Going in for Frame Rust TSB (free undercoating?)

blacksvt · August 6, 2014

Picked up the truck from dealer today. I'm very impressed with the job they did on the frame. It appears that the entire frame was done, not just the bad spots. They also coated the rear axle, and the truck been detailed when I picked it up.

blacksvt · August 6, 2014

pictures

Sluggo · August 9, 2014

Looks like they did a pretty nice job.

Clocked92 · August 6, 2015

pictures

That looks really good! I'm phoning tomorrow about the same issue on my truck. Do you have a copy of the service report saying what all they did or if they just followed the TSB?

jimlem · August 6, 2015

Picked up the truck from dealer today. I'm very impressed with the job they did on the frame. It appears that the entire frame was done, not just the bad spots. They also coated the rear axle, and the truck been detailed when I picked it up.

How do you know they did the 2 step TSB procedure if they covered it all with undercoating? I've never known a dealer to give something free unless it suits them.

Kokanee kid · March 19, 2016

Does someone have the tsb number for a 2015 Sierra frame rust issue? Thanks

Rock1500 · March 21, 2016

Wow my truck has the same rust as you did and it looks like it came out good for you. I think I will have to call it in then and have them touch up my truck as I see rust all over.

Do people know what tsb is this so I can refer it on the call?

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nick3941sd · March 22, 2016

Has the GM 12346501 been discontinued? I am unable to find it. What's a good alternate?

Rock1500 · March 22, 2016

My truck is going in on Friday for an inspection and then determination if they will do anything that day. Considering i see rust and i had to point to them the TSB in question, they will have to do something. When I get it, i will inspect it to make sure they do it right.

Kokanee kid · March 24, 2016

And the TSB in question number is ..................?

Jacksfan98 · March 24, 2016

I took my truck in for this TSB and they did a crappy job! Most of the rust is already showing through and they did not drop the spare tire and spray that area of the frame. I will let the dealer worry about it since they are getting it back when my new truck arrives.

Rock1500 · March 24, 2016

And the TSB in question number is ..................?

http://www.silveradosierra.com/exterior/service-bulletin-for-underbody-rust-on-2014-trucks-t257386.html

The link has a post with the pdf.

14002a.

What gets me is in that bullentin it states that they should have done this with trucks on their lot before selling them which clearly mine wasn't since it was on their lot for a while. But then again no one in services knew or could find the tsb till I should them the first page of the pdf.

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Marticus · March 25, 2016

Here is the TSB from Alldata I'm having trouble with the pictures but they are similar to the one that blacksvt posted

# PI0281D: Underbody Component Corrosion - (Jan 16, 2014)

Subject:            Underbody Component CorrosionModels:             2015 and Prior GM Passenger Cars and Light Duty Trucks

This PI has been revised to add model years. Please discard PI0281C.

The following information may be helpful when addressing underbody component corrosion with customers.

Some customers may comment that one or more of their vehicle's underbody components are showing some form of corrosion.

This corrosion may be red in appearance (rust) if the component is steel, forged iron or cast iron.

This corrosion may also be grey or white in color if the component is constructed of an aluminum alloy.

Note :

Extended outside storage may increase the opportunity for brake rotor rust. Vehicle braking systems tend to be self-cleaning while vehicles are in use, preventing any build-up of corrosion on the brake rotor surfaces. At times more extensive corrosion can cause pulsation due to thickness variation. This usually happens when the vehicle is parked for long periods of time in humid type conditions and the braking surface area under the pads corrode at a different rate compared to the rest of the braking surface area. Cleaning up of braking surfaces (burnishing) can be accomplished by 10-15 moderate stops from 56-64 km/h (35-40 mph) with cooling time between stops. If multiple, moderate braking stops do not correct this condition, refer to the latest version of Corporate Bulletin Number 00-05-22-002 - Disc Brake Warranty Service and Procedures for additional information.

Corrosion Protection

General Motors uses a large variety of materials in the manufacture of vehicles. Many of these components undergo an extensive corrosion protection process. These components include major body structures, powertrain, wiring and electrical components and various other areas of the vehicle. General Motors engineering determines the effects of corrosion on every vehicle component.

Acceptable Corrosion

General Motors has determined that the performance of some components is not affected by surface corrosion and no longer takes preventative steps on these parts.

Rust

This corrosion may be red or brown in appearance if the component is made of steel, forged iron or cast iron.

These are typical underbody or mechanical components such as but not limited to propshafts, propshaft yokes, U-joint, steering knuckles, brake rotors and calipers, axle housings, springs, shock absorbers, suspension control arms, tie rod ends and exhaust system components. As the rust ages, it turns from an orange-red like appearance to a darker brown like appearance.

Aluminum Oxidation

Cast aluminum alloy components may appear to have a grey or white coating on the surface commonly known as "surface oxidation." Uncoated aluminum alloys begin to oxidize as soon as it is exposed to the atmosphere. This coating does not affect the serviceability or performance of the component.

Many mechanical components are cast in aluminum alloys, these components may include, but are not limited to oil pans, valve covers, transmission and transfer case housings, steering gears and axle housings

Typical Appearance

Recommendation

No repair or consideration should be given for this concern. Surface corrosion on unprotected components will vary with age and exposure. Corrosion on these components has no detrimental impacts, either in short or long term durability.

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