NHTSA ID Number: 11010901
Manufacturer Communication Number: 24-NA-229
TSB/Document Date: 2024-12-02
Summary
This bulletin provides a procedure on how to check for a battery drain utilizing the Picoscope and how to measure the load on the system that may be causing a drain.
Bulletin No.: 24-NA-229
Service Bulletin
Date: October, 2024
INFORMATION
Subject:
Brand:
Information on Use of Picoscope and PicoLog for Battery Draw Monitoring/
Intermittent Dead Battery
Model:
Model Year:
from
Enclave
Encore
Buick
Encore GX
2025
2020
Envision
Envista
2024
2025
CT5
CT6
Escalade Models
2022
2025
CT4
to
2020
2020
XT4
2025
XT5
XT6
Blazer
2020
2025
Camaro
2020
2024
Colorado
2020
2025
Corvette
2020
2025
Equinox
2020
2025
Express
2020
2025
Silverado 1500
2020
2021
Chevrolet Silverado
1500 - New (RPO
J22, VIN Digit 5 =
A/D)
2022
2022
Silverado 1500
2023
2025
2020
2025
Silverado 1500 LTD
(RPO J21, VIN Digit
5 = W/Y)
Silverado 2500HD/
3500HD
Suburban
Tahoe
Traverse
GMC
Acadia
2020
Canyon
2020
Copyright 2024 General Motors. All Rights Reserved.
2025
Build Date:
from
Engine:
to
Page 2
Brand:
October, 2024
Model:
Bulletin No.: 24-NA-229
Model Year:
from
to
2022
Savanna
2020
Sierra 1500
2020
2021
2022
2022
Sierra 1500 Limited (RPO J21,
VIN Digit 5 = 8/9)
Sierra 1500 - New
(RPO J22, VIN Digit
5 = H/U)
Sierra 1500
2023
Sierra 2500HD/
3500HD
2020
Build Date:
from
Engine:
to
2025
Yukon Models
Involved Region or Country
North America
Condition
Some customers may comment on an intermittently dead battery.
Cause
This condition may be caused by wiring shorts, opens, or malfunctioning components that
may wake-up the module and intermittently drain the battery.
- These types of conditions can be difficult to diagnose, and this procedure allows a
technician to leave a computer hooked up to monitor for random draws over longer period of time to isolate these random events.
Use Picoscope and the PicoLog application to help identify and isolate intermittent draws.
Correction
6746220
Attached is diagram that shows how to properly assemble a "shunt resistor" that will be
used to monitor current draw using voltage drop across a known resistance of 0.1 Ohms.
• 2 Banana plug terminals
• 1 Mini Fuse Holder
• 1 20A Mini Fuse
• 1 Resistor (0.1 Ohm)
- Tech will be required to construct a shunt using a resistor. These resistors are widely
available from many sources.
- The resistor should be a 0.1 Ohm resistor between 50 and 100watt capacity.
Bulletin No.: 24-NA-229
October, 2024
Page 3
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.
Picoscope Set-Up
Important: For additional information, refer to https://www.picotech.com/library/knowledge-bases/data-loggers/
picolog-6-data-logging-software#:~:text=PicoLog%206%20data%20logging%20software%201%20Realtime%20data,Up%20to%204%20independent%20graph%20axes%20More%20items.
Channel “A” will be set up to monitor battery voltage.
6746195
Channel “B” will be set up using an equation as shown, to measure voltage drop across a known resistance to
accurately measure current draw using a shunt resistor.
Channel “C” is an amp clamp that can be moved around the vehicle to narrow down where the current draw is originating from.
Picoscope Connection
Caution: Do not attempt to turn the vehicle “on” or start the vehicle with the shunt in place. The shunt resistor will be
damaged, and the fuse will open if the vehicle is turned on with the resistor in place.
Page 4
October, 2024
Bulletin No.: 24-NA-229
6749605
Assemble the shunt resistor as shown in the shunt diagram. Banana plugs will be plugged into banana alligator clips
and this shunt resistor will be connected between the battery and the negative lead on the vehicle. The negative lead
from channel “B” (2) will be connected to the negative post on the battery (1) which is connected to the shunt
resistor. The positive lead, from channel “B” will be connected to the negative cable (4) which is connected to the
other end of the shunt resistor (3).
Bulletin No.: 24-NA-229
October, 2024
Page 5
6749737
The amp clamp on channel “C” can be placed on the power wiring for any suspect module or component on the
vehicle as the technician sees fit. This will allow us to target suspect circuits. This amp clamp may not provide
accurate draw input if the amperage draw is particularly low, but it will show draw in a suspect circuit, which will
confirm the draw seen at the shunt to target the suspect module, component, or wiring.
Channel “D” can be configured as an additional amp clamp or other device as needed.
Page 6
October, 2024
Bulletin No.: 24-NA-229
6749765
The use of PicoLog software will allow a dedicated computer to monitor current draw on a vehicle for an extended
period which allows us to capture draws that occur very infrequently.
Version
1
Modified
Released October 17, 2024
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: 24-NA-229
Replacement Service Bulletin Number:
MFR Communication Date: 2024-10-17
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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