2016 - 2021 Cadillac ATS-V -CTS-V - CT4-V: 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)
Brand:	Model:	from	to	from	to	Engine:	Transmission: (8 Speed Automatic)
Cadillac	ATS	2016	2019	—	—	—	M5U, M5N
	CTS	2016	2019				M5U, M5N
	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				M5U M5X MQE
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				M5U M5X MQE
	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

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: 50
Created: January 25, 2021
Last Updated: January 25, 2021

Online URL: https://www.cadillacvnet.com/knowledge-base/article/2016-2021-cadillac-ats-v-cts-v-ct4-v-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-22-2021-50.html