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2020 GMC Sierra 5.3L - Clear leak + engine light

Jbrockltd
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Jbrockltd New Member

Jbrockltd

Posted
Posted (edited)

Hi everyone! 
 

just hopped into my first GMC Sierra 2020. Traded in my 2017 Tacoma which went 80,000km without an issue. 2-days in now and I’ve got an engine light, and clear water leaking from underneath the truck. It’s leaking from the joint with the two tubes which I’ve attached a picture of. Any thoughts on what this is?? I’ll be calling the dealership but just want to see if this is common? 
 

also... anyone else notice the poor undercoat? Used my thumb to rub the undercoat right off to steel... 

CA961A18-BBAE-48BE-9D32-612536DC0E9A.jpeg

CCC5A897-EB29-4725-BA04-C29739F9FDB5.jpeg

Edited by Jbrockltd
Transient Senior Enthusiast

Transient

Posted
Posted

First, the water is condensation from the AC. Even Toyotas do it. Everything is fine.

Second, that's not a poor undercoat. It's a wax undercoat. GM offers to use wax on the frame to resist rust because they believe it is better than what everybody uses, and it's self-healing. Give it a little bit of time and that spot where you rubbed your finger on it should smooth out and recover the frame.

Sent from my SM-N960U using Tapatalk

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steve841 Enthusiast

steve841

Posted
Posted (edited)

And for the CEL, welcome to the world of GM and poor software programming and the total inability to deliver OTA fixes (Sadly - like most OEM's).  GM lives by the motto - "If no one complains, it works just fine"

 

Chances are, you'll have several software updates needing to be applied to your vehicle.  Visit the dealer.

Edited by steve841
  • Like 1
Pinnacle Enthusiast

Pinnacle

Posted
Posted
16 hours ago, Transient said:

First, the water is condensation from the AC. Even Toyotas do it. Everything is fine.

Second, that's not a poor undercoat. It's a wax undercoat. GM offers to use wax on the frame to resist rust because they believe it is better than what everybody uses, and it's self-healing. Give it a little bit of time and that spot where you rubbed your finger on it should smooth out and recover the frame.

Sent from my SM-N960U using Tapatalk
 

LOL love the self healing part.  Umm no it doesnt thats where the rust starts. Nothings better then a fully primed sealed and painted frame like RAM and Ford and Toyota use. 

Pinnacle Enthusiast

Pinnacle

Posted
Posted
19 hours ago, Jbrockltd said:

Hi everyone! 
 

just hopped into my first GMC Sierra 2020. Traded in my 2017 Tacoma which went 80,000km without an issue. 2-days in now and I’ve got an engine light, and clear water leaking from underneath the truck. It’s leaking from the joint with the two tubes which I’ve attached a picture of. Any thoughts on what this is?? I’ll be calling the dealership but just want to see if this is common? 
 

also... anyone else notice the poor undercoat? Used my thumb to rub the undercoat right off to steel... 

CA961A18-BBAE-48BE-9D32-612536DC0E9A.jpeg

CCC5A897-EB29-4725-BA04-C29739F9FDB5.jpeg

Bad gasket if thats where its coming from.  Just good ol GM... more problems to come. 

carkhz316 Enthusiast

carkhz316

Posted
Posted
10 hours ago, steve841 said:

GM lives by the motto - "If no one complains, it works just fine" "it's not a bug, it's a feature." lol

 

 

34 minutes ago, Pinnacle said:

LOL love the self healing part.  Umm no it doesnt thats where the rust starts. Nothings better then a fully primed sealed and painted frame like RAM and Ford and Toyota use. 

Can't help but agree to some extent. All of those with painted frames seem to stay cleaner, for longer than the GM twins; at least around here in MN.

  • Like 1
Jbrockltd New Member

Jbrockltd

Posted
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Posted
8 minutes ago, carkhz316 said:

 

Can't help but agree to some extent. All of those with painted frames seem to stay cleaner, for longer than the GM twins; at least around here in MN.

So essentially the frame undercoat isn’t something the dealership will remedy... and I’m assuming best for me to undercoat it myself? Haha 

Pinnacle Enthusiast

Pinnacle

Posted
Posted
35 minutes ago, Jbrockltd said:

So essentially the frame undercoat isn’t something the dealership will remedy... and I’m assuming best for me to undercoat it myself? Haha 

yes, It took me about 40 hours to clean my frame and then prime paint it myself. 

Jbrockltd New Member

Jbrockltd

Posted
  • Author
Posted
3 minutes ago, Pinnacle said:

yes, It took me about 40 hours to clean my frame and then prime paint it myself. 

Well that’s exciting! Too many pros & cons with full size trucks it’s ridiculous. At $60k plus you’d think they would make em a bit better... hopefully I don’t regret not getting a Ford ?‍♂️ They seemed to have there fair share of problems as well... 

Pinnacle Enthusiast

Pinnacle

Posted
Posted
14 minutes ago, Jbrockltd said:

Well that’s exciting! Too many pros & cons with full size trucks it’s ridiculous. At $60k plus you’d think they would make em a bit better... hopefully I don’t regret not getting a Ford ?‍♂️ They seemed to have there fair share of problems as well... 

Or you coulda stayed with Toyota, i just picked up a new Tundra

Colossus Senior Enthusiast

Colossus

Posted
Posted

Well you are better off than in a Ford, that's for sure.  But what kept you from going to a Tundra?  Just curious. 

Transient Senior Enthusiast

Transient

Posted
Posted
LOL love the self healing part.  Umm no it doesnt thats where the rust starts. Nothings better then a fully primed sealed and painted frame like RAM and Ford and Toyota use. 

1) Yet, the fully primed, sealed, and painted frames are rusting. 

2) I did point out that's what GM is saying. Those aren't my words. The product GM uses is called Nox-Rust. GM also has a TSB on treating rusty frames.

 

https://www.google.com/url?sa=t&source=web&rct=j&url=https://static.nhtsa.gov/odi/tsbs/2019/MC-10154649-9999.pdf&ved=2ahUKEwiPtpiN77frAhVIQq0KHUI0BcoQFjALegQIAhAB&usg=AOvVaw0r4K_YpNNsZLqu9ln1KW8L

 

Sent from my SM-N960U using Tapatalk

 

 

 

 

 

Pinnacle Enthusiast

Pinnacle

Posted
Posted
6 minutes ago, Transient said:

1) Yet, the fully primed, sealed, and painted frames are rusting. 

2) I did point out that's what GM is saying. Those aren't my words. The product GM uses is called Nox-Rust. GM also has a TSB on treating rusty frames.

 

https://www.google.com/url?sa=t&source=web&rct=j&url=https://static.nhtsa.gov/odi/tsbs/2019/MC-10154649-9999.pdf&ved=2ahUKEwiPtpiN77frAhVIQq0KHUI0BcoQFjALegQIAhAB&usg=AOvVaw0r4K_YpNNsZLqu9ln1KW8L

 

Sent from my SM-N960U using Tapatalk

 

 

 

 

 

On a much slower pace.  And it doesn't matter what gm calls it it doesn't heal itself I worked for gm and never seen it 

Transient Senior Enthusiast

Transient

Posted
Posted
On a much slower pace.  And it doesn't matter what gm calls it it doesn't heal itself I worked for gm and never seen it 

Again, not my claim. It's GM's. However, I'm not seeing anybody provide supporting evidence, such as numbers. It's only anecdotal claims. Here's a counterclaim, but unfortunately no numbers are provided either.

 

https://chevroletforum.com/articles/is-wax-frame-coating-the-secret-to-success-for-chevy-trucks/

 

Sent from my SM-N960U using Tapatalk

 

 

 

Jbrockltd New Member

Jbrockltd

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Posted
3 hours ago, Colossus said:

Well you are better off than in a Ford, that's for sure.  But what kept you from going to a Tundra?  Just curious. 

I wasn’t able to test drive a tundra this year but just felt like there should be more motor options. Fuel economy was better on the GMC, and overall just get like more of a truck. Looks a lot better in my opinion too. Which was hard to accept since I love Toyota... just felt like there wasn’t any great options leaving the Tacoma. See the Sierra everywhere, use gmc vans for plumbing and they typically last 300,000+. 

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