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Transmission Control Module Offline Event (PIT5770)

WARNING: This page is about the Yukon Denali, 3.0L Eng VIN T, 4WD, which is a different variant/trim than selected.
Publication date: 2020-09-17
Reference number: PIT5770
Supersedes refnos: 20-NA-189

TRANSMISSION CONTROL MODULE OFFLINE EVENT

TRANSMISSION CONTROL MODULE OFFLINE EVENT

TECHNICAL SERVICE BULLETIN

Reference Number(s): 20-NA-189, Date of Issue:  Sep 17, 2020
Supercedes: This Bulletin Replaces PIT5770. Please Discard all copies of PIT5770.

SERVICE INFORMATION

Brand: Model: Model Year: VIN: Engine: Transmission:
from to from to
Chevrolet Suburban
Tahoe		 2021 2021        
GMC Yukon
Yukon XL		 2021 2021
Involved Region or Country   
Additional Options (RPOs)   
Condition  Some customers may comment on any of the following:
  • The vehicle having a Power up but No Crank condition
  • Ignition is stuck in the Accessory On position
  • A Shift to Park error message was displayed before shutting off
  • Service Engine Soon (SES) Malfunction Indicator Lamp (MIL) displayed
  • The vehicle having a Harsh Transmission Shifting condition

Technician may find DTC U0101 (Lost communication with Transmission Control Module) set current or in history.
Cause  The cause of the condition may be an anomaly in the current Transmission Control Module software.
Correction  Reprogram Transmission Control Module.

SERVICE PROCEDURE

CAUTION:

Before downloading the update files, be sure the computer is connected to the internet through a network cable (hardwired). DO NOT DOWNLOAD or install the files wirelessly. If there is an interruption during programming, programming failure or control module damage may occur.

NOTE:

Carefully read and follow the instructions below.

  • Ensure the programming tool is equipped with the latest software and is securely connected to the data link connector. If there is an interruption during programming, programming failure or control module damage may occur.
  • Stable battery voltage is critical during programming. Any fluctuation, spiking, over voltage or loss of voltage will interrupt programming. Install a GM Authorized Programming Support Tool to maintain system voltage. Refer to www.gmdesolutions.com for further information. 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.
  • Ensure the ignition is turned OFF, load on the vehicle's battery such as; interior lights, exterior lights (including daytime running lights), HVAC, etc. may affect the download process.
  • Clear DTCs after programming is complete. Clearing powertrain DTCs will set the Inspection/Maintenance (I/M) system status indicators to NO.
GM5644477Courtesy of GENERAL MOTORS COMPANY
GM5431207Courtesy of GENERAL MOTORS COMPANY
IMPORTANT:

Techline Connect and TIS2WEB screens shown above.

IMPORTANT:

If the Same Calibration/Software Warning is noted on the TLC or SPS Summary screen, select OK and follow on-screen instructions. The system will generate a warranty claim code (WCC) for documentation purposes only. Perform service information (SI) diagnostics to determine the cause of the condition. Use the applicable labor operation code when submitting a warranty claim. DO NOT use the WCC with the warranty claim submission.

IMPORTANT:

When programming a module in GM's new Vehicle Intelligence Platform, or VIP, the power mode (ignition) needs to be off or errors may occur. This involves the 2020 Chevrolet Corvette, Cadillac CT5 and CT4, as well as the upcoming full-size Chevrolet, GMC, Cadillac SUVs and Buick Envision. Serial Data Message Authentication also needs to have the ignition off.

  1. Reprogram the Transmission Control Module. Refer to K71 Transmission Control Module: Programming and Setup (10L80 (MQC))  in SI.
    GM5644478Courtesy of GENERAL MOTORS COMPANY
    GM5431209Courtesy of GENERAL MOTORS COMPANY
    IMPORTANT:

    To avoid warranty transaction rejections, you MUST  record the warranty claim code provided on the SPS Warranty Claim Code (WCC) screen shown above on the job card. Refer to callout 1 above for the location of the WCC on the SPS screen

  2. Record SPS Warranty Claim Code on job card for warranty transaction submission.

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
IMPORTANT:

*To avoid warranty transaction rejections, carefully read and follow the instructions below:

  • The SPS Warranty Claim Code must be accurately entered in the "SPS Warranty Claim Code" field of the transaction.
  • When more than one Warranty Claim Code is generated for a programming event, it is required to document all Warranty Claim Codes in the "Correction" field on the job card. Dealers must also enter one of the codes in the "SPS Warranty Claim Code" field of the transaction, otherwise the transaction will reject. It is best practice to enter the FINAL code provided by SPS/SPS2.

Warranty Claim Code Information Retrieval 

If the SPS Warranty Claim Code was not recorded on the Job Card, the code can be retrieved in the SPS system as follows:

  1. Open TLC/TIS on the computer used to program the vehicle.
  2. Select and start SPS/SPS2.
  3. Select Settings.
  4. Select the Warranty Claim Code tab.

The VIN, Warranty Claim Code and Date/Time will be listed on a roster of recent programming events. If the code is retrievable, dealers should resubmit the transaction making sure to include the code in the SPS Warranty Claim Code field.

SERVICE INFORMATION

Version  1
Modified  Released September 16, 2020
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