iPhone 11 Pro Max — tg0b: Battery or charging port flex
High confidenceVerified sourceMissing sensor
On the iPhone 11 Pro Max, tg0b means: Battery or charging port flex (the battery connector is on this flex).
What does this code mean?
Watchdog panic: thermalmonitord no longer receives readings from the TG0B sensor, linked to the battery; on the 11 Pro / Pro Max, the battery connector goes through the charging port flex; with no news from it for ~3 minutes, iOS restarts the iPhone, in a loop as long as the sensor stays missing.
Which part to test first?
Test a known-good battery, then a known-good charging port flex (battery connector included); measure the PMU_TO_BATTERY_SWI line in diode mode.
The same code on other models
- iPhone SE (2nd generation)Battery
- iPhone 12 Pro MaxBattery
- iPhone 12 ProBattery
- iPhone 12 miniBattery
- iPhone 12Battery
- iPhone 11Battery
- iPhone XS MaxBattery
- iPhone XSBattery
- iPhone XRBattery
- iPhone 11 ProBattery or charging port flex
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