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2023 GMC Sierra 1500 — wireless CarPlay drops at the same intersection

FlatSixMechanicish898Community StarterMay 19, 20262023 GMC Sierra 1500 AT4Bay Area
2023 GMC Sierra 1500 AT4, about 37,500 miles. Wireless CarPlay is reliable almost everywhere but disconnects at the same intersection on my commute. Does consistent location point strongly to RF interference, and what would you test to confirm? I am trying not to assume the first explanation I see online.
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6 replies

QuietHauler799Community StarterCommunity StarterMay 20, 2026permalink
If it were in my driveway, move a coil or plug on the 2023 GMC Sierra 1500 if it's cylinder-specific and see whether the code follows. You'll know quickly if you're on the wrong tree. This is from a 2023 GMC Sierra 1500 in Bay Area with 37,500 miles. Learned this the expensive way on a previous car. Cold start is when I can actually reproduce it.
PistonBuilder720Community StarterCommunity StarterMay 20, 2026permalink
Intermittent stuff lies if you only catch it once. Get a real battery/charging test on the 2023 GMC Sierra 1500, not just resting voltage, before blaming a module. Don't erase codes until someone who can help has seen them. On “wireless carplay drops at the same intersection,” that was the fork that mattered for me. I'd want that in writing, not as a promise. I already checked the easy fluid levels.
BrakeCommuterCommunity StarterCommunity StarterMay 21, 2026permalink
Fair point. Counterpoint: If a shop can't duplicate it on the 2023 GMC Sierra 1500, bring a video plus freeze-frame data, not just a story. Don't erase codes until someone who can help has seen them. Time, temperature, and whether it's in gear are the notes that actually help a shop. Doing the boring step first on purpose.
UsedCarDIYer737Community StarterCommunity StarterMay 22, 2026permalink
Asking because it changes the advice: Write temp, speed, and in-gear vs coast when the 2023 GMC Sierra 1500 does it — then decide on parts. Don't erase codes until someone who can help has seen them. Post the numbers (or the code) and people can get more specific. Doing the boring step first on purpose.
HighwayScout41Community StarterCommunity StarterMay 22, 2026permalink
I hear you, though I'd still want a second check. Capture voltage while the 2023 GMC Sierra 1500 is actually failing — after it restarts you've lost the clue. If the cheap test changes it, stop and reassess. On “wireless carplay drops at the same intersection,” that was the fork that mattered for me. This is from a 2023 GMC Sierra 1500 in Bay Area with 37,500 miles. If they can't show the line item, I assume it's hiding. If your situation is the opposite, ignore me. I'd rather pay for diagnosis than a second guess-repair.
BrakeCommuterCommunity StarterCommunity StarterMay 22, 2026permalink
Asking because it changes the advice: Move a coil or plug on the 2023 GMC Sierra 1500 if it's cylinder-specific and see whether the code follows. Save the big job until that test fails. Write the result down so the next test isn't a repeat of the last one. Heat soak after errands is the other window.
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