22-NA-248

Bulletin No.:
Service Bulletin
Date:
22-NA-248
January, 2023
TECHNICAL
Subject:
HVAC Heat Intermittently Inoperative, DTCs B2B05 and/or B2B06 Set
Brand:
Model:
Cadillac
Escalade Models
Chevrolet
GMC
Model Year:
from
to
Suburban
Tahoe
2021
2022
Yukon Models
Breakpoints:
from
to
(2021 MY)
1GNSCNKD3MR355234 to
1GNSKDKD4MR494401
(2022 MY)
1GNSKFKL8NR100001 to
1GKS2BKD8NR170158
Engine:
Transmission:
All
—
Involved Region or Country
North America
Condition
Some customers may comment on the HVAC heat intermittently inoperative.
Technicians may find one or both of the following DTCs set in the BCM.
• B2B05 - HVAC Temp Motor - Front 1 Performance
• B2B06 - HVAC Temp Motor - Front 2 Performance
Cause
The condition may be caused by a mismatch of B020 firmware and B018 parameters.
Copyright 2023 General Motors LLC. All Rights Reserved.
Page 2
January, 2023
Bulletin No.: 22-NA-248
6213239
Correction
6213261
Visually inspect the right side temperature valve actuator (1) and the left side temperature
valve actuator (2) for a yellow dot, as shown in the pictures above, that indicates the parts
were manually re-flashed. If the yellow dot is present, replace the temperature valve
actuator.
Bulletin No.: 22-NA-248
January, 2023
Page 3
Service Procedure
Important: Service agents must comply with all
International, Federal, State, Provincial, and/or
Local laws applicable to the activities it performs
under this bulletin, including but not limited to
handling, deploying, preparing, classifying,
packaging, marking, labeling, and shipping
dangerous goods. In the event of a conflict between
the procedures set forth in this bulletin and the
laws that apply to your dealership, you must follow
those applicable laws.
Refer to Temperature Valve Actuator Replacement
in SI.
Parts Information
Using the VIN#, refer to the electronic parts catalog
(EPC) for obtaining the correct temperature valve
actuator P/N#.
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
4420810
Temperature Valve Actuator Replacement - Right Side
4420820
Temperature Valve Actuator Replacement - Left Side
Use Published Labor
Operation Time
Version
1
Modified
Released January 19, 2023
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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