All buttons on one key fob (Remote Keyless Entry transmitter) may be inoperative on some 2023-2026 Escalade, LYRIQ, Corvette, Silverado 1500, Silverado 2500HD/3500HD, Tahoe, Suburban, Sierra 1500, Sierra 2500HD/3500HD, Yukon; 2024-2026 Traverse, Acadia; 2025-2026 Envision, OPTIQ; and 2026 VISTIQ models. The key fob will operate properly for passively unlocking the vehicle and will allow the vehicle to start as normal when present in the vehicle. The second key fob operates normally.
These conditions may be due to the key fob (Fig. 4, Traverse fob shown) being out of synchronization with the Body Control Module (BCM). Do not replace the key fobs or the BCM for this concern.
Fig. 4
Begin diagnosis by confirming the key fob operation and checking the key fob battery using the EL-52545 TPMS and RF tool. (Fig. 5) After pressing a fob button ten times in a row, verify the fob output is above 20% using the signal strength meter on the EL-52545 tool.
Fig. 5
After verifying the fob battery is good, go to Module Diagnostics > Body Control Module > Data Display > Keyless Entry Data list using GDS2 and view parameters “Synchronization Counter” and “Synchronization Status.” Both values should be the same.
If the Synchronization Status is lower than the Synchronization Counter, press any of the key fob buttons repeatedly to have the values match, which may take up to 255 button presses to resynchronize the fob with the BCM. When the values match, the key fob should begin working properly again.
For more information, refer to #PIT6456.
– Thanks to Jim Will
