2017 Corvette: Service Bulletin: #16-NA-404: Harsh Shift, Delayed Shift, unwanted Downshift, Transmission Stuck in One Gear, Erratic Shifting, Hesitation or Have a Malfunction Indicator Lamp (MIL) Illuminated

#16-NA-404: Harsh Shift, Delayed Shift, unwanted Downshift, Transmission Stuck in One Gear, Erratic Shifting, Hesitation or Have a Malfunction Indicator Lamp (MIL) Illuminated - DTC P0747, P0777, P0797, P2715 or P2724 May Be Set Current or History in Transmission Control Module - (Apr 7, 2017)

Subject Harsh Shift, Delayed Shift, Unwanted Downshift, Transmission Stuck in One Gear, Erratic Shifting, Hesitation or Have a Malfunction Indicator Lamp (MIL) Illuminated - DTC P0747, P0777, P0797, P2715 or P2724 May Be Set Current or History in Transmission Control Module

Brand:

Model:

Model Year:

VIN:

Engine:

Transmission:

from

to

from

to

Cadillac

ATS

2017

2017

SOP

December 6, 2016

 

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

CTS

CT6

November 17, 2016

Escalade

December 16, 2016

Chevrolet

Camaro

2017

2017

SOP

December 6, 2016

 

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

Corvette

December 8, 2016

Silverado

December 16, 2016

Suburban

Tahoe

GMC

Sierra

2017

2017

SOP

December 16, 2016

 

Automatic 8L90 (M5U, M5X)

Yukon

 

Involved Region or Country

North America and N.A. Export Regions

Condition

Some customers may comment that one or more of the following conditions:

  • Harsh shift
  • Delayed shift
  • Unwanted downshift
  • Transmission stuck in one gear
  • Erratic shifting
  • Hesitation between shifts
  • MIL illuminated

The technician may find one or more of the following DTCs set:

  • P0747
  • P0777
  • P0797
  • P2715
  • P2724

Cause

This condition may be caused by a calibration anomaly in the Transmission Control Module (TCM).

Correction

If you encounter a vehicle with the above concern, reprogram the Transmission Control Module (TCM) with the latest software available on TIS2WEB.

Warranty Information

For vehicles repaired under warranty, use:

Labor Operation

Description

Labor Time

2810175

Transmission Control Module Reprogramming with SPS

Use Published Labor Operation Time

Service Procedure

Important: Stable battery voltage is critical during programming. Any fluctuation, spiking, over voltage or loss of voltage will interrupt programming. Install the EL-49642 SPS Programming Support Tool to maintain system voltage. If not available, connect a fully charged 12 V jumper or booster pack disconnected from the AC voltage supply. DO NOT connect a battery charger.

Note: After updating the TCM, complete K71 Transmission Control Module – Setup to run the Service Fast Learn procedure.

Update the TCM to the latest software and calibration available on TIS2WEB. Refer to K71 Transmission Control Module: Programming and Setup in SI.

 

Version

2

Modified

April 7, 2017 - Updated the Subject and Condition sections.

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