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Released September 21, 2018. Models A1920, A2097, A2098, A2100. Available as GSM or CDMA / eSIM or nano-SIM / 64, 256, or 512 GB / Silver, Gold, or Space Gray. (Pronounced "iPhone 10 S.")

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What is the TG0B sensor?

Does anybody know what the TG0B sensor is and what could cause thermalmonitord returning “not alive” with context SD: 0 BC: 1 Missing sensor(s): TG0B

When that happens, the shown battery filling level drops to 0% and shortly after it will reboot with the mentioned error in the panic logs.

First I suspected that the error might be related to the lightning port. But replacing it didn’t fix it.

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hi if you solve this problem please tell me what you replacing!


Hello , I am facing the same problem with my iphone . If you have solve this problem ,can you tell me by replacing what you solve this problem?


@mehrajsalfi Start by following @oldturkey03's advice and replace the battery. As he said, sensor TG0B is located on the battery, so that's the place to start.

The sensor is read by two signals that pass through the battery connector and through a couple of components mounted next to the connector. Occasionally a component will get knocked off the board in the process of connecting and disconnecting the battery, which can cause that same error.


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@mfmayer start by replacing the battery. If you already have done this, check the components around the battery connector. Make sure you did not pop one off. Those can be causes for this as well. Ultimately “SD: 0 Missing sensor (s): TG0B” - battery / TIGRIS; result is that the device does not see the battery.

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