iPhone 16 Pro — sensor array 0x400000: Wireless charging coil

Low confidenceVerified sourceSMC: silent sensor

On the iPhone 16 Pro, 0x400000 means: Wireless charging coil (back glass flex) — otherwise logic board connector / interposer.

What does this code mean?

SMC “BSC failure” panic: the system management controller (built into the SoC) periodically waits for a response from each mandatory sensor; on the iPhone 15 Pro, the value 4194304 (0x400000) corresponds to the wireless coil flex sensor. The 16 Pro keeps the same bit for the charging port (0x300000 on the 15 Pro as on the 16 Pro), hence the attribution by continuity; no source establishes it directly for the 16 Pro yet. With no response, it forces a restart, which repeats roughly every 3 minutes (≈180 s) as long as the sensor stays silent.

Which part to test first?

Check the seating and condition of the wireless coil flex (back glass) and the FPC connector on the logic board (bent pins, torn-off components around it), test with a known-good Apple glass/coil; if the panic persists, measure the connector in diode mode and suspect the interposer (sandwich) after a drop.

The same code on other models

Field cases

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Sources