2016 - 2019 Corvette: Service Bulletin: #21-NA-109: Diagnostic Information on Engine Vibration - (May 3, 2021)

#21-NA-109: Diagnostic Information on Engine Vibration - (May 3, 2021)

Subject Diagnostic Information on Engine Vibration

This bulletin replaces PIP5503B. Please discard PIP5503B.


Brand:

Model:

Model Year:

VIN:

Engine:

Transmission:

from

to

from

to

Cadillac

CTS-V

2016

2019

4.3L (LV1, LV3), 5.3L (L82, L83, L84) or 6.2L (L86, L87, LT1 or LT1 w/o Z52 (Corvette only), LT4)

Escalade Models

2015

2020

Escalade Models

2021

2021

Chevrolet

Camaro

2016

2021

Corvette

2016

2019

Express

2018

2021

Silverado

2014

2018

Silverado LD

2019

2019

Silverado 1500 (New Model)

2019

2019

Silverado 1500

2020

2021

Suburban

2015

2020

Suburban

2021

2021

Tahoe

2015

2020

Tahoe

2021

2021

GMC

Savana

2018

2021

Sierra

2014

2018

Sierra Limited

2019

2019

Sierra 1500 (New Model)

2019

2019

Sierra 1500

2020

2021

Yukon Models

2015

2020

Yukon Models

2021

2021

 

Involved Region or Country

North America, Europe, Russia, Middle East, Israel, Chile, Colombia, Ecuador, Venezuela, Japan, GM Korea Company, Cadillac Korea (South Korea), China, Thailand, Singapore, Philippines, Other Africa, Australia/New Zealand

Condition

Some customers may have a concern with an engine vibration. This vibration may occur when vehicle is stationary or accelerating from a stop. 

It may be found that the engine oil was recently changed.

Cause

This may be caused by the engine being overfilled with oil.

Information

If the above concern is encountered, it is recommended to check the engine oil level. Refer to the vehicle owner manual for details on correctly checking engine oil level.

A vibration caused by a crankcase overfilled with engine oil will typically display Engine 1 (E1) as the dominant vibration when monitored with the PICO Scope.

  • If the engine oil level is confirmed to be overfull, verify if the crankcase was overfilled with engine oil or is contaminated by an outside substance such as fuel or coolant.
  • If the engine was overfilled with only engine oil, adjust the oil level and re-evaluate the concern (possibly the result of the engine oil having been overfilled during an oil change or maintenance service).
  • If the engine oil level was overfull as a result of contamination, determine the source of the contamination and repair as needed.

Version

1

Modified

Released May 03, 2021

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