Issues with '14 2LT - Page 3 - Chevy Impala Forums
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post #31 of (permalink) Old 03-30-2014
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The dealership stating that the iPod is causing all of the problems with the radio is just silly and a completely uneducated excuse. If you can't use an iPod with a 2014 Chevy Impala, then they need to redesign the "infotainment system" in this vehicle!

Regarding the brakes not working, I'm wondering if the issue was really that the accelerator was "stuck" - since the gas pedals in newer cars are all electronic, it could be that there was some sort of electrical issue with the gas pedal and it just took much longer for the car to stop because it was actually accelerating at the same time.

Regardless, the dealerships responses are unacceptable. They should at least be driving the car around here and there during the day to see if they can duplicate these concerns. Simply saying that they are unable to duplicate repeated issues that the owner has experienced is unacceptable. All that they've have done is read the computer. It's like some technicians these days don't even know how to troubleshoot cars anymore - they rely on the computer to tell them everything - if the computer says it's fine then it must be fine! Ridiculous.

I'm all for technology, but not EVERYTHING on a car should be electronic! Just too much that can go wrong...

EDIT: do some new cars now have electronic braking systems as well (like drive-by-wire, but for brakes)? Or are all brake systems still mechanical in nature?
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post #32 of (permalink) Old 03-30-2014
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Regarding the brakes not working, I'm wondering if the issue was really that the accelerator was "stuck" - since the gas pedals in newer cars are all electronic, it could be that there was some sort of electrical issue with the gas pedal and it just took much longer for the car to stop because it was actually accelerating at the same time.
There is a lot of logic programmed for the drive by wire throttle systems., if there is any conflict, it is not supposed to work. This was a big topic with the Toyota unintended acceleration debacle. Nobody was ably to ever get a vehicle to accelerate unintentionally (from an electrical stand point) without bypassing many fail safes. This does not apply to the carpet causing the throttle to get stuck. But the systems are designed that if the throttle is engaged and the brakes are being applied at the same time that the brakes get priority (accelerator stops or is deactivated). They call this a Brake Override System. I think it is mandatory on drive by wire throttle systems.

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do some new cars now have electronic braking systems as well (like drive-by-wire, but for brakes)? Or are all brake systems still mechanical in nature?
As for electric or drive by wire brakes, the manufacturers have been playing with it. From what I have read, only Mercedes and Toyota have used this on any vehicles, not sure if there are any production versions. Electric brakes are even trickier to design from a safety and fail safe operation stand point.

The Chevrolet Volt and probably the Cadillac ELR and some other electric vehicles use Regenerative braking in which mechanical power of braking is converted back to electric power to help with electrical consumption. The Volt/ELR also have a odd set up in which when the brake pedal is pushed, it uses the large electric motor to slow the vehicle down to a certain point and then the Hydraulic brakes take over. There were a lot of complaints at first because it had a different feel to it as it was transitioning from electric to Hydraulic braking.

Most vehicles still use traditional Hydraulic brakes with either 4 wheel disc or front disc/rear drum brakes.

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All that they've have done is read the computer. It's like some technicians these days don't even know how to troubleshoot cars anymore - they rely on the computer to tell them everything - if the computer says it's fine then it must be fine! Ridiculous.
I most certainly agree !!
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post #33 of (permalink) Old 03-30-2014
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@OP - when you said your brakes didn't work, did the car eventually just come to rolling stop naturally or did the brakes help slow it down, just not nearly fast enough? Just trying to understand the exact situation a little better.

I do understand that they build "Failsafes" into the electronic drive-by-wire systems, but it sure sound like *something* failed in the OPs case - the way he describes it, the car kept accelerating even though he had his brakes applied at full pressure. At this point, I can't tell if the brakes were working, but the accelerator was working harder or if the brakes just didn't work at all. Since he mentioned that the transmission seemed to stay in gear, I'm guessing that the car was still accelerating even though he had the brakes fully applied. The only thing that I can think of that would cause that situation is some kind of stuck accelerator... That would make more sense than the brakes just not working at all.

Either way, VERY scary! I sure hope the OP gets to the bottom of it somehow....
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post #34 of (permalink) Old 03-30-2014
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@OP - when you said your brakes didn't work, did the car eventually just come to rolling stop naturally or did the brakes help slow it down, just not nearly fast enough? Just trying to understand the exact situation a little better.
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^^this...brakes actually engaged about 500 yards on the wrong side of the stop sign. I'm incredibly lucky I was going to not coming from work. Heavy traffic in the afternoon would have certainly changed the outcome of running the stop sign
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post #36 of (permalink) Old 03-31-2014
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This sounds a lot like the problems that Toyota has had with uncontrollable acceleration. Being able to stop your car safely is one of the most basic functions that a car should be able to do reliably. Too much electronics in a vehicle allows too many things that can go wrong. I will never buy another GM car again. Their quality is going down the crapper. It seems like all their cars are being recalled.

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This sounds a lot like the problems that Toyota has had with uncontrollable acceleration. Being able to stop your car safely is one of the most basic functions that a car should be able to do reliably. Too much electronics in a vehicle allows too many things that can go wrong. I will never buy another GM car again. Their quality is going down the crapper. It seems like all their cars are being recalled.
Yes it does sound like the Toyota issue. The problem is that the Toyota issue was never proven. The only way it was re-created was to intentionally disable numerous fail safes in the computer. This would just not happen in the real world. Even NASA could not re-create or find an issue with it. GM, Ford, Chrysler and most others all use a similar system for the electronic throttle.

As for the Recalls, GM is just getting a lot of extra exposure. I am sure if you went on a hunt, you would find many hidden issues at Ford, Chrysler and others, It's not just a GM Culture issue, it is a Industry issue. Don't get me wrong, GM has some work and house cleaning to do, but it is getting blown out of proportion.

People seem to have quickly forgotten the Ford/Firestone Tire Issue which killed over 200 people over the years. Ford did a pretty good job of throwing Firestone under the bus, but Ford was just as responsible, they knew the issues, they lowered the tire pressure rating on the vehicle to get it to pass testing, despite the fact that Firestone told them that the tire was not designed for that air pressure.
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post #38 of (permalink) Old 03-31-2014
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Flashback - when I drove a 14 Impala LT for a few weeks this summer - on one occasion when I went to hit the brake, it felt like the gas was still pressed and the car did not slow at all. Guess what? The gas was still pressed. My foot somehow was pressing both pedals at the same time. My foot must not have been angled enough and I did not move it far enough to the left to clear the gas pedal. I am only a size 11, so it was not the size of my feet. I also had this happen once in my friend's 2010 SHO. No explanation for it as in my 39 years of driving, these two incidents are the only ones I recall like this. Bad design? Fluke? Getting older and clumsy? Just a thought for the OP. If you are a young guy - ignore option 3.

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post #39 of (permalink) Old 04-02-2014
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Flashback - when I drove a 14 Impala LT for a few weeks this summer - on one occasion when I went to hit the brake, it felt like the gas was still pressed and the car did not slow at all. Guess what? The gas was still pressed. My foot somehow was pressing both pedals at the same time. My foot must not have been angled enough and I did not move it far enough to the left to clear the gas pedal. I am only a size 11, so it was not the size of my feet. I also had this happen once in my friend's 2010 SHO. No explanation for it as in my 39 years of driving, these two incidents are the only ones I recall like this. Bad design? Fluke? Getting older and clumsy? Just a thought for the OP. If you are a young guy - ignore option 3.
relatively young at 41, also wear a size 11
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post #41 of (permalink) Old 04-02-2014
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Maybe a change in the pedal design is needed?

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