I concur, it shouldn't matter which key you use.
All I can suggest is to replace the battery in the key (I think the display key still has a real coin battery in addition to the rechargeable one).
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Current inventory:
F22 & G05
Cadillac CT5-V Blackwing w/3 pedals
Past: E24,E28(3),E34,E36,E37,E38(2),E39(4),E46,E89,E92 (obviously),F01,F06,F10,F30,F87,G12,G30(2),G82(2)
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