NHTSA ID Number: 11002020
Manufacturer Communication Number: 23-NA-149
TSB/Document Date: 2024-06-24
Summary
This technical bulletin provides a procedure to correct the condition of Trailer Brake Disabled and/or DTC C1114 Stored During Pulling a Trailer with a Battery, Generator or Solar Charger.
Bulletin No.: 23-NA-149
Service Bulletin
Date: June, 2024
TECHNICAL
Subject:
Brand:
Check Trailer Wiring Message Displayed, Trailer Brake Disabled, and/or
DTC C1114 Stored when Pulling Trailer with a Battery Generator or Solar
Charger
Model:
Model Year:
from
to
Escalade Models
2023
2023
Silverado 2500HD/
3500HD
2024
2024
Silverado EV
2024
2024
Colorado
2023
2023
Silverado 4500/5500
2023
2023
Suburban
2023
2023
Tahoe
2023
2023
Sierra 2500HD/
3500HD
2024
2024
2024
2024
2024
2024
Canyon
2023
2023
Yukon Models
2023
2023
Vehicles Production Build
Date:
from
to
SOP
January 21,
2024
All
All
Involved Region or Country
North America, Middle East, Israel
Condition
Some customers may comment on a check trailer wiring message displayed, trailer brake
disabled when pulling trailer with a battery generator or solar charger.
During Diagnosis a technician may find DTC C1114 set/stored.
Cause
The issue may be caused by the solar panel battery charger or generator on the customer's trailer. If the trailer battery becomes fully charged and has a higher charge then the
vehicle battery, it can back feed into the trailer brake power module and cause it to shut
down.
Additional information for some ICE vehicles and EVs:
• For ICE (internal combustion engine) vehicles - During vehicle start up or stop/start
event
• For EV's (electric vehicles) – When vehicle placed in propulsion (PROP)
If the trailer battery has a higher state of charge than the vehicle battery, it can also cause
this condition until the vehicle's charging system brings the vehicle battery up to a higher
state of charge. The message should go away and the trailer brakes will work as normal.
Correction
Copyright 2024 General Motors
. All Rights Reserved.
Replace the trailer brake module with updated part.
Page 2
June, 2024
Service Procedure
Bulletin No.: 23-NA-149
Parts Information
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.
If you encounter a vehicle with the above concern,
replace the trailer brake module. Refer to Trailer Brake
Control Module Replacement in Si.
Causal
Part
Description
Part Number
Vehicles
X
Trailer Brake
Control Module
23306694
Silverado
HD/Sierra
HD
Colorado/
Canyon
HUMMER
EV
Silverado EV
84857588
Suburban
Tahoe
Escalade
Yukon
23337305
4500/5500
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation
Description
Labor Time
2210300
Trailer Brake Control Module Replacement
Use Published Labor Operation Time
Version
4
Modified
Released September 01, 2023
Revised September 15, 2023 – Added Suburban, Tahoe, Yukon, Escalade Models and
Part #.
Revised February 15, 2024 – Updated Subject and Condition.
Revised June 07– Added Production Vehicle Build Date Breakpoint.
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: 23-NA-149
Replacement Service Bulletin Number:
MFR Communication Date: 2024-06-07
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
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