NHTSA ID Number: 11027597
Manufacturer Communication Number: PIT6459A
TSB/Document Date: 2026-01-13
Summary
This PI communicates an issue where the Brake System Control Module DTC: U0028-88 and U0037-88 diagnostics are backwards and follow the diagnostic procedure for U0037 if U0028 is set and vice versa.
Bulletin No.: PIT6459A
Service Bulletin
Date: January, 2026
PRELIMINARY INFORMATION
Subject:
Brand:
DTC U0028 or U0037 Set In The K160 Brake System Control Module
Model:
Model Year:
from
VIN:
to
from
Engine:
to
Escalade
2026
ALL
ALL
ALL
ALL
Escalade
ESV
2026
ALL
ALL
ALL
ALL
Silverado EV
2026
ALL
ALL
ALL
ALL
Suburban
2026
ALL
ALL
ALL
ALL
Tahoe
2026
ALL
ALL
ALL
ALL
Sierra EV
2026
ALL
ALL
ALL
ALL
Yukon
2026
ALL
ALL
ALL
ALL
Yukon XL
2026
ALL
ALL
ALL
ALL
Involved Region or Country
North America
Condition
Some technicians may encounter a DTC: U0028 symptom 88 and/or U0037 symptom 88
set in the K160 Brake System Control Module.
Cause
If a technician encounters DTC U0028 sym88 and/or U0037 sym88 during diagnostic
testing, these codes may report to the incorrect diagnostic path due to a software
anomaly within the K160 Brake System Control Module.
Correction
A SW update is planned to be released for the ICE (internal combustion engine) SUVs for this issue in Q1 of 2026.
A SW update is planned to be released for the Silverado/Sierra EV's starting in model year 2027.
In the interim, if a technician encounters either U0028-88 or U0037-88 during diagnostic testing, they should utilize
the opposite DTC diagnostic procedure in SI.
If the vehicle has U0028-88 then use the diagnostic for U0037-88.
If the vehicle has U0037-88 then use the diagnostic for U0028-88.
This PI will be updated once the SW has been released into SPS.
Version
2
Modified
11/25/2025- Created On.
01/05/2026 - Updated correction field for software update
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
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technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
TECHNICIAN
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job
CERTIFICATION
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
Copyright 2026 General Motors
. All Rights Reserved.
information.
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TSB/Document ID: PIT6459A
Replacement Service Bulletin Number:
MFR Communication Date: 2026-01-05
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: UNKNOWN OR OTHER
MFR Component System:
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