Supporting Vendors / Dealers - Advertising - Shop

2015 - 2017 Corvette: Service Bulletin: #16-NA-361: Information on Transmission Harsh 1-2 Shift Upon First Start Up/Shift of the Day Under Light Throttle

#16-NA-361: Information on Transmission Harsh 1-2 Shift Upon First Start Up/Shift of the Day Under Light Throttle - (Apr 6, 2017)

Subject Information on Transmission Harsh 1-2 Shift Upon First Start Up/Shift of the Day Under Light Throttle

Brand:

Model:

Model Year:

VIN:

Engine:

Transmission:

from

to

from

to

Cadillac

ATS

2016

2017

     

Automatic 8L45, 8L90 (M5T, M5N, M5U, M5X)

CTS Models

CT6

Escalade Models

2015

Chevrolet

Camaro

2016

2017

     

Corvette

2015

2017

     

Silverado

GMC

Sierra

2015

2017

     

Automatic 8L90 (M5U, M5X)

Yukon

 

Involved Region or Country

North America and N.A. Export Regions

Condition

Some customers may comment that the transmission exhibits a harsh 1-2 shift on the first shift of the day, typically under light throttle.

Cause

This condition is due to the initial clutch fill time of the 2-3-4-6-8 (C4) clutch.

Information

Some customers may experience a flare condition on the first 1-2 shift of the day or after the vehicle has been parked for several hours. The condition may have developed after the replacement of a complete transmission assembly or the replacement of the stator support to correct a delayed engagement condition. This is most likely to occur under light throttle conditions. Subsequent 1-2 shifts have acceptable shift feel. Replacing transmission components will not correct the condition.  

Correction

Important: Replacing transmission components or complete assemblies will not improve the condition.

The first 1-2 shift of the day may be harsh. The customers’ vehicle should be compared to a like vehicle under the same driving conditions. Do Not replace any parts for this condition.

Note: This condition will not impact the designed performance or reliability of the vehicle.

 

Version

3

Modified

Nov. 18, 2016 - Revised the Cause section.

April 6, 2017 - Added models and Revised the Condition, Cause and Correction sections.

0 (0)
Article Rating (No Votes)
Rate this article
Attached Files
There are no attachments for this article.
Comments
There are no comments for this article. Be the first to post a comment.
Name
Email
Security Code Security Code
Related Articles RSS Feed
2015 - 2016 Corvette: Service Bulletin: #16-NA-014: Delayed Engagement After Sitting With Engine Off
Viewed 3038 times since Sun, Jul 3, 2016
2006 - 2014 Corvette: Service Bulletin: #PIP5429: 2-3 Upshift Slip or Flare - (Oct 10, 2016)
Viewed 1246 times since Thu, Oct 13, 2016
2016 Corvette: Recall: 16038 Transmission Oil Cooler Line in Contact with Body Stud
Viewed 631 times since Mon, Jan 23, 2017
2016 Corvette: Service Bulletin: Delayed Engagement After Sitting With Engine Off
Viewed 901 times since Fri, Jun 10, 2016
2015 - 2017 Corvette: Service Bulletin: #PIP5437B: 8L45 8L90 Diagnostic Tips for Harsh Shifts and Delayed or Harsh Garage Shift Engagements
Viewed 315 times since Fri, May 26, 2017
2016 - 2017 Corvette: Service Bulletin: #PIP5447B: P3400 setting with 8 speed only - (Apr 4, 2017)
Viewed 266 times since Thu, Apr 6, 2017
2015 Corvette: GM Press Release: New 8-Speed Enables Quicker, More Efficient Corvette
Viewed 956 times since Wed, Aug 20, 2014
2015 - 2016 Corvette: Service Bulletin: Diagnostic Tip for Harsh Shifts After Mileage Accumulation Without Previous Transmission Repairs and/or Calibration Updates
Viewed 1797 times since Thu, Jun 30, 2016
2014 - 2016 Corvette: Service Bulletin: #16-NA-250: Slow Cranking, Dead Battery and/or No Start
Viewed 893 times since Wed, Aug 10, 2016