20' Sierra Idle Vibration (2.7)

[ESierra]

When purchasing the truck in late December 2021 with 18k miles, I don't recall this occurring. Since then, June 29th, I've put on 16,000 miles. I do my oil changes every 2 months or 5,000 miles per the recommended in the service manual, and they are always done at GMC Dealerships due to the cost, and convinence. 

 

This morning (6/29) I've turned on the truck, and I usually let the truck idle for a few minutes before driving. I noticed that in the drivers seat, some sort of vibrations coming from the engine bay. I noticed additionally that the RPMs are a little less than the number 1,000RPM. My feet are not on the brakes or the gas pedal. I immediately turn off Auto Start Stop each time I get into the truck, I find it annoying. When driving no other vibrations occur, truck drives like a dream. 

 

In April, I noticed the vibrations again but this time it was not upon start up, it occured when I got to my destination and say idle in Park. I was curious, so I turned off the truck and turned it back on, and no vibrations then. 

 

I've been reading on fourms that other users experienced, spark plugs needed to be changed, or injectors Etc. I should note, I only use the recommend gas 87. I've ran 91 before, but due to gas prices increasing, I don't see the benefit. Being that my truck is just short of the factory warranty (36,000), I've thought about bringing it in to get looked at by a Service Tech at a local GMC dealership. 

 

I've always been taught to drive a car/truck until you see a CEL then bring it in, so they can actually diag. 

 

TLDR: Truck vibrates at random times, only at idle. Potentially DFM? 

 

[silveradosid]

my 2020 2.7 does this also. it is also intermittent, some mornings it seems to misfire but most times it is fine. mine will also do it sometimes stopped at a red light

[ESierra]

1 hour ago, silveradosid said:

my 2020 2.7 does this also. it is also intermittent, some mornings it seems to misfire but most times it is fine. mine will also do it sometimes stopped at a red light

I wonder if this is related to the DFM... Even if it is, kind of sucks. But other than that I can't really complain about it. I'd be more curious as time goes by how it handles. I rack up 25k miles a year, so I'll hit 100k sooner than most will in 6 years of ownership. 

[silveradosid]

i am at 38k now, does not seem to have gotten any worse. i also have an intermittent high pitch squealing noise at start up that only last a few seconds 

[GMCustomerService]

On 6/29/2022 at 9:04 AM, ESierra said:

When purchasing the truck in late December 2021 with 18k miles, I don't recall this occurring. Since then, June 29th, I've put on 16,000 miles. I do my oil changes every 2 months or 5,000 miles per the recommended in the service manual, and they are always done at GMC Dealerships due to the cost, and convinence. 

 

This morning (6/29) I've turned on the truck, and I usually let the truck idle for a few minutes before driving. I noticed that in the drivers seat, some sort of vibrations coming from the engine bay. I noticed additionally that the RPMs are a little less than the number 1,000RPM. My feet are not on the brakes or the gas pedal. I immediately turn off Auto Start Stop each time I get into the truck, I find it annoying. When driving no other vibrations occur, truck drives like a dream. 

 

In April, I noticed the vibrations again but this time it was not upon start up, it occured when I got to my destination and say idle in Park. I was curious, so I turned off the truck and turned it back on, and no vibrations then. 

 

I've been reading on fourms that other users experienced, spark plugs needed to be changed, or injectors Etc. I should note, I only use the recommend gas 87. I've ran 91 before, but due to gas prices increasing, I don't see the benefit. Being that my truck is just short of the factory warranty (36,000), I've thought about bringing it in to get looked at by a Service Tech at a local GMC dealership. 

 

I've always been taught to drive a car/truck until you see a CEL then bring it in, so they can actually diag. 

 

TLDR: Truck vibrates at random times, only at idle. Potentially DFM? 

 

This is certainly not what we like to hear, ESierra.  Please know, customer satisfaction is extremely important to us. Our team would be more than happy to take a closer look into the concerns with your truck. To do so, please send an email to [email protected] with ATTN: ESierra/GM Trucks in the subject line.

Please include your contact information, VIN, a brief description of your concern, and the name of your preferred dealership. We look forward to hearing from you. To learn more about GM’s privacy policy, please visit https://www.gm.com/privacy-statement.html.
 
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