NHTSA ID Number: 11018488
Manufacturer Communication Number: PIC6602B
TSB/Document Date: 2025-05-20
Summary
This Preliminary information communicates to dealers steps to follow to obtain an IOK radio.
Bulletin No.: PIC6602B
Published date: 05/13/2025
Preliminary Information
PIC6602B IOK Radio Issues
Models
Brand:
Model:
Chevrolet
Corvette
Chevrolet Silverado
Chevrolet Silverado HD
Chevrolet Suburban
Chevrolet Tahoe
GMC
Sierra
GMC
Sierra HD
GMC
Yukon
GMC
Hummer EV
Involved Region or
Country
Model Years:
2024
2022
2024
2022
2022
2022
2024
2024
2022
-
2025
2025
2025
2024
2024
2025
2025
2024
2025
VIN:
Engine: Transmissions:
from to
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United States
Customers may comment of:
Condition
Cause
No audio concerns.
Blank, Black, Freezing/Frozen, or Glitching Display screen.
"Return to Dealer" or "Demo Mode" message on the
display.
Concerns may be, software, connection, or hardware.
Correction:
1. For a blank or black screen that cannot be viewed refer to PIC6540 and perform a reset
on the radio to see if display returns, continue with steps below. If display does not return,
follow normal SI diagnostics.
1.1 For a return to dealer or Demo Mode message displayed on the radio screen see
PIT6209.
1.2 Verify the radio software is up to date:
24-NA-261 for 2022-2024 Full Size Trucks and SUV's
25-NA-121 for 2025 Full Size Trucks
24-NA-168 for Hummer 2022-2024
25-NA-098 for Corvette and MY2025 Hummer
If the radio is not at latest software level update the radio, clear all codes and recheck for
concern.
1.3. If concerns continue disconnect, inspect, and reconnect all related connections,
clear any codes and recheck for concern.
1.4. If concern is still present and a new radio is needed, these radios are currently
restricted through Specmo record the results of above testing along with build version
(settings>>about) on the radio screen and start a DCM case with PQC to start the
authorization process for a new radio. PQC will require results from 1.1-1.3 before
authorization will be provided. Radio build version will not be required for blank screen
concerns that do not recover.
2. For intermittent audio concerns please see PIT6367 and for audio concerns lasting a
complete ignition cycle please see PIT6101Q
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
Update
*2880298
radio to latest software
*3480578
Disconnect
and reconnect Radio module
*3480688
Radio
Replacement per TAC Instructions
0.8 Hr.
1.0 Hr.
MY22-25 Hummer SUV and
Pickup 1.1 Hrs
MY22.5-25 Silverado and
Sierra 1500 1.2 Hrs.
MY24-25 2500/3500HD 1 Hr.
MY24-25 Corvette 1.3 Hrs.
MY22-24
Tahoe/Suburban/Yukon/Yukon
XL 1.1 Hrs.
*This is a unique Labor Operation for Bulletin use only.
Version History
Version
3
Modified
04/23/2025 - Created on.
05/01/2025 - Updated Correction.
05/13/2025 - Updated Correction.
GM Global Brands
© 2025 General Motors. All Rights Reserved.
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TSB/Document ID: PIC6602B
Replacement Service Bulletin Number:
MFR Communication Date: 2025-05-14
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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