PIT6393E Service Bulletin/Repair Instructions

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.

Note: If symptom is related to a phone issue, please also make sure the customers phone is fully up to date.

Note: If the build number on the radio display matches the build number on the latest software bulletin chart, then

radio is up to date do not attempt to program the module. If there is an update available only perform the

programming sequence once. To find the build number in the radio please go to Settings>>System>>About>>Build

Number

· Phone Projection/ Bluetooth/ Connectivity (IE Carplay and Android auto connection issues)

· 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 3. 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 4. If concern is related to a blank or black

cluster display that does not recover, proceed to step 5.

Step 4. 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
Bulletin No.: PIT6393E
October, 2025
Page 3
Model Year
Brand
Model
Latest Software Bulletin
2024
Bright Drop
Zevo 400/600
24-NA-092
2024
Buick
Envision
25-NA-183
2024
Cadillac
LYRIQ
24-NA-193
2024
Cadillac
XT4
25-NA-183
2024
Chevrolet
Blazer EV
24-NA-193
2024
Chevrolet
Equinox EV
24-NA-193
2024
Chevrolet
Silverado EV WT/RST
25-NA-085
2024
Chevrolet/GMC
Traverse/Acadia
25-NA-183
2024
GMC/Chevrolet
Canyon/Colorado
24-NA-193
2024
GMC
Sierra Denali EV
25-NA-085
2025
Buick
Envision
25-NA-183
2025
Cadillac
CT5
25-NA-085
2025
Cadillac
CT5 V and Blackwing only
25-NA-085
2025
Cadillac
Escalade IQ
25-NA-085
2025
Cadillac
Escalade/Escalade ESV
25-NA-183
2025
Cadillac
LYRIQ
Latest Software
2025
Cadillac
OPTIQ
25-NA-085
2025
Cadillac
XT4
25-NA-183
2025
Chevrolet
Blazer EV except SS
24-NA-193
2025
Chevrolet
Blazer EV SS Only
Latest Software
2025
Bright Drop
Zevo 400/600
24-NA-193
2025
Buick
Enclave
25-NA-183
2025
Chevrolet
Equinox
25-NA-183
2025
Chevrolet
Equinox EV
24-NA-193
2025
Chevrolet
Silverado EV WT
Latest Software
2025
Chevrolet
Silverado ESV RST
25-NA-085
2025
Chevrolet
Tahoe/Suburban
25-NA-183
2025
Chevrolet
Traverse
25-NA-183
2025
GMC/Chevrolet
Canyon/Colorado
25-NA-085
2025
GMC
Acadia
25-NA-183
2025
GMC
Sierra Denali EV
25-NA-085
2025
GMC
Terrain
25-NA-183
2025
GMC
Yukon/Yukon XL
25-NA-183
2026
Buick
Enclave
Latest Software
2026
Cadillac
VISTIQ
Latest Software
2026
Chevrolet
Equinox
Latest Software
2026
Chevrolet
Traverse
Latest Software
2026
GMC
Acadia
Latest Software
2026
GMC
Terrain
Latest Software
Step 5. 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?

Attestation question: Have you followed PIT6393, and require a radio replacement?
Page 4
October, 2025
Bulletin No.: PIT6393E
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 Use

SPS

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.
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?

Attestation question: Have you followed PIT6393, and require a radio replacement?

Version
6
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.
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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