears (just like you would in an ice car) you’ll never be caught off guard if it does happen again.

 

[Crilly]

If you are the only one driving, set all three settings on the door to you.

 

[Kangio]

i appreciate all the responses. At the end of the day, perhaps 1-pedal driving has retrained me To forget about the brake?. I have engaged the brake assist setting, but also switch back to one pedal driving.

 

[ShadowCVL]

This thread cracked me up. Any automatic transmission that uses a torque convertor will "creep". the MME does this to mimmic ICE, turning on auto-hold turns off the creep.

This does not apply to double clutch transmissions, but these days those are usually much more expensive than the MME.

 

[macchiaz-o]

This thread cracked me up. Any automatic transmission that uses a torque convertor will "creep". the MME does this to mimmic ICE, turning on auto-hold turns off the creep.

This does not apply to double clutch transmissions, but these days those are usually much more expensive than the MME.

My Fiesta had a dual clutch transmission and crept. Its MSRP was below $20k. Just like any car with drive by wire, creep can be simulated.

 

[ChuckA]

I usually drive with 1-pedal mode. Today my car decided to do one of its random resets of all of my settings, which turned off 1-pedal mode. When I started the car and shifted to reverse, the car automatically moved. I had to step on the brakes or else it will continue to travel at about 2 mph.

Same issue when put into drive.

If I turn on “Brake assist”, it will hold the car stopped when I let up on the brake in Drive mode. However, this doesn’t work in reverse (car moves immediately when put in reverse unless stepping on brake). BTW, this is on flat rode (I am not rolling down a hill).

Is this normal? Seems VERY dangerous to have the car not “idle” in D or R! Fortunately I prefer 1-pedal mode but worried if it randomly resets again and I don’t notice right away.

Only ICE vehicles idle. Idle describes engine speed required to avoid a stall at low engine rpm.

With 1-pedal and Brake Assist off Hold, the car will roll. Most people naturally have their foot on the brake when changing from Park to R or D..

 

[macchiaz-o]

Most people naturally have their foot on the brake when changing from Park to R or D..

All people do this, I hope.

There is an interlock to prevent spinning the gear selector out of Park, requiring vehicle on, ready, and foot on brake.

 

[Motomax]

My Fiesta had a dual clutch transmission and crept. Its MSRP was below $20k. Just like any car with drive by wire, creep can be simulated.

My 06VW slips the clutch as soon as you reduce brake pressure as well. Most newer dual clutch have brake/hill hold now, I wasn’t a fan when I drove one.

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