2015 - 2019 Corvette: Service Bulletin: #18-NA-285: Information on Slight Movement in Park at Ignition On and Vehicle Start Up and/or During a Remote Vehicle Start Event - (Jan 22, 2021)

#18-NA-285: Information on Slight Movement in Park at Ignition On and Vehicle Start Up and/or During a Remote Vehicle Start Event - (Jan 22, 2021)

Subject:  Information on Slight Movement in Park at Ignition On and Vehicle Start Up and/or During a Remote Vehicle Start Event

This bulletin replaces PIP5293A. Please discard PIP5293A.

Brand:

Model:

Model Year:

VIN:

Engine:

Transmission:

(8 Speed Automatic)

from

to

from

to

Cadillac

ATS

2016

2019

—

—

—

M5U, M5N

CTS

CT4

2020

2021

M5N

CT6

2016

2018

M5N, M5X

Escalade Models

2015

2017

M5U

Chevrolet

Camaro

2016

2021

M5T, M5U

Colorado

2017

2021

M5T

Corvette

2015

2019

M5U

Express

2017

2021

M5U MQD

Silverado Models

2015

2018

M5U, M5X

Silverado 1500 (New Model)

2019

2019

M5U M5X MQE

Silverado 1500

2020

2021

GMC

Canyon

2017

2021

M5T

Savana

2017

2021

M5U MQD

Sierra Models

2015

2018

M5U, M5X

Sierra 1500 (New Model)

2019

2019

M5U M5X MQE

Sierra 1500

2020

2021

Yukon Models

2015

2017

M5U

 

Involved Region or Country

North America, Argentina, Brazil, Chile, Guatemala, Peru, Europe, Israel, Middle East, China, Japan, Philippines, Thailand, Cadillac Korea, GM Korea Company

Condition

Some customers may comment that the vehicle may rock or move slightly forward or rearward while in Park at start up and/or when using the remote vehicle start function.

  • This condition may be accompanied by a clunk noise.

Cause

This condition may be caused by the application of the 1-2-7-8 Reverse Clutch and the 1-2-3-4-5 Reverse Clutch in addition to residual transmission fluid in the other clutch packs creating a partial apply on start up.

  • The movement may be more apparent at Ignition On, during a remote vehicle start. As the 1-2-7-8 Reverse Clutch and the 1-2-3-4-5 Reverse Clutch are applied at Ignition On, the engine and portions of the transmission are at full idle speed causing the clutches to apply at a quicker rate than during a normal start. This movement is stopped by the park pawl and/or the transmission fluid exhausting completely from the clutch packs.

Correction

This condition is normal and no repairs should be attempted. This can be verified by comparing with another identically built vehicle under the same conditions.

Parts Information

No parts are required for this repair.

Version

2

Modified

Released September 21, 2018

January 22, 2021 – Added the 2020-2021 Model Years, additional Models and updated the Involved Region or Country section.

 


Article ID: 1486
Created: January 25, 2021
Last Updated: January 25, 2021

Online URL: https://www.corvetteactioncenter.com/tech/knowledgebase/article/2015-2019-corvette-service-bulletin-18-na-285-information-on-slight-movement-in-park-at-ignition-on-and-vehicle-start-up-and-or-during-a-remote-vehicle-start-event-jan-22-2021-1486.html