NHTSA ID Number: 11036194
Manufacturer Communication Number: PIT6512A
TSB/Document Date: 2026-08-14
Summary
This PI states that if SDGM DTC P0604/P0607 is set and no other SDGM DTCs are present, clear DTCs and reset the SDGM. Advises of how to contact PQC to authorize SDGM replacement.
Bulletin No.: PIT6512A
Service Bulletin
Date: August, 2026
PRELIMINARY INFORMATION
Subject:
Brand:
SDGM DTC P0604 and/or P0607 – Interim Reset Procedure and Part Restriction
Model:
Model Year:
from
VIN:
to
from
to
Enclave
2025 - 2026
All
All
All
All
Envision
2023 - 2026
All
All
All
All
Cadillac
CT5
2025 - 2026
All
All
All
All
Cadillac
CELESTIQ
2025 - 2026
All
All
All
All
Cadillac
Escalade
2025 - 2026
All
All
All
All
Escalade
ESV
2025 - 2026
All
All
All
All
Escalade IQ
2025 - 2026
All
All
All
All
Cadillac
Escalade IQL 2025 - 2026
All
All
All
All
LYRIQ
2023 - 2026
All
All
All
All
OPTIQ
2025 - 2026
All
All
All
All
VISTIQ
2026
All
All
All
All
Cadillac
XT4
2024 - 2025
All
All
All
All
Blazer EV
2024 - 2026
All
All
All
All
Chevrolet
2027
All
All
All
All
Colorado
2023 - 2026
All
All
All
All
Corvette
2024 - 2026
All
All
All
All
Equinox
2025 - 2026
All
All
All
All
Equinox EV
2024 - 2026
All
All
All
All
Chevrolet
Silverado EV
2024 - 2026
All
All
All
All
Chevrolet
Tahoe
2025 - 2026
All
All
All
All
Chevrolet
Traverse
2024 - 2026
All
All
All
All
Acadia
2024 - 2026
All
All
All
All
Canyon
2023 - 2026
All
All
All
All
2023 - 2026
All
All
All
All
2024 - 2026
All
All
All
All
Sierra EV
2024 - 2026
All
All
All
All
GMC
Terrain
2025 - 2026
All
All
All
All
GMC
Yukon
2025 - 2026
All
All
All
All
Copyright 2026 General Motors
. All Rights Reserved.
Page 2
August, 2026
Bulletin No.: PIT6512A
Involved Region or Country
North America
Condition
Some customers may comment on having the Service Engine Soon (SES) and/or
Malfunction Indicator Lamp (MIL) illuminated on the Driver Information Center (DIC) and
the technician may find SDGM DTC P0604 and/or P0607 set in the K56 Serial Data
Gateway Module if there was a low voltage event
Cause
Software anomaly in the Serial Data Gateway Module.
Correction
Note: If other DTCs except P0604 and/or P0607 are set in the SDGM, refer to SI diagnostics. If after diagnosis a
SDGM is needed contact PQC for a replacement, provide DTC set by SDGM.
Engineering is working on SW update to address this concern. As a temporary solution, perform the following steps:
Note: If at any point while performing this procedure the concern has been corrected before reaching step 3, DO
NOT proceed further or replace the SDGM since it does not correct the issue. Engineering is actively working on a
software update to address this issue.
1. P0604 and/or P0607 could be set as a Low Voltage condition, and/or dead battery. Ensure the battery is fully
charged before proceeding.
2. If SDGM DTC P0604 and/or P0607 set as current and/or history, Clear the dtcs, then perform a reset to the
SDGM by removing the appropriate fuse to the SDGM for 15 minutes and reinstalling fuse. If SDGM DTC P0604
and/or P0607 does not return, no further action is needed.
3. If after following the above steps, the SDGM DTC P0604 and/or P0607 returns as current, the SDGM will need to
be replaced.
Note: The SDGM is on restriction and requires contacting PQC to authorize a replacement. PQC will require the
completed Worksheet per the instructions below.
Instructions for contacting PQC if a part is needed:
U.S Dealers:
Please contact the Product Quality Center (PQC) by opening a new PQC case via One CRM. In Global Connect,
navigate to the Department tab at the top of the screen. Click the dropdown menu and select "Service". Once this
page loads, locate and launch the "CX Connect" App. Search for the associated Pl/Bulletin number to
download the appropriate PQC Parts Restrictions Worksheet and save a copy to your computer. Fill the form out and
save it on your computer. You can then attach a copy of the completed template to your PQC Case
Canadian Dealers:
If your diagnosis leads to a possible part replacement, please contact the PQC by email at [email protected] or by
calling 1-866-654-7654 to receive the PQC -Parts Restriction
Template. Once it has been filled out, return the completed Parts Restriction Template for review.
Warranty Information
For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following
labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information.
Labor
Operation
Description
Labor Time
5410120
Serial Data Gateway
Module Replacement
Use
Published
Time
2081568*
Serial Data Gateway
Module Fuse reset
.4 Hr.
*This is a unique Labor Operation for Bulletin use only.
Bulletin No.: PIT6512A
August, 2026
Version
2
Modified
05/11/2026 - Created.
08/03/2026 - Updated Model list
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.
Page 3
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TSB/Document ID: PIT6512A
Replacement Service Bulletin Number:
MFR Communication Date: 2026-08-03
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: UNKNOWN OR OTHER
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