NHTSA ID Number: 11022080
Manufacturer Communication Number: PIC6602H
TSB/Document Date: 2025-08-22
Summary
This Preliminary information communicates to dealers steps to follow to obtain an IOK radio.
Bulletin No.: PIC6602H
Service Bulletin
Date: August, 2025
PRELIMINARY INFORMATION
Subject:
Brand:
IOK Radio Issues
Model:
Model Year:
from
VIN:
to
from
Engine:
to
BrightDrop
Zevo 600
2023
All
All
All
All
Corvette
2024-2025
All
All
All
All
Silverado
1500
2022-2026
All
All
All
All
Silverado
2500
2024-2026
All
All
All
All
Silverado
3500
2024-2026
All
All
All
All
Suburban
2022-2024
All
All
All
All
Tahoe
2022-2024
All
All
All
All
Sierra 1500
2022-2026
All
All
All
All
Sierra 2500
2024-2026
All
All
All
All
Sierra 3500
2024-2026
All
All
All
All
Yukon
2022-2024
All
All
All
All
Yukon XL
2022-2024
All
All
All
All
2022-2025
All
All
All
All
Involved Region or Country
United States
Additional Options (RPO)
IOK
Condition
Customers may comment of:
• No audio concerns.
• Blank, Black, Freezing/Frozen, or Glitching Display screen.
• "Return to Dealer" or "Demo Mode" message on the display.
Cause
Concerns may be, software, connection, or hardware.
Correction
Note: If the VIN you need a radio for is part of N252504460 - Customer Satisfaction Program - Radio Replacement
and Reprogramming this PI is not applicable, please call/order as per step 1.4 below and state that the part is
required for a VIN applicable to N252504460 - Customer Satisfaction Program - Radio Replacement and Reprogramming
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:
• 25-NA-121 for 2022-2025 LD trucks. 2024-2025 HD Trucks and 2022-2024 SUVs
Copyright 2025 General Motors
. All Rights Reserved.
Page 2
August, 2025
Bulletin No.: PIC6602H
• 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 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?
2. For audio concerns including intermittent 1-2 second loss of audio or loss of audio for an entire ignition cycle see
PIT6406.
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
*2880298
Update radio to latest
software
0.8 Hrs.
*3480578
Disconnect and reconnect
Radio module
1.0 Hrs.
*3480688
Radio Replacement per
TAC Instructions
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
9
Modified
04/30/2025 Created on.
05/01/2025 - Updated Correction.
05/13/2025 - Updated Correction.
05/29/2025 - Updated Models.
06/19/2025 - Update to the Correction.
06/30/2025 - Update to correction
07/23/2025 - Updated correction to ESC restriction
07/30/2025 - Update to correction
08/14/2025 - Updated to correction to ESC restriction
Bulletin No.: PIC6602H
August, 2025
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.
Page 3
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TSB/Document ID: PIC6602H
Replacement Service Bulletin Number:
MFR Communication Date: 2025-08-15
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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