B1101 on a Hyundai, Kia, or Genesis means the airbag control module saw supply voltage above its acceptable range. The SRSCM checks input voltage at key-on and sets this code when the reading stays high for more than four seconds. The problem is in the electrical system, and the module itself is usually fine.
Hyundai and Kia call the airbag brain the SRSCM, short for supplemental restraint system control module. Firing an airbag takes a precise amount of current at a precise moment, so the module refuses to operate outside a defined voltage window. Hyundai service data for the SRSCM generation that uses this code puts that window at roughly 8.4 to 17 volts.
When input voltage climbs above the threshold and stays there past about four seconds, the SRSCM stores B1101 and turns on the air bag lamp. While that lamp is lit the restraints are disabled, so the airbags and pretensioners will not fire in a collision. That is the part that makes this more than a nuisance light on the dash.
The code is a report about the power reaching the module. It says nothing about the airbags, the pretensioners, or the crash sensors.
Circuit. B1101 is a supply voltage report, so the repair lives in the charging system and the wiring rather than in the restraint hardware. The module is the messenger here. Sustained overvoltage can damage electronics though, so if the code stays after the charging system is corrected, the SRSCM may have taken the hit.
Usually there is nothing to reset. Correct the charging fault, clear the code with a scan tool that reaches the SRS, and the lamp goes out. A module reset is the answer when the SRSCM is holding locked data no scan tool can erase, which is a different situation from a voltage code. If B1101 will not clear after the electrical repair, send the module in and we will test it through our module service, or search airbag control modules if it turns out to be damaged.
B1101 in this form is Hyundai, Kia, and Genesis, on the later SRSCM generation used from the mid 2000s forward. Earlier Hyundai and Kia systems reported the same high voltage condition as B1111, so which number your car sets depends on the module generation rather than on the fault. Codes in the B1100 range are manufacturer specific, so read this one against the make.
Measure charging voltage at the battery with the engine at about 2,500 rpm and the accessories switched on. Anything above the mid 14 volt range on a normal 12 volt system points at the regulator or the alternator. Check the SRSCM ground for resistance under one ohm and inspect the connector for pushed back or corroded pins. Once the electrical side reads normal, clear the code and drive it a few days before deciding anything else is wrong. Related codes: B1102 for the low voltage side, B1111 on the older systems, and B1318.
Related codes: B1102, B1111, B1318
Keep reading:
Code scope: Hyundai, Kia, Genesis. The same number can mean something different on another manufacturer, so match the code to your make before you act on it.
A reset clears stored crash data. A replacement part fixes a hardware fault. We have read these codes since the nineties and will tell you which one you are looking at.
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