iPhone 14 — sensor array 0x400000: Wireless charging coil

High confidenceVerified sourceSMC: silent sensor

On the iPhone 14, 0x400000 means: Wireless charging coil (MagSafe, back glass).

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; here, the sensor carried by the wireless coil flex has stopped responding. With no response, it forces a restart, which repeats roughly every 3 minutes (≈180 s) as long as the sensor stays silent. Reproduced on iPhone 14 Plus by disconnecting the coil (DFRWS 2025).

Which part to test first?

Check the wireless coil flex (back glass) and its connector: seating, creases, corrosion; test with a known-good back glass/coil from the same model.

The same code on other models

Field cases

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Sources