NHTSA ID Number: 11031749
Manufacturer Communication Number: PIC6602U
TSB/Document Date: 2026-04-30
Summary
This Preliminary information communicates to dealers steps to follow to obtain an IOK radio.
Bulletin No.: PIC6602U
Service Bulletin
Date: April, 2026
PRELIMINARY INFORMATION
Subject:
Brand:
IOK Radio Issues
Model:
Model Year:
from
VIN:
to
from
to
Zevo 600
2023
All
All
All
All
Chevrolet
Corvette
2024-2025
All
All
All
All
Silverado
1500
2022-2026
All
Silverado
2500
2024-2026
All
Silverado
3500
2024-2026
All
Suburban
2022-2024
All
Tahoe
2022-2024
Sierra 1500
2022-2026
GMC
Sierra 2500
GMC
T
BrightDrop
All
All
All
All
All
All
All
All
All
All
All
All
All
All
All
All
All
All
All
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
2022-2023
All
All
All
All
2024-2025
All
All
All
All
GMC
2024-2025
All
All
All
All
R
AF
All
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.
- Phone connectivity concerns
Cause
Concerns may be software, connection, or hardware.
D
Involved Region or Country
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 1.8 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 radio display concern refer to PIC6629
Copyright 2026 General Motors
. All Rights Reserved.
Page 2
April, 2026
Bulletin No.: PIC6602U
Note: This step does not apply to screens that go blank and recover, if the vehicle comes in with this concern
proceed to step 1.2 and update the vehicle to the latest software
1.1 For a return to dealer or Demo Mode message displayed on the radio screen see PIT6209, if the display shows
Device is Starting and is stuck on that screen, please refer to PIC6630.
1.2 Check current software and verify the radio software is up to date per:
• 25-NA-318 for 2022-2026 LD Trucks, 2024-2026 HD trucks and 2022-2024 SUVs
• 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 the customer came in with a phone connectivity concern, please make sure that the customers phone is
updated to the latest iOS or Android software before proceeding further.
T
1.4. For audio concerns including intermittent 1-2 second loss of audio or loss of audio for an entire ignition cycle
see PIT6406
1.5. If concerns continue perform a radio data wipe by going to SPS, select A11 radio, then select *ONLY USE if
following PIC6630 instructions*- Radio data reset and follow the on screen instructions.
Note: For the purposes of this PI ignore*ONLY USE if following PIC6630 instructions* and perform the data reset
AF
Note: Once this operation is performed, the customer will need to log back into their google account, and repair any
mobile devices that were saved on the radio
1.6 Perform a wiggle test where the wire meets the connector body of the LVDS cable at the radio and display. If
display recovers, replace the LVDS cable
Note: For ease of access please check the LVDS connection at the radio first if display has not been undone from
the vehicle.
1.7 If concerns continue disconnect, inspect, and reconnect all related connections, clear any codes and recheck for
concern.
1.8 After the Date wipe has been performed, if concerns are still present for the symptoms below DO NOT
REPLACE THE RADIO:
• A complete loss of audio over an Ignition cycle or short cuts in audio mentioned in PIT6406.
R
• Phone connectivity issues.
DO NOT REPLACE THE RADIO for these issues as it will not correct the customer's concern. Engineering is aware
of the issue and investigating the root cause we ask to please be patient until a resolution is published.
D
1.9 If concern is still present and is not a software anomaly mentioned in step 1.7, 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?
Bulletin No.: PIC6602U
April, 2026
Page 3
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.
Description
Labor Time
2810335
Update radio to latest
software
Use
Published
Labor Time
*3480578
Disconnect and reconnect
Radio module
1.0 Hrs.
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.
AF
3480688
T
Labor
Operation
*This is a unique Labor Operation for Bulletin use only.
Version
20
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
10/03/2025 - Updated to change labor operation for programming per BQM request
10/08/2025 - Updated to add note to not replace radio for audio issues
10/17/2025 - Updated to add 25-NA-318 for 2022-2023 LD Trucks and 2024 HD trucks
10/23/2025 - Updated to add 25-NA-318 for 24 LD Trucks and 2024 SUVs
11/11/2025 - Update to the correction
11/18/2025 - Update to the correction
12/02/2025 - Update to the correction
02/06/2026 - Update to the correction section removed 25-NA-121 and add all vehicles to
25-NA-318
02/26/2026 - Update to correction to add 2022 SUV's to 25-NA-318
03/06/2026 - Updated to change step 1.5 in correction from PIC6209 to PIC6630
04/23/2026 - Updated to add LVDS cable wiggle test to correction section
D
R
Modified
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: PIC6602U
Replacement Service Bulletin Number:
MFR Communication Date: 2026-04-30
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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