NHTSA ID Number: 11029962
Manufacturer Communication Number: PIT6393J
TSB/Document Date: 2026-03-11
Summary
This Preliminary Information is to inform customers to follow diagnostics if resetting, disconnecting the module did not correct it.
Additional Options (RPO)
IVD or IVE
Condition
A customer may comment they are having issues with their infotainment system. This
may include any of the symptoms described below.
Cause
Concerns may be software, connection, or hardware.
Correction
Step 1: For a blank or black cluster and radio display only, refer to SI diagnostics.
For a blank/black radio display only, refer to PIC6540 and perform a reset on the radio to see if display returns. If the
display returns continue to step 2. If display does not return, follow normal SI diagnostics. If SI diagnostics lead you
to replacing the radio or customer complaint is not related to blank or black screens, proceed to step 2.
Step 2: Check for DTCs in or related to the radio. If a DTC is set refer to SI diagnostics. If SI diagnostics instruct you
to replace the radio go to step 3.
Note: If the following DTC’s are set B1A1F.00, B1A1B.00, U1516 and U164E and the vehicle can get the software
listed in 25-NA-085 or 25-NA-183 please update the radio it should correct the issue, if the vehicle is not currently
listed in software 25-NA-085 or 25-NA-183, please ignore them as they are setting due to a software anomaly. DO
NOT replace the radio for these DTCs.
Note: If the following DTCs are set please ignore them as they are setting due to a software anomaly do not replace
the radio for any of these DTCs:, B1596.86, U0142, U0265, U164B, U1615, U164E
Caution: When performing radio software updates that include a USB file transfer, it is imperative that the USB file
only be used for the vehicle the software was intended for. Attempting to use the USB files on another vehicle will
result in a radio failure that cannot be recovered and potentially not warrantable. To avoid this concern, always
download a new USB file from Techline Connect SPS when performing radio updates.
If No DTCs are set, proceed to step 3.
Step 3: If customer concern is related to one of the symptoms below, verify customers radio is at the latest software
version refer to bulletin in table below.
Caution: When performing radio software updates that include a USB file transfer, it is imperative that the USB file
only be used for the vehicle the software was intended for. Attempting to use the USB files on another vehicle will
result in a radio failure that cannot be recovered and potentially not warrantable. To avoid this concern, always
download a new USB file from Techline Connect SPS whenperforming radio updates
Note: If symptom is related to a phone issue, please also make sure the customers phone is fully up to date.
Note: Please follow published Service Information for A11 Radio Reprogramming procedure. To find the build
number in the radio please go to Settings>>System>>About>>Build Number.
Note: For 25MY-26MY Equinox and Terrain is experiencing a vibration, rattle or boom sound, refer to 24-NA-227.
Note: For 25MY-26MY Sierra EV and Silverado EV for turn signal activated camera operation, refer to 25-NA-085.
Note: For 24MY LYRIQ and having troubles with USB dating 25-NA-371, refer to PIC6635.
- Phone Projection/ Bluetooth/ Connectivity (IE Carplay and Android auto connection issues. While using Carplay,
the Driver Information Center may show Audio Unavailable and the Steering Wheel Controls maybe inoperative for
changing songs.)
Bulletin No.: PIT6393J
March, 2026
Page 3
· Radio display flickering or going blank, but recovers
· Intermittent HUD functionality (if equipped with UV6)
· Audio issue
· Camera display
· Cluster functionality except for blank or black screens
· HVAC controls
Step 4. If concerns continue disconnect, inspect, and reconnect all related connections, clear any codes if any are
set and recheck for concern. If concern is still present, proceed to step 5. If concern is related to a blank or black
cluster display that does not recover, proceed to step 6.
Step 5. If the radio is not fixed with the latest software or reset, please inform the customer that GM is working on
several software improvements aimed at resolving current issues and improving overall functionality. Where
practical, dealers should encourage customers to wait until updated software becomes available and please do not
replace the radio, amplifier, speakers, radio display, Instrument panel display, or the Heads-up display.
Model Year
Brand
Model
Latest Software Bulletin
2024
Bright Drop
Zevo 400/600
24-NA-092
2025
BrightDrop
Zevo 400/600
24-NA-193
2025
Enclave
25-NA-183
2026
Enclave
Latest software
2024 - 2025
Envision
25-NA-183
2026
Envision
Latest software
2025
CT5
25-NA-183
2026
Cadillac
CT5
Latest software
2025
Cadillac
Escalade/Escalade ESV
25-NA-371
2026
Escalade/Escalade ESV
Latest software
2025
Cadillac
Escalade IQ
25-NA-386
2026
Cadillac
Escalade IQ
Latest software
2026
Cadillac
Escalade IQL
Latest software
2023
Cadillac
LYRIQ
24-NA-155
2024 - 2025
LYRIQ
25-NA-371
2026
Cadillac
LYRIQ
Latest software
2025 - 2026
OPTIQ
26-NA-048
2026
Cadillac
VISTIQ
Latest software
2024 - 2025
Cadillac
XT4
25-NA-183
2026
XT4
Latest software
2024
Chevrolet
Blazer EV
24-NA-193
2025
Blazer EV except SS
24-NA-193
2025
Chevrolet
Blazer EV SS Only
Latest software
2026
Corvette
Latest software
2024 - 2025
Chevrolet
Equinox
25-NA-183
2026
Chevrolet
Equinox
Latest software
2024
Chevrolet
Equinox EV
24-NA-193
2025 - 2026
Chevrolet
Equinox EV
25-NA-386
2024 - 2026
Chevrolet
Silverado EV WT/RST
26-NA-048
2025
Chevrolet
Suburban /Tahoe
25-NA-371
Page 4
March, 2026
Bulletin No.: PIT6393J
Model Year
Brand
Model
Latest Software Bulletin
2026
Chevrolet
Suburban/Tahoe
Latest software
2024 - 2025
Acadia/Traverse
25-NA-183
2026
Acadia/Traverse
Latest software
2023
GMC/Chevrolet
Canyon/Colorado
24-NA-155
2024 - 2025
Canyon/Colorado
25-NA-183
2026
25-NA-330
2026
GMC
25-NA-330
2024 - 2026
GMC
Sierra Denali EV
26-NA-048
2025
Terrain
25-NA-183
2026
GMC
Terrain
Latest software
Step 6. If the cluster display only or both cluster and radio display is still black or blank after following SI diagnostics
and a new radio is needed, these radios are currently restricted through the Electronic Service Center (ESC). Please
contact your preferred ESC to order the new radio. The ESC will require a response to the attestation question
before authorization will be provided. Attestation question: Have you followed, reset the module, installed the latest
software, disconnect and reconnect, and that the radio still requires a replacement?
Important: If the customer complaint is that the radio display intermittently goes blank but always recovers do not
replace the radio as replacing the radio will not correct the issue and please be patient as we address these
issues in upcoming future software releases.
Attestation question: Have you followed PIT6393, and require a radio replacement?
Warranty Information
For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following
labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information.
Labor
Operation
Description
Labor Time
2810335
Radio Reprogramming with
SPS
Use
Published
Labor Time
*3480578
Disconnect and reconnect
Radio module
1.8 Hr.
3420840
Radio Replacement
Use
Published
Labor Time
*This is a unique Labor Operation for Bulletin use only.
Version
10
Modified
06/16/2025 - Created On
07/01/2025 - Updated to add ESC's in Correction and bulletin section, updated Models.
07/25/2025 - Updated bulletin section to current software.
09/15/2025 - Updated bulletin section to current software, updated vehicles in
software table.
09/30/2025 - Updated steps.
10/03/2025 - Updated steps.
10/22/2025 - Updated vehicles and updated steps.
Bulletin No.: PIT6393J
March, 2026
Page 5
12/03/2025 - Updated Correction.
12/22/2025 - Updated bulletin table for LYRIQ and Correction referencing 25-NA-371 and
25-NA-085.
03/06/2026 - Updated model years and correction.
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: PIT6393J
Replacement Service Bulletin Number:
MFR Communication Date: 2026-03-06
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: UNKNOWN OR OTHER
MFR Component System:
MFR Component Subsystem:
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