2015 - 2019 Corvette: Service Bulletin: #16-NA-361: Information on Transmission Harsh 1-2 Shift Upon First Start Up/Shift of the Day Under Light Throttle

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#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

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

Modified

Nov. 18, 2016 - Revised the Cause section.

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