Shake or Vibration Issues

[keakar]

 

Yeah, I may have been rude but just to make a point to this guy... Listen, I just traded a 2012 Dodge RAM Hemi Bighorn for my 2014 Silverado. I had a lot of issues with the Ram and even went through the Lemon Law process with it. I am real happy with the Chevy but you don't see me posting on the Dodge RAM Gen 4 site and telling everyone how great Chevy is and how I made the best decision getting rid of the truck when everyone on that site is driving a RAM. I just call it as I see it and you guys are the trolls here ...

don't get your panties in a bunch, you were wrong to be rude and you admitted it, everyone has a bad day and I guess he just hit a nerve that set you off.

 

then you follow up your admission with a shot at those who pointed out you were being unreasonably rude, grow up please.

 

people should not be posting to pimp ford or dodge or anything else here, it should just be about the issues we have with our GM trucks

Edited January 12, 2015 by keakar

[MudMutt]

don't get your panties in a bunch, you were wrong to be rude and you admitted it, everyone has a bad day and I guess he just hit a nerve that set you off.

 

then you follow up your admission with a shot at those who pointed out you were being unreasonably rude, grow up please.

 

people should not be posting to pimp ford or dodge or anything else here, it should just be about the issues we have with our GM trucks

I have a few post on this thread that are totally legit and only reference the issues ... That's why I went off when people come on here and say how much they love Ford. That's just a kick in the gut ... People need to grow some balls and address it when it happens ... He is not the first person to get burnt with a lemon, it happens every day cuz.

[RyanbabZ71]

Ok enough stop calling people out which makes the topic spiral out of control and don't reply to nonsense replies. Keep it up and vacations will be handed out. Last warning

 

 

Ryan

[bogeypro]

Anybody had any success with getting it resolved? Haven't read any success stories lately....

 

 

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[albe1234]

Anybody had any success with getting it resolved? Haven't read any success stories lately....

 

 

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After many tire replacements, road-force balancing, new front shocks. new rear end assembly, 18 inch tires in place of OE 20 inch, truck still has vibration but GM engineer says all is with-in limits. Dealer still has truck. I'm supposed to pick up today. I plan to have them put original 20 inch wheels/tires back on. Undecided on next step. Any good advice?

Al

[pm26]

Suggest you get a 2014 GM vehicle specification book. This should list all permissible tolerances on various parts and assemblies. Then you will have something official to compare the measured values against and not rely on some questionable claims. I assume that GM has such a book. I have a copy of 1985 Ford vehicle specifications and it is quite detailed.

 

As for vibration readings, I would ask for an official letter from GM which specifies what maximum permissible vibration values are, and then compare those to the actual reading taken on your truck. Without documentation, they can tell the customer anything they want. If they are unwilling to give you this, then I would assume they are not being truthful.

Edited January 13, 2015 by pm26

[14silverado4.3]

Smooth Road Shake - Electronic Power Steering: Anybody pursue this yet? Apparently GM has some software that will compensate for smooth road shake, possibly slight out of balance on the front tires.

 

I still get slight vibration from the steering wheel, mostly all highway driving for me.

 

It is a slight annoyance and seems to come and go.

From GM techlink

 

Electric Power Steering System

 

The belt-driven electric power steering system features an integrated electromechanical power steering unit, containing the power steering control module, its sensors, the power steering motor, a belt drive and a ball nut mechanism.

 

The power steering control module is part of the power steering assist motor assembly and is replaceable as a complete unit independent of the steering gear assembly. The torque sensor is integrated with the steering gear pinion and is serviced as part of the steering gear.

 

The power steering control module has a software feature referred to as Smooth Road Shake Compensation that reduces steering wheel vibration caused by an imbalance from the front tire/wheel assemblies. The vibration transmitted to the steering wheel is referred to as Smooth Road Shake and is a phenomenon that occurs only at highway speeds and on smooth roads. The power steering control module employs active controls to sense and reduce the periodic torque component applied to the steering wheel caused by the wheel imbalance force. This software feature will compensate for a specific range of imbalance.

 

In addition to smooth road shake, road crown is compensated for by the steering wheel angle sensor signal, which calculates the intended driving direction. The Electronic Brake Control Module (EBCM) receives serial data message inputs from the steering wheel angle sensor.

 

The steering wheel angle sensor does not require centering often. However, if the steering wheel angle sensor is not correctly centered it may create a lead/pull condition. If this condition is encountered, always perform the Steering Angle Sensor Centering procedure in SI before performing a wheel alignment.

[pm26]

 

 

The power steering control module has a software feature referred to as Smooth Road Shake Compensation that reduces steering wheel vibration caused by an imbalance from the front tire/wheel assemblies.

 

While I would like to believe this claim, in reality it seems that the assembly does just the opposite: The power steering control module has a software feature referred to as Smooth Road Shake Amplifier that amplifies wheel vibration caused by an imbalance from the front wheel tire/wheel assemblies.

 

Could a simple software update fix this condition?

Edited January 14, 2015 by pm26

[14silverado4.3]

PM26, I bring that up here so we can this out in the open for all to see.

 

If the software can reduce "felt" steering wheel vibration, what is the max imbalance before it can be felt?

 

I would venture to guess that most service managers have no clue this exists, balance the tires away and still have the smooth road shake because this:

from the excerpt please re- read this line again:

 

"The vibration transmitted to the steering wheel is referred to as Smooth Road Shake and is a phenomenon that occurs only at highway speeds and on smooth roads".

 

If the system fails, how would you tell without testing it...

 

I have never seen any service writeups yet that state "checked software for smooth road shake compensation unit".

 

All I seem to see here is replace wheels, tires, driveshaft, balance road force, ring and pinion gears.

 

I would think someone who is here and deep with the service should check to see if the software test was performed as part of GM diagnostics.

 

I wonder if the GM diagnostics even know it is part of the vehicle platform, only there due to the electronic steering available on the Silverado - I do not believe that electronic power steering was ever on another prior year Silverado.

 

For all we know, the assembly plants may not even know the software needs installed.

[pm26]

Yes, the electric steering is brand new for the 2014 model year Silverado and GMC Sierra and as such it must be looked at when trying to analyze these annoying vibration problems.

[pm26]

Today I talked to a tech at the local Chevy dealership and he told me that about 10% of the 2014 trucks sold there are coming back for service for vibration issue. The major cause are bad tires, but also bad drive shafts and rear ends. 1 out of 10 trucks is not a comforting number.

[Mutau95]

I posted in this thread last summer about vibrations felt in my 2014 CC SB LTZ 4x4 with 3:08 rear. At the time I realized what was going on with my truck it had around 14k-15k miles. My truck is running the stock SEY 22's with the factory Bridgestone tires. I went through Road Force Balancing and all and didn't really feel a difference. With work and all I didn't have time to keep running back and forth to the dealer or look into lemon law proceedings. To make a long story short i have had my truck exactly one year and have 28k miles on it and those same vibrations that were present at 70mph and greater have all but disappeared. I have only rotated my tires at each oil change and the problem has resolved itself. I think the tires were partially to blame as they now have roughly 60% life remaining. It could also be that parts are more broken in and those tolerance flaws have evened out. My truck rides 100% better and I hope its last me for years to come or until the next recall.

[mikeinmobileal]

After many tire replacements, road-force balancing, new front shocks. new rear end assembly, 18 inch tires in place of OE 20 inch, truck still has vibration but GM engineer says all is with-in limits. Dealer still has truck. I'm supposed to pick up today. I plan to have them put original 20 inch wheels/tires back on. Undecided on next step. Any good advice?

Al

Advice? Yes. Keep at it if you arent satisfied. Dont let them buffalo you. File a complaint with BBB Autoline and follow through. Send GM a certified letter ASAP and offer a Final Repair Attempt. Templates are available online for what info that letter needs to include. Contact a Lemon Law attorney and get some free advice. My Lemon Law attorney is Alex Simanovsky and he does great work.

 

Anybody had any success with getting it resolved? Haven't read any success stories lately....

 

 

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Yes. The buyback offer letter from GM arrived today.

[BluByU14]

I posted in this thread last summer about vibrations felt in my 2014 CC SB LTZ 4x4 with 3:08 rear. At the time I realized what was going on with my truck it had around 14k-15k miles. My truck is running the stock SEY 22's with the factory Bridgestone tires. I went through Road Force Balancing and all and didn't really feel a difference. With work and all I didn't have time to keep running back and forth to the dealer or look into lemon law proceedings. To make a long story short i have had my truck exactly one year and have 28k miles on it and those same vibrations that were present at 70mph and greater have all but disappeared. I have only rotated my tires at each oil change and the problem has resolved itself. I think the tires were partially to blame as they now have roughly 60% life remaining. It could also be that parts are more broken in and those tolerance flaws have evened out. My truck rides 100% better and I hope its last me for years to come or until the next recall.

 

That is interesting to hear. I believe you are the second or third person to have posted in the last week or two that their vibration/shake issue has "disappeared" simply by continuing to drive it. While those who continue to have the issues, that is may not be the greatest of news, but is semi-promising in some regard.

[20L8TSierra24]

My Chevy dealer has had a red dbl cab on their lift with the rear end tore out of it for almost 2 weeks now... Poor guy