Dtc B123a Renault Link -

Yes, a low voltage event (jump-starting, dying battery) can cause the airbag ECU to log random codes, including B123A. Always clear codes after replacing your battery.

You rarely get just a code. If B123A is active, you will notice: dtc b123a renault link

Critical Safety Note: When DTC B123A is active, the seat belt pretensioner may NOT deploy during a collision. This is a critical safety system. Do not ignore this code. Yes, a low voltage event (jump-starting, dying battery)

Location: Inside rear left door panel – the handle’s 2-pin or 3-pin connector. Critical Safety Note: When DTC B123A is active,

Renault OEM part number example (confirm for your model/year):

The buckle contains a hall-effect sensor or a mechanical switch. If this fails, it sends the wrong status to the ECU, which interprets it as a link interruption.

If the connector itself is melted or broken, cut it out and solder the wires directly (bypassing the connector). This is a permanent fix for "Link" faults caused by connector resistance.