NHTSA ID Number: 11032774
Manufacturer Communication Number: PIT6476B
TSB/Document Date: 2026-05-19
Summary
This preliminary information communicates an issue with a Service Brake system message and DTC C055F due to a low battery condition. Dealer are to inspect the battery, battery connections and for any aftermarket devices.
Bulletin No.: PIT6476B
Service Bulletin
Date: May, 2026
PRELIMINARY INFORMATION
Subject:
Brand:
Service Brake System / DTC C055F or C0597
Model:
Model Year:
from
VIN:
to
from
to
Escalade
2022-2026
All
All
All
All
Escalade
ESV
2022-2026
All
All
All
All
Silverado
2022
1500 (RPO
J22, VIN Digit
5 = A or D)
All
All
All
All
Silverado
1500
2023-2026
All
All
All
All
Sierra 1500
(RPO J22,
VIN Digit 5 =
H or U)
2022
All
All
All
All
Sierra 1500
2023-2026
All
All
All
All
Yukon
2022-2026
All
All
All
All
Yukon XL
2022-2026
All
All
All
All
Involved Region or Country
North America
Condition
Some customers may comment on any of the following conditions: ABS MIL, SES MIL,
Service Brake System message, Service StabiliTrak, or a change in the brake pedal
effort. When checking for DTCs a C055F will be set in the K160 BSCM .
Note: For the 2026 Full Size SUVs (Escalade, Tahoe, Suburban, Yukon models) the DTC
has changed from a C055F to a C0597 so just those models will instead set a C0597.
Cause
This condition could be caused by a low voltage condition.
Correction
If after following normal SI diagnostics and a root cause is not found, then perform the following inspections:
1. Inspect the battery, battery cables, Engine harness junction/fuse block (X50A) and battery fuse block (X50B)
connections to make sure they are all clean and tight.
2. Inspect the K160 BSCM's power and ground terminals for poor tension, crimps or backing out. Also, inspect the
actually ground and fuse connections for any loose or corroded connections.
3. Inspect the charging system for proper operation.
4. Inspect for any type of aftermarket equipment that could draw down the battery (dash cameras, cell phone
chargers, etc.).
5. Inspect for any parasitic draws on the battery by performing a Battery Electrical Drain/Parasitic Load Test.
6. If applicable, perform bulletin 24-NA-039 Dead Battery and / or Unwanted Liftgate Opening (Reprogram K9
BCM).
Copyright 2026 General Motors
. All Rights Reserved.
Page 2
May, 2026
Bulletin No.: PIT6476B
7. Test the battery using the DCA and charge or replace as necessary.
Note: Testing the battery at the ambient temperatures the issue occurs could help identify any battery related issues.
8. For 2026 Silverado/ Sierra Trucks Only - Reprogram the K160 BSCM with updated cals currently available in TLC/
SPS.
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
2480478*
To Perform testing on
Battery / Charging /
Parasitic Draw / and
Connection inspections.
1.0 Hrs.
Add
ONLY Use For 2026
Silverado/Sierra to
Reprogram the K160
BSCM
0.3 Hrs.
*This is a unique Labor Operation for Bulletin use only.
Version
3
Modified
01/26/2026 Created on
03/24/2026 Update to the Title, Condition, Cause and Correction
05/14/2026 Update to the Correction and Warranty sections.
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.
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TSB/Document ID: PIT6476B
Replacement Service Bulletin Number:
MFR Communication Date: 2026-05-14
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: UNKNOWN OR OTHER
MFR Component System:
MFR Component Subsystem:
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