0x400000 — SMC: silent sensor

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 15 Pro by disconnecting the coil (DFRWS 2025).

On iPhone 15 Pro Max, iPhone 15 Pro

Wireless charging coil (MagSafe, back glass)

High confidenceVerified sourceSMC: silent sensor

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 15 Pro by disconnecting the coil (DFRWS 2025).

First check

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.

iPhone 15 Pro Max ›iPhone 15 Pro ›

On iPhone 14 Plus, iPhone 14

Wireless charging coil (MagSafe, back glass)

High confidenceVerified sourceSMC: silent sensor

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).

First check

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.

iPhone 14 Plus ›iPhone 14 ›

Sources