When diagnosing an iPhone that is stuck in a boot loop or restarting randomly, the panic log is your best friend. However, decoding the specific strings and hex codes can feel like reading a foreign language.

Below is the complete, categorized master list of iPhone panic log errors, from modern SMC sensor failures to deep logic board NAND faults. Bookmark this page as your daily workbench reference.

1. SMC PANIC – ASSERT / Sensor Array (iPhone 13 to 16 Series)

Starting with the iPhone 13, Apple shifted peripheral check-ins to the System Management Controller (SMC). If a sensor drops offline, the log will output SMC PANIC - ASSERT followed by a specific Hex or Decimal code. Match your code below to find the faulty flex.

🛠️ Workbench Tip: Always check the easiest physical connection first. A ripped charging port flex during a housing swap is the #1 cause of 0x800 and 0x400000 errors.

2. I2C Bus Faults (Line Communication Errors)

An i2c bus hang means the CPU is trying to talk to a chip on a specific data line, but the line is pulled down (shorted) or the chip is dead. You will need a schematic (like ZXW) to verify the exact components on these lines for your specific board.

3. AOP (Always-On Processor) & Watchdog Panics

The AOP handles background tasks like “Hey Siri” and motion detection. Watchdog (WDT) triggers a safety restart if a critical process hangs for too long—usually exactly 180 seconds.

4. Deep Logic Board & Memory Kernel Panics

If you have unplugged all peripheral flexes and the device still boot loops with these codes, the issue is on the logic board itself. Prepare your micro-soldering station.

💡 The “3-Minute Rule” Diagnostics

If the device restarts every 3 minutes exactly, the system is waiting for a missing sensor to report back. Do not touch the motherboard immediately. Unplug the charge port and front earpiece flex, power the device on via prompt-to-boot, and see if the restarting stops. Isolate the parts before attacking the board!