What Is the Citroën Nemo Airbag ECU and the B0100-49 Fault Code

When you use a diagnostic tool on your vehicle and it reports the fault code B0100-49, it indicates an internal fault inside the airbag ECU itself — not citroen nemo Airbag ECU B0100-49 Repair a problem with individual sensors or wiring outside the unit. In essence:

B0100 typically means an internal electronic error in the airbag ECU.

The suffix -49 usually specifies that this is a particular internal fault code pointing to hardware or electronic malfunction within the control module.

This fault can cause the airbag warning light to remain on permanently and may prevent the airbags or pretensioners from functioning correctly in a crash — a serious safety issue.

Why B0100-49 Happens

The B0100-49 internal fault can be caused by a few different things:

Hardware damage inside the ECU: Components like microprocessors, memory chips, or other circuitry on the ECU’s internal board can fail due to age, manufacturing defects, or environmental stress.

Voltage issues: Power surges, undervoltage events, poor battery health, or sudden loss of electrical power (e.g., battery changes or jump starts) can corrupt the ECU’s internal data or damage sensitive electronics.

Internal data corruption: If the ECU’s crash data memory becomes corrupted — even without a collision — the unit may detect this as an internal error and set code B0100-49.

Moisture or corrosion: Moisture ingress or corrosion on internal circuit boards can also cause unpredictable faults and trigger this code.

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