iPhone 8 — tg0v: Battery
On the iPhone 8, tg0v means: Battery (battery sensors / data line).
What does this code mean?
Watchdog panic: thermalmonitord no longer receives readings from the TG0V battery sensor; with no response for ~3 minutes, iOS restarts the iPhone. No TG0V case found on iPhone 7, 8 or SE 1: attribution by analogy with TG0B and with the iFixit table, which does not specify the model.
Which part to test first?
Check whether the battery percentage is displayed (stuck at 0–1% or “Service” = the iPhone can no longer read the battery), inspect the battery connector pins and the small components around it under the microscope (often torn off during disassembly), test with a known-good battery, then measure the battery data lines at the connector in diode mode (OL = open line).
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 Pro MaxBattery or charging port flex
- iPhone 11 ProBattery or charging port flex
- iPhone XBattery
- iPhone 8 PlusBattery
- iPhone SE (1st generation)Battery
- iPhone 7 PlusBattery
- iPhone 7Battery
Field cases
Did you repair one? Tell us what worked: it improves the database for everyone.