Home » Dodge’s Surprising Claim That The Charger EV Is Supposed To Accelerate On Its Own If The Gas Pedal Fails Might Actually Be Legit

Dodge’s Surprising Claim That The Charger EV Is Supposed To Accelerate On Its Own If The Gas Pedal Fails Might Actually Be Legit

Charger Ev Accel Update Ts2 Copy
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We’ve got to talk about the Dodge Charger Unintended Acceleration story that we and a number of other car publications ran yesterday. Namely, we have to talk about the term “drive-by-brake,” which sounds made up, partly because I cannot find a single reference to this term on the vast internet, and partly because its function sounds truly absurd: It accelerates your car when the “gas” pedal is broken. But is this “drive-by-brake” thing as ridiculous as it sounds? Yes and no.

I’ve been running around trying to talk with safety regulators and accelerator pedal module suppliers to see what the rules are on accelerator pedal failsafes, and I’ll be honest: I haven’t gotten too far. But I have found a NHTSA study and chatted with a number of engineers, many of whom all concluded roughly the same thing: “I get what Dodge is trying to do, and if it’s like a creep mode that’s fine. But it shouldn’t go that fast.”

Vidframe Min Top
Vidframe Min Bottom

That’s where I landed on this whole thing, but let’s step back for a second to recap. Edmunds recently published this article and the below video showing a Charger Daytona EV test car accelerating without any pedal input:

The article describes what happened:

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I was pulling out onto a thoroughfare street from a strip mall parking lot when warning lights appeared on the Charger’s instrument panel for the stability control, frontal collision warning system, regenerative braking and more. There was also a short-lived message — it might have been something about the forward collision warning system — and that the car would be in low power mode. This wasn’t good.

I could tell something was wrong because the car accelerated sluggishly. I got the Charger up to the speed of traffic OK, but then I noticed something was very wrong when I slightly lifted off the accelerator. First, the Charger wasn’t using any regenerative braking to slow itself down like it should. (In an EV, you typically lift off the accelerator and the car decelerates without using the regular friction brakes.) It wasn’t coasting, either. It was, in fact, accelerating.

I watched the speedometer and could tell the Charger was gaining speed at approximately 1 mph per second, even though I did not have a foot on the pedal.

…I had to push on the brake pedal harder than usual to get the car to stop, but fortunately, it did stop. (Presumably, the extra effort was required to counteract the constant acceleration.) As soon as I lifted off the brake pedal, the car started accelerating again. It was a bit like the creeping forward effect you get with a regular car with an automatic transmission, but then it just kept going instead of being limited to a 2-3 mph top speed.

I let the car accelerate by itself as a test. It reached about 45 mph before I had to apply the brakes again for another stop sign. That was enough.

This wasn’t the only complaint of unintended acceleration in a Dodge Charger EV, and that’s damning because there aren’t many Charger EVs on the road. Here’s a complaint on the NHTSA database:

Charger Daytona sudden unintended acceleration NHTSA complaint
Screenshot: NHTSA

And here are a few Dodge Charger Daytona Forum posts, with the latter claiming a 20% pedal input even with the driver’s foot completely off the accelerator:

Charger Ev Accel 8
Screenshot: Daytona Owners
Charger Ev Accel 7x
Screenshot: Daytona Owners

I cannot corroborate all of these claims, and there’s always a potential that the drivers actually had their foot on the “gas” or that something got trapped under the pedal, but the Edmunds video speaks for itself, and then there’s this: Dodge itself admitted that this unintended acceleration was actually intended.

Intended by Stellantis, that is, and in fact branded as “drive-by-brake,” the term that sounds fake and has pretty much no trace on the internet. Here was Dodge’s statement:

In the rare event of an accelerator pedal fault, Stellantis has implemented a ‘drive-by-brake’ safety feature, which allows the driver to control speed through the brake pedal. In this instance, the feature worked as intended, and the driver was able to safely maneuver the vehicle off the road. This feature has been in Stellantis internal combustion engine vehicles for many years and has been carried over to battery electric vehicles.

Many People Are Skeptical

Edmunds’ brief discussion of the above quote was simply “It’s interesting to hear the company describe this acceleration override as a “feature” rather than a bug. Nevertheless, we’ll keep you posted about what happens when the Charger Daytona comes back from the dealer.”

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Our friends at Carscoops car-scooped us with the exact headline we were planning on using —  “Dodge Says Charger Daytona’s Unintended Acceleration Is A Feature Not A Bug” — and that story’s comments definitely include some skeptics; here’s one:

What? “Drive-by brake” sounds like the worst pivot of an automotive excuse I’ve ever seen.

Here’s another:

If your car’s accelerator is malfunctioning, is it really safe to continue driving home? Seems irresponsible to build this “feature” into a car that no one (even auto journalists) knows about.

And here are some skeptics in Thomas’ initial article on this topic here on The Autopian:

Wut. That response seems completely insane, and if it’s really been a “feature” for years in a range of stellantis products I think it needs a lot more coverage.

Here’s another:

Stellantis- “It’s supposed to do that!”

SMH

And another:

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Is that drive-by-brake feature in the user manual? I’ve never heard of such a thing, but I’ve never owned a Dodge. I feel like Edmunds probably reads the manuals for their long-term tests (and if not, shame on them).

What I wonder is, does Dodge really have so many accelerator issues, even in their ICE cars, they were compelled to create this solution? *That* seems a little odd to me…

And another:

‘Working as intended’ isn’t the answer I expected, that’s nuts.

For The Most Part, Folks Get The Concept But Think The Execution/Communication Is Terrible

Most Autopian commenters, though, understand what Stellantis was going for, but think this was poorly executed and that communication with drivers needs to be better. Engineers I spoke with, and I myself, agree.

Given all the screens and how everything is pointlessly now interconnected, it’s annoying that they can’t just pop up a message saying something like “Lost communication with throttle sensor, entering 20% limp home mode” to both make fixing the issue far easier and to calm down the driver as to why the car’s behaving unexpectedly.

Here’s another good one by Keith Tanner acknowledging that he understands the intent:

I was wondering if the 20% throttle signal was an intentional design choice when I read the article before the update. It would allow the vehicle to be moved to safety. This isn’t a terrible failure mode. I agree that maybe the driver should be alerted, it’s not like there’s a lack of screens.

I know that there’s a limp mode in GM PCMs that will allow the engine to idle but ignores pedal input when it thinks something is awry. I’ve triggered it a few times myself when running a rowdier cam that gulps excessive air on shifts, leading to a plausibility error in the MAF that make the car think the throttle was stuck open. I idled to a stop in the Laguna Seca runoff area a few times. I could reset it by power cycling the PCM with my kill switch, which also had the side effect of erasing the codes. The fun part was that the lower air density at my home in Colorado wasn’t enough to trigger it, so the failure only happened at sea level. That made it really fun to try to figure out.

This mode absolutely should be speed limited, as The Mark notes:

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What a very strange failsafe mode. As others have mentioned, it should be speed limited and there should be a message center warning (“Accelerator Error: Vehicle Speed Limited to 15 MPH”) or whatnot. Just enough to get your car safely off the road. I wonder what other OEMs have implemented in the event of this failure, which WILL happen, assuming they all share between a few pedal assembly suppliers.

Superflouis agrees:

If you’re Stellantis, “the feature worked as intended” in response to a video of a car accelerating past 40 mph is a bit odd; add to that the fact that the term “drive-by-brake” is a brand new one not seen in the owner’s manual, and the lack of a clear message on the vehicle’s screen, and I’d argue that Stellantis would have been smart to dive in a bit deeper into what “drive-by-brake” means — in fact, it could have been spun into a positive. But right now,  many think it’s BS — not the fact that a feature exists, but the claim that everything was working “as intended.” It seems hard to believe that a car accelerating itself past 40 without the driver knowing what’s going on is “a feature.”

To be sure, the NHTSA study that Steve helped me dig up seems to imply that this strategy is not entirely unheard of, but again, the bigger issue in my view is the lack of communication with drivers about what is happening, and I think the speed should be limited to maybe a few MPH (it’s hard to believe that 40 MPH is the system working “as intended”). You don’t need to be driving a car on the freeway with no functioning accelerator pedal.

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Also, these new cars shouldn’t have pedal failures in the first place.

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Shooting Brake
Shooting Brake
1 day ago

Fascinating stuff, and brilliant digging to get to the actual facts, thanks for sharing!

Bizness Comma Nunya
Bizness Comma Nunya
1 day ago

Reminds me of the first BYD buses that were sold in the U.S.

They were horrible pieces of shit (they have made huge progress). But one “feature” that they had was if you were in certain situations with your foot on the brake, and in drive, the bus would start going in reverse under its own power. It was due to software/controls issues for the regen.

American Locomotive
American Locomotive
1 day ago

Almost all drive-by-wire cars have this failsafe if a throttle body or accelerator pedal fault is detected. Most drive-by-wire throttle bodies I’ve seen actually default to something like 5-10% opening with no power applied, and the computer actually has to actively drive it closed for idling. The idea is that if the accelerator pedal or throttle body electronics fail, the engine will default to a “high idle”. Just enough to get the car moving and to a safe location. Usually applying the brake pedal will cause the computer to apply a partial fuel cut to the engine (a very low rev-limiter) to bring it down to a rough, but low idle.

It appears in this case there are two issues:
1) The Charger EV pedal (or software) has issues and is defaulting to the “failsafe” way more frequently than a car should

and

2) Chrysler engineers programmed the fail-safe torque value alarmingly high. Seems like an engineer saw “10% Throttle Body Default” for a gas vehicle, neglecting that was for a 165 HP Jeep Renegade and applied the same 10% value to a 670HP EV. It shouldn’t be able to get up to highway speeds in failsafe mode.

Finally, if that much failsafe torque is intentional, then they need to give more information to the driver. i.e. “Accelerator pedal failure, please pull over, 5% acceleration applied – brake firmly”

ADDvanced
ADDvanced
1 day ago

Yup. Communication is key. Making the car movable to get out of dangerous situations makes 100% sense, but they did not communicate any of this to the driver.

Beached Wail
Beached Wail
1 day ago

This is a well-known feature of many Stellantis vehicles: “Drive by ‘break'”

RidesBicyclesButLovesCars
RidesBicyclesButLovesCars
1 day ago

I would believe Stellantis if any application of the brake disengaged the acceleration. Since an owner reported that it took more brake application to stop the vehicle, I am calling out their BS.

Long ago, manufacturers started programming their cars to reduce the engine power output if the brake and accelerator were both depressed. See the Toyota Star Safety System, SST.

James Mason
James Mason
1 day ago

No longer need put a brick on the gas pedal before jumping out…

Tbird
Tbird
1 day ago
Reply to  James Mason

Just tinker with the ilde screws…

TDI_FTW
TDI_FTW
1 day ago

I wonder what their top speed in this mode would be, can someone take it out onto the highway and see how fast they’ll go? (or, fine, you can be safe and use a dyno).

I can see it now:
Cop: do you know why I pulled you over?
Person: I swear officer, I was doing the speed limit until my car decided it needed to go faster! It’s not my fault.

The Clutch Rider
The Clutch Rider
1 day ago

why there are so many “gas” pedal failures in these cars? I don’t think i have heard of one in the last 25 years or so that they have been pretty common?

sentinelTk
sentinelTk
1 day ago

Dodge just trying to one up the Cybertruck…..

Hartley
Hartley
1 day ago

I’ve had the precursor condition for drive-by-brake happen twice now, I just happened to be parked and starting the car at the time, not driving.

I didn’t try to take it out of Park to see what happens, but I’m going to if/when the car goes into limp mode again.

Also, it’s such a shame Dodge has screwed up basically everything possible about the new Charger, because I think it really does have so much potential.

Also also, yay I get mentioned in an article!

Dennis Birtcher
Dennis Birtcher
1 day ago
Reply to  Hartley

As someone else who said “it’s probably in the manual” yesterday:

  1. Good on you for actually checking
  2. Terrible on Dodge for not mentioning it
Hartley
Hartley
1 day ago

I probably did the same thing David did: a CTRL+F on the PDF version for every mention of “accel” and “brake,” as well as reading the “warning lights” (which David posted most of) and “in case of emergency” sections.

The NSX Was Only in Development for 4 Years
The NSX Was Only in Development for 4 Years
1 day ago

Only a matter of time now before Dodge tweets out, in edgy marketing-speak, that slowing down is woke and this is just the car’s way of helping you be a man. JD Vance will retweet this with the cry laughing emoji and will do a photo-op with whoever’s in Charge of Dodge now. During this photo-op he will, at some point, slam his dick in the car door and will disappear from public for approximately 10 days, but no media outlet will ever speak of it again.

Last edited 1 day ago by The NSX Was Only in Development for 4 Years
Hartley
Hartley
1 day ago

I mean, they went to the trouble of sending out a software update to change the nomenclature of the menu function to turn the electronic vroom vroom noises on and off to try to sound more badass.

At purchase: EV Sound On/Off

After a late April/early May update: Stealth Mode On/Off

So yeah, it’s entirely possible they would do something like this.

NewBalanceExtraWide
NewBalanceExtraWide
1 day ago

Car door is a weird substitute for a couch, but hey, weird is the brand, so why not?

Crank Shaft
Crank Shaft
1 day ago

It shouldn’t be happening in the first place. I firmly believe these are software coding errors, and not mechanical ones. I consider that essentially unforgivable. Not because coding complicated systems isn’t one of the hardest things in the universe to do perfectly, but because the accelerator is a primary system and as such, should have been well sorted before being released. It’s not like it’s a new feature in vehicles either. Electronic gas pedals have existed for decades now. This is basic modern car stuff, not something new. What is new is their code for this vehicle and it’s clearly not ready.

I like UConnect BTW, so it’s not like they can’t produce viable code. Let’s blame Carlos for this one.

Phuzz
Phuzz
1 day ago
Reply to  Crank Shaft

They definitely seem to be failing more often than they should. The only other possible physical causes I could think off it if there’s a problem with the wiring harness in the Charger, eg it’s slightly too short, or it’s not properly shielded in a particular spot and too easily rubs on something. I’d be very surprised if the pedal units themselves aren’t common across other vehicles.
But yeah, software would be my first guess.

Takuro Spirit
Takuro Spirit
1 day ago

It is a feature in the gas cars. The electronic throttle went out in my beater 200, and instead of being stuck at idle, it had a HIGH idle that allowed me to still drive it, mostly by shifting the 6AT manually to get up to roadway speeds.

Abdominal Snoman
Abdominal Snoman
1 day ago
Reply to  Takuro Spirit

When this happens does touching the brake barely get the car to return to idle levels of power or if you’re trying to maintain say 25MPH are you constantly dragging the brakes?

If it’s the former I am a big fan of this system IF THEY CLEARLY STATED THE ISSUE to the driver! I’ve had a throttle cable break on me while driving on the highway in my first car, a throttle cable get stuck at full throttle in a track car (turns out tire dust + having the throttle cable right next to the breather makes a nice paste after several years) but was able just hit the kill switch and get towed back to the paddock, and most scarily of all in a Chevy 3500 express while towing as I crest a hill. My only recourse then was to turn off the vehicle which locks the steering momentarily until the engine dies, then turn it back on and try to slow the van + 9K Lb of trailer down without power brakes while going downhill. Fortunately the trailer brakes were just redone a few months earlier. Compared to old cable throttle methods of failure this system is much safer and better in my opinion both from a standstill and at highway speeds.

The problem in my opinion is that as cars have gotten much smarter about the status of each component and are able to provide a wealth of useful diagnostic data they’ve only gotten dumber and more hostile in their communication. For example the old way of doing power windows is power goes to the main switch panel + multiple slave switches, activates a relay perhaps, and then sends power to the motor, which then moves the window up and down a mechanical track known to break fairly often. The new way is to have 4 separate switches tied to a central controller and 4 separate window motors which also are positionally aware. In the old car you’d have to start probing wires at many locations and mechanically test several components. A new car has the ability to tell you it lost communication with which specific switch, which motor it lost communication on, or which window has a blockage preventing it from moving to pinpoint exactly the part that needs to be investigated and replaced while the other 3 keep working. Instead, it may decide to disable all your windows, your sunroof, your power locks, and heated seats because “fault mode” and only display a message to “see your service center”, where only they can look up the codes because they’re not using standard OBDII diagnostic codes for things that aren’t required.

The Mark
The Mark
1 day ago

I hate the thought of advocating for MORE regulation, but it sounds like there needs to be a rule on this. The failsafe should be consistent regardless of OEM, including whatever gets displayed on the message center.

The Mark
The Mark
1 day ago
Reply to  David Tracy

Lawyers have to approve the messages and this one might be too wordy but yes, that should be the idea. The driver must be informed what’s happening!

sentinelTk
sentinelTk
1 day ago
Reply to  David Tracy

Yeah, but what if I prefer going to a non-dealer affiliated shop? Or fix it myself? Take that, David! Right to repair!!!

Black Peter
Black Peter
1 day ago
Reply to  David Tracy

This is literally he least they could do. I mean my coolant reservoir was 1/8″ low one day and the car literally yelled at me and demanded I TURN OFF ENGINE NOW”..
However, she is German and can be a bit, shall we say, overbearing in nature.

World24
World24
1 day ago

It just sounds like the reverse of OPD, tbh.

Sid Bridge
Sid Bridge
1 day ago

Dear Owner,

We are aware that your Ford Pinto recently explosively removed the contents of its fuel tank. This is actually a safety feature intended to clear space behind the vehicle in the event of a rear-end collision. Enclosed is a new set of “I love my Ford” floor mats, our gift to you for being a loyal Ford customer.

Sid Bridge
Sid Bridge
1 day ago
Reply to  David Tracy

You have no idea how close I came to buying one before I got the Suby. Saw a wagon that really piqued my interest. I would rock a Pinto. And yeah, I’m very aware that darn near every car before the 70’s had a fuel filler neck in the same spot as the Pinto (including my Olds). It’s sad that my joke is on slightly less sensitive than Ford’s actual response.

But still, I have a big soft spot for little cars that have big car architecture. Mini versions of the front engine/rear drive setup deserve love. Gimme a Pinto, a Chevette, a 70’s Celica…

Justin Thiel
Justin Thiel
1 day ago

My 1985 Delta 88 would also do about 45 mph with no pedal input.. just put it in drive and it kind of just.. went.

John Beef
John Beef
1 day ago
Reply to  Justin Thiel

My sister’s ’84 Tercel would do the same

JDE
JDE
1 day ago
Reply to  Justin Thiel

I was going to say, this was kind of a thing back in the carburetor days as things gummed up and or started to wear out. turning down the idle was all you could often do until the root cause was found.

Dennis Birtcher
Dennis Birtcher
1 day ago
Reply to  Justin Thiel

My ’72 Delta 88 does that too. In my case, that’s big block torque, a tall axle ratio, and high idle being enough being enough for the transmission to hit third.

Drew
Drew
1 day ago

EV fans love to say that one pedal driving is great, but Dodge decides to make that pedal the brake and it’s suddenly not okay?

Dan1101
Dan1101
1 day ago

>So are there any other secret drive modes that Stellantis uses, say, if the steering fails you can control the steering rack with the window switches? Or if the parking brake fails, the power seat buttons can be used instead?

That’s silly, the volume knob should control the throttle and the tuning knob the steering. Only way to drive.

Dan1101
Dan1101
1 day ago
Reply to  David Tracy

As a computer programmer, all the computer stuff in cars fascinates me, frustrates me, and the likelihood of bugs scares me.

If nothing else I wish the vehicle would communicate what it knows and what it’s doing with the driver more. I know manufacturers don’t want to confuse/scare drivers but for one thing simply displaying the trouble code and description on the giant-ass touch screen instead of just turning on a Check Engine light sure would be nice.

Kleinlowe
Kleinlowe
1 day ago
Reply to  Dan1101

When Tesla first started building cars around giant touchscreens, I had lovely dreams of my car being able to not just show an error code, but pull up an interactive service manual, show me where the problems are, what diagnostic and repair procedures are advised, then offer me links to either buy replacement parts or contact my preferred service center.

We have failed as a society.

Phuzz
Phuzz
1 day ago
Reply to  Kleinlowe

From what I’ve heard, Tesla’s public service manuals are actually pretty good, and I presume you could load it on the touchscreen. They are missing a trick not making it interactive though, there’s no reason why it couldn’t at least automatically take you to the page in the service manual dealing with whatever problem code(s) your car is throwing.

AssMatt
AssMatt
1 day ago
Reply to  Dan1101

I just want to cover up the smell, not go faster!

Who Knows
Who Knows
1 day ago
Reply to  Dan1101

That would certainly make sense, but I thought those no longer existed in modern cars? Maybe Dodge will put them back in for backup controls?

Hartley
Hartley
1 day ago
Reply to  Who Knows

The new Charger has a plethora of several actual dials and buttons! No tuning knob, though, just volume.

The Stig's Misanthropic Cousin
The Stig's Misanthropic Cousin
1 day ago

This is making me think of Boeing’s MCAS debacle a few years ago. Like MCAS, drive-by-brake is a cromulent solution to a very specific problem. Also like MCAS, Dodge erred by not including a description of this important “feature” in any manual. How hard would it have been to add one line describing drive-by-brake in the owner’s manual? Not everyone will read the manual, but enough will that this feature wouldn’t be a complete surprise. Dodge is lucky no one was injured or killed as a result of this feature. I’m surprised companies can’t learn from the mistakes of others.

I also concur with everyone who says this feature should be limited to slow/parking lot speeds. Allowing the car to accelerate to 45+ mph is a bizarre decision. At this point I’m very skeptical of any Dodge product. If this is what happens when the car is working as designed (aside from the pedal failure), what happens when something goes wrong???

The Bishop's Brother
The Bishop's Brother
1 day ago

Literally the first thing that came to mind…

TDI_FTW
TDI_FTW
1 day ago

You weren’t already skeptical of a Stellantis product?

Username Loading....
Username Loading....
1 day ago

NHTSA: Stellantis it looks like you have a number of unintended acceleration complaints.

Stellantis: Oh. Um. No, the acceleration is intended, just not by the person driving the car.

NHTSA: Oh ok, carry on then.

Jack Beckman
Jack Beckman
1 day ago

It insane to think that this would be OK with anyone. And it’s scary to find out it’s supposedly in ICE vehicles too. Having a vehicle do the unexpected is exactly why people fear self-driving cars. So it’s even crazier that in a car I supposedly control it can just take off on its own. Anything over a couple of miles an hour it nuts.

Last edited 1 day ago by Jack Beckman
Username Loading....
Username Loading....
1 day ago

Absolutely no way a car should intentionally accelerate itself beyond parking lot speeds. Especially since it doesn’t seem to give the driver any indication of what the feature is or how it works. Additionally these Chargers seem to be having lost of issues with loss of comms to the accel pedal maybe they should fix that as well.

10001010
10001010
1 day ago

I guess you can’t stop a Charger

JCat
JCat
1 day ago
Reply to  10001010

Time to dodge the charging vehicle

Mr E
Mr E
1 day ago
Reply to  JCat

Lest you ram it into a hedge. Or a wall. Or traffic.

Urban Runabout
Urban Runabout
1 day ago

Oh – this is worse than the Audi thing – which wasn’t really a thing.
This is full-on gaslighting.

Mr E
Mr E
1 day ago
Reply to  Urban Runabout

My parents owned an oil change business when I was a kid. An Audi 5000…um…Audi Fivethousanded itself off the front of the lift, hanging precariously. My parents had to pay for the repairs. Shortly thereafter, Audi announced the recall, but it was too late for my folks to recoup those funds.

But back to the Dodge…at this point, I don’t need any more reasons not to buy one.

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