PIC6566B Service Bulletin/Repair Instructions

Bulletin No.: PIC6566B
Service Bulletin
Date: January, 2026
PRELIMINARY INFORMATION

Subject:

Brand:
Image Processing Module/Video Processing Module Reset Instructions

Model:
Model Year:

from
VIN:

to
from
Engine:
Transmission:
to
Cadillac
CT4
2023-2026
All
All
All
All
Cadillac
LYRIQ
2024-2025
All
All
All
All
Cadillac
XT4
2024-2025
All
All
All
All
Chevrolet
Blazer EV
2024-2026
All
All
All
All
BrightDrop
Zevo 400
2024
All
All
All
All
BrightDrop
Zevo 600
2024
All
All
All
All
Chevrolet
BrightDrop

400
2025
All
All
All
All
Chevrolet
BrightDrop

600
2025
All
All
All
All
Chevrolet
Colorado
2023-2026
All
All
All
All
Buick
Encore GX
2023 - 2026
All
All
All
All
GMC
Canyon
2023-2026
All
All
All
All
Chevrolet
Silverado EV
2024-2025
All
All
All
All
Chevrolet
Silverado LD
2024-2026
All
All
All
All
Chevrolet
Silverado HD 2024-2026
All
All
All
All
GMC
Sierra LD
2024-2026
All
All
All
All
GMC
Sierra HD
2024-2026
All
All
All
All
Involved Region or Country
Condition
Copyright 2026 General Motors. All Rights Reserved.
United States, Canada, Mexico, Europe, Kazakhstan, Uzbekistan, Russia, Middle East,

Iraq, Israel, Palestine, Argentina (Mercosur), Brazil (Mercosur), Chile (West), Colombia

(West), Ecuador (West), Japan, Cadillac Korea (South Korea), Thailand (ASEAN),

Singapore, Philippines, Australia/New Zealand, Caribbean, China

Some Customers may comment on a condition present on startup when shifting to

reverse gear on the Radio Display where a black screen with a triangle and a camera

with a slash through it is displayed.

In addition, it may not be possible to launch the camera app from the Radio home screen.
Page 2
January, 2026
Bulletin No.: PIC6566B
6713886
The following DTC's may be present as Current DTC's:

DTC Set By DTC Description

U023C SYM00 CGM, EBCM Loss of Communication with VPM

B1596 SYM82 VCU/Radio VPM LVDS Coaxial Signal - Alive Sequence Counter Incorrect

B1596 SYM86 VCU/Radio VPM LVDS Coaxial Signal - Signal Invalid

B1A62 SYM82 CSM/Radio Rear Vision Camera Alive Sequence Counter Incorrect

B1A62 SYM86 CSM/Radio Rear Vision Camera Signal Invalid

Cause
This may be due to software anomalies that may be corrected by a reset of the module.
Correction

Shift to Reverse and verify RVC status. If the screen below appears, start with Step 1.
Bulletin No.: PIC6566B
January, 2026
Page 3
6713886
1. If U023C SYM00 is set as Current by the CGM or EBCM, then check if Warranty Labor Code 3459852 has previously been performed on this vehicle.

a. If this is a repeat visit for the same concern, Replace the VPM (Refer to SI Document: Video Processing Module

Replacement).

b. If this is the first visit for this concern, refer to the chart below and perform fuse reset(s) based on option codes

vehicle is equipped with.
Option code vehicle is equipped

with
Module
Action needed to perform system

reset
IVE and UV2 without UKL
A11 Radio
Refer toPIC6540Radio reset

instructions
IVE with UKL
A11 Radio
Refer toPIC6540Radio reset

instructions
K124 Image Processing Module
Remove and reinstall fuse to K124

Image processing module. Refer to

SI diagnostics for specific vehicle

application
IVD with UKL
K124 Image Processing Module
Remove and reinstall fuse to K124

Image processing module. Refer to

SI diagnostics for specific vehicle

application
IVD and UV2 or UXP without UKL
K157 Video processing module
Remove and reinstall fuse to K157

Video processing module. Refer to SI

diagnostics for specific vehicle

application
UV2 or UXP without IVD or IVE
K157 Video processing module
Remove and reinstall fuse to K157

Video processing module. Refer to SI

diagnostics for specific vehicle

application
c. After fuse pull, perform a 3-minute sleep cycle and then recheck for DTCs

i. If U023C is now in History, Shift to Reverse and verify RVC function.
Page 4
January, 2026
Bulletin No.: PIC6566B
1. Clear DTCs and all ok.

ii. If U023C is still Current, diagnose Power/CAN cable to VPM (Refer to SI Document for U023C) and then recheck

DTCs

1. If U023C is now history, Shift to Reverse and verify RVC function.

a. Clear DTCs and all ok.

2. If U023C is still Current, Replace the VPM ( Refer to SI Document; Video Processing Module Replacement)

2. If B1596 SYM82 SYM86 or B1A62 SYM82 SYM86 are set as Current by the CSM/Radio, check for software

updates of the applicable module(s) based on option codes the vehicle is equipped with.

a. After software update and 3-minute sleep cycle, recheck DTCs.

i. If B1596 / B1A62 are now History, Shift to Reverse and verify RVC function.

1. Clear DTCs, Road test the vehicle (under conditions for setting the DTC), shift to Reverse, verify RVC function.

2. Check DTCs

a. If DTC returns, replace the coax cable between the Radio and VPM.

b. If DTC does not return, all ok.

ii. If B1596 / B1A62 are still set Current, check the coax cable with the Fakra tool (Refer to SI Document # for

B1596 /B1A62).
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
6629852
K124 Image Processing

Module Reset
0.5 Hr.
3459852
K157 Video Processing

Module Reset
0.5 Hr.
Version
3
Modified
08/20/2024 - Created On.

03/28/2025 - Updated models and correction.

01/06/2026 - Updated models.
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.
WE SUPPORT VOLUNTARY

TECHNICIAN

CERTIFICATION

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