B1400 is the Hyundai and Kia code for a driver front side impact sensor that has failed internally. Hyundai's own list words it as SIS front driver defect. The sensor is a small satellite unit outside the control module, and the fix is the sensor or its connection, so there is nothing here for a module reset to clear.
Hyundai and Kia hang side impact sensors off the restraint control module, the SRSCM, so the system can tell the difference between a hard bump and a real side collision. Hyundai describes the side impact sensors as mounted at the center pillar on both sides of the vehicle, where they pick up the sharp acceleration of a hit from the side. Some later models use a pressure type sensor in the front door instead, reading the pressure spike as the door skin deforms.
Neither type fires anything on its own. When a side impact sensor reports a collision, the SRSCM checks its own internal safing sensor, and only when both agree does it deploy the side airbag and curtain on that side. That second opinion is why the module watches every sensor it depends on so closely.
B1400 is the result of one of those checks. The driver front side impact sensor answered the SRSCM but reported a fault inside itself, which is different from a sensor that has gone silent. Silence on the driver side reads as B1409, a communication error, and a sensor that answers with the wrong identification reads as B1330. With B1400 stored, the SRS warning lamp is on and the driver side restraints should not be counted on until the sensor is replaced.
Hardware. B1400 is the module reporting a failed part, not a record of anything that happened to the vehicle, so there is no locked crash memory behind this number. On Hyundai and Kia the stored deployment records carry their own codes in the B1650 and B1670 family, and those are the ones that lock a module. If a side collision is what brought the vehicle in, expect both: a crash record in the SRSCM and impact sensors that need replacing.
No. Clearing the code with a scan tool sends the SRS lamp out for one key cycle at best, and the module sets B1400 again on the next self test because the sensor is still bad. Replace the sensor, then clear. Our airbag module reset is for an SRSCM holding crash data after a deployment, which is a different job. If the sensor is what you need, we stock genuine OEM impact sensors by year and model.
B1400 in this reading is Hyundai and Kia, on vehicles built around the SRSCM, with Genesis models on the same restraint architecture behaving the same way. Kia service data carries the same SIS front driver wording for the code. Outside that family the number means something else entirely, since B1400 is one of the more heavily reused manufacturer specific codes in circulation, so match the code to the make before you order a part.
Start at the connector rather than the parts counter. Disconnect the battery, wait, then pull the sill trim on the driver side and look at the sensor connector and the harness that feeds it. Corrosion points at water, and water points at a door seal or a blocked drain that needs fixing before the new sensor goes in. A connector that never latched is a free repair.
If the connector and harness are clean, the sensor is the part. Replace it, clear the code, and confirm the light stays out through several key cycles. B1409 is the communication error on the same sensor, B1403 is the passenger side version, and B1328 covers the driver front impact sensor in the nose of the vehicle.
Related codes: B1409, B1403, B1328, B1330
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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