There may be several audio system conditions on some 2022-2024 Tahoe, Suburban, Yukon; 2022-2025 HUMMER EV; 2022-2026 Silverado 1500, Sierra 1500; 2023 BrightDrop; 2024-2025 Corvette; 2024-2026 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD models equipped with the IOK radio. (Fig. 3) The audio system conditions may include no audible sound, a blank or frozen display screen, a Return to Dealer or Demo Mode message, or a phone connection concern. These issues are covered in the latest version of #PIC6602.
TIP: Due to the frequency of updates to #PIC6602, please do not print this document for future reference. Always refer to the Service Information for the latest version of #PIC6602.
Fig. 3
There are a number of steps to follow to determine if these conditions are related to a software, connection or hardware issue, which may include resetting the radio, verifying system software is up to date, checking that the customer’s phone software is up to date, or performing a data wipe to restore functionality. Additional information can be found in #PIC6002P as well as several other PI’s covering the following issues:
- Blank or black screen – Screens that cannot be viewed (#PIC6540). Perform a radio reset.
- Demo Mode message – A Return to Dealer or Demo Mode message (#PIT6209).
- Radio software update – Verify the latest radio software (Bulletins #25-NA-121, #25-NA-318, #24-NA-168, #25-NA-098.
- Phone connectivity – Make sure a phone is updated to the latest OS version.
- Intermittent audio concerns – Intermittent 1–2 second loss of audio (#PIT6406 – Concern 1). Do not replace the radio or amplifier.
- Radio data wipe – Troubleshooting steps have been updated for the listed audio concerns by utilizing the Radio Data Wipe File (#PIT6209).
Be sure to follow all steps to ensure repairs are completed properly.
Do not replace the radio for any of these issues. These radios are currently restricted through the Electronic Service Center. Ensure that the module has been reset, the latest software installed and that the radio has been disconnected and reconnected.
For more information, refer to the latest version of #PIC6602.
– Thanks to Steve Morris
