Bulletin No.: PIP5358C
Published date: 07/18/2023

Preliminary Information
PIP5358C Vehicle Noise Diagnosis and TAC Requests For
Assistance With Noise Related Complaints
Models
Brand:
All

Model:
All

Model Years:
2000 - 2024

VIN:
from
All

Engine:

to
All

All

Transmissions:
All

Supersession Statement
This PI was superseded to update model years and models. Please discard PIP5358A
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition / Concern
When working with a vehicle that has an unusual noise and is di cult to identify, isolate or pinpoint, we would
request that prior to dis-assembly for this concern you get a sound/video le of the noise prior to calling Technical
Assistance.
To accomplish this you can use a cell phone to record audio or video with sound to send to TAC or the process
below will show how to use the PICOSCOPE as a microphone and that le can be sent in. This is a much higher
quality recording.
If you need to download or update the PicoScope, follow the steps below:
1) Log into GM GlobalConnect.
2) Click on the "Departments" drop down menu and select "Service.”
3) Under "Applications" on the service page, select "Special Tools and Software updates.”
4) You will now be re-directed to www.gmtoolsandequipment.com (do not access this site directly as it requires
the use of GlobalConnect to allow downloads).
5) Click the link under "Software Downloads" for the latest PicoScope software version and a new page will open.
6) Click the setup links and follow instructions to update the tool.
1) Place the PicoScope accelerometer sensor nearest to where the noise appears to be coming from.
Moving the sensor and getting another recording may help to isolate the area better.
Note: Ensure to keep the cable routed away from the exhaust if working in the engine compartment or moving
parts if working under the vehicle.
2) Open the most current version of GM NVH.
3) After completing the wizard, go back into the setup tab under Vibration Signal and select Single Channel.
Select TA148 Interface in the “Box” dropdown and TA144 Microphone for the “Sensor” Drop down. (You will still
use the accelerometer as your microphone)
Select the Location as current location being inspected.

Note: If using 3 axis, use center channel only and set up as single axis.
4) Operate the vehicle to verify condition and record a Pico data le of the concern.
NOTE: Review the le, it will play back an audio le that can be heard from the PC speakers.
PICO will pick up normal noises and make them clearly audible.
Make sure the noise that we are trying to diagnose is on the le.
If the noise is not there, move the sensor and record another le until you nd the source area.

5) While the reviewed le is on the screen, click File Save. It should be formatted as .pddata
6) The next box allows you to save the vehicle information as well as customer information and notes in the Notes
box. This could be sensor location, sensor direction and even road surface name, etc. Click Ok when you are done
adding information.
7) 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.
Or using the latest version of PIP5632 in the U.S. you can put the recording directly into the case.
Note: For Middle East, Japan or other countries, contact your local TAC for submission instructions.

Recommendations / Instructions
In an attempt to better assist dealers and get vehicles returned to customers repaired right the rst time, GM TAC
will request any calls regarding assistance for unidenti ed or non-isolated noise complaints to have a
sound/video le ready to send in for assessment by engineering.
At times TAC will request the aid of engineers to help locate or isolate a noise and it may be something they have
heard before. The sound le or video may assist with this if the noise can be captured.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is
resolved without completing every step, the remaining steps do not need to be performed.

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