Bulletin No.:

Service Bulletin

Date:

19-NA-151
October, 2023

TECHNICAL
Subject:

Malfunction Indicator Lamp (MIL) Illuminated - DTCs U0101, U102, U0129, U0140 and/or
U18A2 Set
The bulletin replaces PIT5664A. Please discard PIT5664A.

Brand:

Model:

Chevrolet

Silverado 1500
(New Model)

GMC

Sierra 1500
(New Model)

Model Year:
from

2019

to

2019

Involved Region or Country

North America

Additional Options (RPOs)

KL9 (Auto Start/Stop)

VIN:
from

to

SOP

1GTU9BED4KZ287517
(Fort Wayne Assembly)
3GTU9DED4KG159404
(Silao Assembly)

Engine:

Transmission:

L84, L87

Some dealers may notice the MIL Illuminated.
Condition

Cause

Correction

⇒ When checking for DTC's, only the ECM will have set loss of communication
codes: U0101, U102, U0129, U0140, and/or U18A2. There will be no other
loss of communication related symptoms.
This condition may be caused by stock units that have been sitting on the lot with a
battery that has not been properly maintained.
Important: As part of a properly maintained inventory vehicle, the battery should be
checked every 30 days using the DCBS Tool (EL-50313) in the PDI mode, per bulletin
21-NA-043: Properly Maintaining Vehicles in Dealer Inventory.
If vehicle was built before the VIN breakpoint noted above, it will be necessary to charge
the battery using the DCBS and reprogram the ECM with updated calibration available in
Tis2Web.

⇒ If the ECM has already been reprogrammed for this concern, then follow
service information for the applicable DTC.

Copyright 2023 General Motors LLC. All Rights Reserved.

Page 2

October, 2023

Bulletin No.: 19-NA-151

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 (GM Dealer
Equipment Item #PSC-550) 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.
Refer to K20 Engine Control Module: Programming and
Setup in SI.

Parts Information
No parts are required for this repair.

Warranty Information
For vehicles repaired under warranty, use:
Labor Operation
2810075

Description

Labor Time

Engine Control Module Reprogramming with SPS

Use the Published Labor
Operations Time

To avoid warranty transaction rejections, carefully read and follow the instructions below:
• The VIN and the job card number on the transaction must match the VIN and job card number associated with the
reprogramming event in the SPS system.
• 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.

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 TIS on the computer used to program the
vehicle.
2. Select and start SPS.
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.

Version

2

Modified

Released July 10, 2019
Revised October 12, 2023 – Changed Bulletin 09–00–89–002 to 21–NA-043.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.

WE SUPPORT VOLUNTARY
TECHNICIAN
CERTIFICATION