NHTSA ID Number: 11013269
Manufacturer Communication Number: 24-NA-239
TSB/Document Date: 2025-01-30
Summary
This informational bulletin provides a guide on how to diagnose and test for vibrations utilizing the PicoScope.
Bulletin No.: 24-NA-239
Service Bulletin
Date: January, 2025
INFORMATION
Subject:
Brand:
Information on Use of PicoScope for Noise Isolation and Diagnosis
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
2025
Camaro
2024
Colorado
Equinox
2020
2025
Express
Silverado 1500
2021
Silverado 1500 LTD
(RPO J21, VIN Digit
5 = W/Y)
Chevrolet Silverado
1500 - New (RPO
J22, VIN Digit 5 =
A/D)
2022
2022
Silverado 1500
2023
2025
2020
2025
Silverado 2500HD/
3500HD
Suburban
Tahoe
Traverse
Acadia
GMC
Canyon
Savanna
Sierra 1500
Copyright 2025 General Motors. All Rights Reserved.
2020
2025
2021
Build Date:
from
Engine:
to
Page 2
Brand:
January, 2025
Model:
Sierra 1500 Limited (RPO J21,
VIN Digit 5 = 8/9)
Sierra 1500 - New
(RPO J22, VIN Digit
5 = H/U)
Sierra 1500
Model Year:
from
to
2022
2022
Build Date:
from
Engine:
to
2023
Sierra 2500HD/
3500HD
Terrain
Bulletin No.: 24-NA-239
2020
2025
Yukon Models
Involved Region or Country
North America, Israel, Argentina (Mercosur), Brazil (Mercosur), Bolivia (West), Chile
(West), Colombia (West), Ecuador (West), Paraguay (West), Peru (West), Uruguay
(West), Venezuela (West), Japan, Middle East
Condition
Some customers may comment on noise from vehicle.
Information
Some vehicle noises are difficult to pinpoint or locate, the PicoScope can be used to help
narrow down the sources of noise.
Use the PicoScope to help isolate noises using the accelerometer as a microphone for
structure-borne noise and the use of the microphone for airborne noise.
Demonstrate to the dealer how to diagnose noises using the PicoScope accelerometer
configured as a microphone. This device will pick up almost any structure-borne noise or
vibration and will allow it to be closely analyzed in a recording. The PowerPoint shows
the process where we set up the PicoScope for noise recording rather than vibration
using an accelerometer as a microphone for structure-borne noise. When we are trying to
isolate airborne noise, we will be using the Pico TA144 microphone and using the same
setup procedure. The document attached also has guidelines for when and how to record
sounds using a smartphone for review by Engineering and gives tips to get a higherquality recording.
Correction
Use PicoScope and the PicoLog application to help identify and isolate intermittent
draws.
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.
Determine where the noise/vibration is coming from.
1. Get in the driver’s seat and start the vehicle.
2. Determine if the complaint can be heard or felt from inside the vehicle. If not, determine if it can be heard or felt
from under the hood.
• Heard from driver’s seat: Take a phone/audio recording from the driver’s seat, along with engine speed
(RPM), and vehicle speed. Send the recording to the assigned TAC representative or FSE.
• Felt through steering wheel or seat: Proceed with using a PicoScope accelerometer to collect data. AS AN
ACCEL NOT A MIC (used on seat track).
• Heard from under the hood or outside the vehicle: Take a phone/audio recording where the noise is the
loudest.
Note: If accelerometer is setup as a microphone, only channel B on PicoScope will be actively collecting data.
• Felt under the hood: Proceed with using a PicoScope accelerometer to collect data. AS A MIC.
Bulletin No.: 24-NA-239
January, 2025
Page 3
Note: For best results using cell phone video/audio recordings, please refer to helpful guidelines outlined and the
end of the guide or click HERE to be taken directly there.
Verify and if needed download the latest PicoScope NVH software.
• Type in “GM Tools and Equipment” into your web browser and go to the respective website link.
• Click on “Software Downloads” and scroll to the PicoScope NV Tool section.
• If a download is required, click on the latest software update link, and follow the onscreen instructions to
download the software
6751724
Note: Two versions of PicoScope will download automatically; GM NVH will be most commonly used.
• (1) GM NVH
• (2) PicoScope for GM
Page 4
January, 2025
Bulletin No.: 24-NA-239
6751737
Set-Up for Vibration and/or Microphone Pico Readings
1. Accelerometer Setup:
• Screw the accelerometer connector into the sensor interface. The red LED will start to blink when it senses
the connection. If the sensor interface doesn’t show a red light, the 3V battery in it may need to be replaced.
− If you are using a tri-axis, three output accelerometer, attach a blue, red, and green BNC cable to X, Y, and
Z ports respectively. Then attach the blue, red, and green cables to channels A, B, and C on the backside of
the PicoScope.
− If you are using a single axis, single output, accelerometer attach the output to the X port using any colored
cable.
• Common Locations for Accelerometers:
− Interior- Drivers Front Outboard Seat Track Bolt (Large Hex)
− Engine- Valve/Cam Cover Bolt, Oil Pan Bolt, Engine Block (Iron Block), Main Bearing Cross Bolt
− Transmission- Transmission Mount Bolt, Transmission Bellhousing Bolt (Lower)
2. Microphone Setup:
• Screw the microphone into the female end of the sensor extension cable and the male end into the NVH
interface box. The red LED on the sensor interface box will start to blink when it senses the connection. If the
sensor interface doesn’t show a red light, the 3V battery in it may need to be replaced.
− Connect the single axis NVH interface box to channel “B” on the PicoScope using any colored BNC cable.
• Common Locations for Microphone:
− Interior- Pico TA144 Microphone not recommended for interior sound measurements.
− Engine- 0.5m or more away from noise source on engine, same relative location as ear.
− Transmission- 0.5m away from bellhousing/exhaust (if stationary)
Bulletin No.: 24-NA-239
January, 2025
Page 5
6751786
• 1) Tri-Axis Accelerometer (TA-143)
• 2) Microphone (TA-144)
• 3) Single Axis Accelerometer (TA-183)
Software Setup
1. Setup the software to collect data:
• Plug the PicoScope USB cable into the computer that’s going to be used for recording.
• Open the GM NVH software and click on the NVH button.
• Start a new test with the setup wizard and follow steps.
• For Using Vehicle CAN Data (Engine and Vehicle Speed).
− Key on vehicle and connect either an MDI or J2534 (Mongoose) to the vehicle’s OBD-II port.
− Attach the MDI or a J2534 USB cable into the second USB port on the computer and wait for PicoScope to
recognize/connect to vehicle. Vehicle VIN will appear once connected.
Note: If using a J2534 interface you may have a window open with a red “X” through a picture of a blue MDI box. Hit
“Cancel” and continue to wait for the driver to connect. It may take several minutes to connect to the vehicle.
• For Static/Stationary Testing Only (idle speed), the static rpm option can be used.
− Continue through the setup wizard and configure the vehicle appropriately.
− Select the interface that was plugged in and then the correct sensor type. Make sure the accelerometer
and/or microphone is setup as the correct model and note location.
• Go to the setup screen to finalize the wizard setup:
Note: For vibration, the device J2534 interface is required, so it must be set up and working before continuing to the
Tri-Axis Accelerometer Setup section.
Page 6
January, 2025
Bulletin No.: 24-NA-239
6754978
1. Select the Options tab.
2. Select the Enable Advanced Features box.
Bulletin No.: 24-NA-239
January, 2025
Page 7
6751935
Tri-Axis Accelerometer Setup:
1. Verify that the RPM signal is displaying the correct value.
2. Verify the mode is set to 3-axis.
3. Verify that all the channels are selected
4. Verify that the location is set to where the accelerometer was placed:
• If it is in the vehicle, set as passenger compartment.
• If it is under the hood, set as engine compartment.
5. Set the signal history to 250 seconds (Default is 50 seconds).
Page 8
January, 2025
Bulletin No.: 24-NA-239
6751936
Single-Axis Accelerometer Setup:
1. Verify that the RPM signal is displaying the correct value.
2. Verify that the mode is set to Single channel.
3. Change the orientation to match the placement of the accelerometer if needed.
4. Verify that the location is set to where the accelerometer was placed:
• If it is in the vehicle, set as passenger compartment.
• If it is under the hood, set as engine compartment.
Signal Quality Check:
• The Vibration Signal on the Setup tab includes a Signal Quality bar. The green signal quality bar is a visual
indication the software is receiving a signal from the accelerometer. Verify the accelerometer has a response by
tapping on (or next to) the accelerometer, the green bar should move respectively.
Bulletin No.: 24-NA-239
January, 2025
Page 9
6751937
Microphone Setup:
1. Verify that the RPM signal is displaying the correct value.
2. Verify that the mode is set to Single channel.
3. Check that the location is set to where the microphone was placed.
4. Set the signal history to 250 seconds (Default is 50 seconds).
Signal Quality Check:
• The Microphone Signal on the Setup tab includes a Signal Quality bar. The green signal quality bar is a visual
indication the software is receiving a signal from the microphone. Verify the microphone has a response by
speaking into or clapping next to the microphone, the green bar should move respectively.
Note: After completing the set-up wizard, it will redirect to the Record and Analyze tab. In the middle right of the
Record and Analyze tab, there will be a Details button. Clicking on the Details button will bring up a new window
where notes can be recorded. Enter specific details regarding accelerometer/microphone location along with any
other important details regarding the test set-up.
Page 10
January, 2025
Bulletin No.: 24-NA-239
Recording Data:
• Verify noise/vibration can be reproduce before recording.
• To Start recording, click on the Start Recording button in the lower left of the Record and Analyze Tab.
• Once finished testing, click on the Stop Recording button in the lower left of the Record and Analyze Tab.
Note: To reset current capture and clear any previously unsaved recorded data, click on the Reset Current Capture
arrow that’s to the right of the recording button.
• After finishing the recording, click file and select save. Click OK on the details box as this input is optional and
save as a .pddata.
• Create an e-mail to [email protected] in the U.S. and [email protected] in Canada
and in the subject line Put Vibration, your BAC, and last 8 of the VIN.
Helpful Guidelines for Audio/Video Recordings
Note: The Following Applies to Smart Phones Only.
Important Notes:
• Microphones are typically located at the bottom of the phone, where you speak, and by the cameras. It’s
important to try and keep the microphones free and clear of any obstructions such as fingers/hands while
making the recording(s).
• Unless specified that noise is only heard with windows down only, ensure windows are rolled up, HVAC blower
is off along with radio volume turned down to zero or off completely.
• For Audio Recordings, make note of location of phone and speed of engine at time of recording.
• For Video Recordings, capture engine speed, vehicle speed along, and current gear (if possible).
Maximizing Sound Quality for Audio Recordings (Settings):
• Android Users: Recommend downloading Wav.Editor in the Google Play Store since default phone audio
settings vary by phone manufacture (.WAV is ideal).
• Apple/iOS Users: Go to Settings > Voice Memos > Audio Quality > Select Lossless.
Maximizing Sound Quality for Video Recordings (Settings):
• Android Users: Default newer phones will record video in high quality .MP4 format. Some older model phones
that predate 5G phones (3G and 4G) may have default to lower quality compressed video format (.3GP). Verify
video settings are correct first open camera app > switch to video mode > tap on recording settings > video size/
resolution > Full HD (1920x1080).
• Apple/iOS Users: By default, videos recorded by iPhones are high quality .MOV format (H.264).
Version
2
Modified
Released October 28, 2024
Revised January 16, 2025 - Removed Corvette from Models section and added Middle
East.
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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