NHTSA ID Number: 10242125
Manufacturer Communication Number: 23-NA-102
TSB/Document Date: 2023-09-09
Summary
This service bulletin provides a procedure to repair wiring to correct customer concerns of Driveability, Hesitation, Transmission Shifting Rough/Harsh, Malfunction Indicator Lamp (MIL) Illuminated.
Bulletin No.:
Service Bulletin
Date:
23-NA-102
August, 2023
TECHNICAL
Subject:
Drivability Concerns, Hesitation, Transmission Shifting Rough/Harsh, Malfunction
Indicator Lamp (MIL) Illuminated - Multiple DTCs Set
Brand:
Model:
Model Year:
Escalade
2023
2023
LM2
Silverado 1500 New (RPO J22,
VIN Digit 5 = A/D)
2022
2022
LM2
2024
LZ0
Silverado 1500
2023
Tahoe
Sierra 1500 - New
(RPO J22, VIN
Digit 5 = H/U)
Sierra 1500
Yukon Models
Involved Region or Country
Copyright 2023 General Motors
LLC. All Rights Reserved.
2023
2023
2022
2023
from
SOP
to
to
Suburban
Breakpoint Date:
from
JUNE
1, 2023
Transmission:
LM2
LM2
2022
LM2
2024
LZ0
2023
LM2
North America, Europe, Kazakhstan, Uzbekistan, Russia, Middle East, Iraq, Israel,
Palestine, Argentina (Mercosur), Brazil (Mercosur), Bolivia (West), Chile (West),
Colombia (West), Ecuador (West), Paraguay (West), Peru (West), Uruguay (West),
Venezuela (West), Other Central America, Japan, Cadillac Korea (South Korea), GM
Korea Company, China - SGM, Taiwan , Thailand (ASEAN), Singapore, Philippines,
Australia/New Zealand, Caribbean, Egypt, Other Africa, South Africa
Page 2
August, 2023
Bulletin No.: 23-NA-102
Some customers may comment on one or more of the following conditions:
1. Drivability concerns (engine performance)
2. Hesitation
3. Transmission shifting rough/harsh
4. MIL illuminated
Some technicians may find one or more of the following DTCs set:
Note: Additional DTCs may have been set. It was found that these were the most
common.
Condition
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
P1005
P31C3
P0700
U0073
U0074
P25A2
U1600
U0633
U0623
U02A9
U0285
U0284
P10C6
P2269
U0074
U0131
U029D
U029E
U059F
U18A2
Cause
This condition may be caused by one or more of the following:
• CAC pump electrical connector
• Active grill shutter electrical connector
• Engine wiring harness contacting the alternator bracket
• Loose ground at the front of the engine
Correction
Repair the wiring using SI procedures. Refer to Wire to Wire Repair in the Service Manual
or Ground Repair in the Service Manual.
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.
Service Procedure
Note: Using Woven Polyester Electrical Tape (PET),
tape all the contact points of the wiring harness
ensuring that the tape is applied in a double layer
extending along the harness past the splice sleeves.
Verify all straps are secured and retainers are installed.
Bulletin No.: 23-NA-102
August, 2023
Page 3
Information
Area of Concern at the CAC Pump Electrical
Connector
6219342
An open cavity or an unsealed pump connector
allowing water into the (M10) charge air cooler pump
electrical connector might be the root cause of the
communication failure.
– Check the CAC Pump connector sealing and look for
any corrosion at the pump due to water leakage.
DTCs that may be common with water intrusion the
electrical connector:
Note: U02A9 might be set with or without U1345 (LIN
BUS1 Failure).
•
•
•
•
•
•
•
•
•
Area of Concern Active Grille Air Shutter
Actuator In-line Connector
The following DTCs may be caused by the engine
wiring harness to active grille air shutter actuator in-line
connector (X618 on the pickup and X604A 0n the
SUV). Please check circuit 4621 which may be:
• Not properly connected
• Not properly held by the rear clip
• Grounded on the radiator
P0700 Transmission Control Module Requested
Malfunction Indicator Lamp Illumination
P25A2 Brake System Control Module Requested
Malfunction Indicator Lamp Illumination
U0284 Lost Communication with Active Grille Air
Shutter Actuator 1
U0285 Lost Communication with Active Grille Air
Shutter Actuator 2
U02A9 Lost Communication with Charge Air
Cooler Coolant Pump
U0623 Lost Communication with Heater
Coolant Pump
U0633 Lost Communication with Engine Cooling
Fan 2
U1345 Engine Control Module LIN Bus 1
U1600 Lost Communication with Transmission
Control Module on Engine Control Module LIN
Bus 1
6219339
Page 4
August, 2023
The graphic above shows how the proper connection
must be.
– Check the active grille air shutter actuator in-line
connector for not being properly connected or
grounded to the radiator.
DTCs may be caused by the active grill air shutter
wiring pinched at the radiator support.
6219340
The graphic above depicts where a pinching condition
may be located.
– Check the active grill air shutter wiring route to
identify possible damaged points in the wiring.
DTCs that may be common with the wiring harness
contacting the radiator or an improper connection:
• P0700 Transmission Control Module Requested
Malfunction Indicator Lamp Illumination
• P25A2 Brake System Control Module Requested
Malfunction Indicator Lamp Illumination
• U0284 Lost Communication with Active Grille Air
Shutter Actuator 1
• U0285 Lost Communication with Active Grille Air
Shutter Actuator 2
• U02A9 Lost Communication with Charge Air
Cooler Coolant Pump
• U0623 Lost Communication with Heater
Coolant Pump
• U0632 Lost Communication with Cooling Fan
Motor
• U0633 Lost Communication with Engine Cooling
Fan 2
• U1345 Engine Control Module LIN Bus 1
• U1600 Lost Communication with Transmission
Control Module on Engine Control Module LIN
Bus 1
Bulletin No.: 23-NA-102
Bulletin No.: 23-NA-102
August, 2023
Page 5
LM2 Area of Concern at Alternator Bracket
6357536
– Arrows indicate location of retainer pins that were not
properly installed.
– Blue circle indicates where a chafe in the wiring has
occurred. The mis-installed bracket allowed the
harness to lay on the alternator.
6357529
Page 6
August, 2023
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TSB/Document ID: 23-NA-102
Replacement Service Bulletin Number:
MFR Communication Date: 2023-08-08
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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