tg0v — Missing sensor

Watchdog panic: thermalmonitord no longer receives readings from the TG0V sensor, linked to the battery (voltage / fuel gauge data); with no news from it for ~3 minutes, iOS restarts the iPhone, in a loop as long as the sensor stays missing.

On iPhone SE (2nd generation), iPhone 12 Pro Max, iPhone 12 Pro, iPhone 12 mini, iPhone 12, iPhone 11, iPhone XS Max, iPhone XS, iPhone XR

Battery (battery sensors / data line)

High confidenceVerified sourceMissing sensor

Watchdog panic: thermalmonitord no longer receives readings from the TG0V sensor, linked to the battery (voltage / fuel gauge data); with no news from it for ~3 minutes, iOS restarts the iPhone, in a loop as long as the sensor stays missing.

First check

Check whether the battery percentage is displayed (a reading stuck at 0–1% reveals lost battery data), inspect the battery connector (bent pins), test with a known-good battery, then measure the connector's data lines in diode mode.

iPhone SE (2nd generation) ›iPhone 12 Pro Max ›iPhone 12 Pro ›iPhone 12 mini ›iPhone 12 ›iPhone 11 ›iPhone XS Max ›iPhone XS ›iPhone XR ›

On iPhone 11 Pro Max, iPhone 11 Pro

Battery or charging port flex (the battery connector is on this flex)

High confidenceVerified sourceMissing sensor

Watchdog panic: thermalmonitord no longer receives readings from the TG0V 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.

First check

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.

iPhone 11 Pro Max ›iPhone 11 Pro ›

Sources