B17A000 - Internal control unit fault airbag control unit fault

What does error code B17A000 mean in the airbag control unit?

Error code B17A000 reports an internal fault in the control unit of the restraint system itself and therefore does not point to a single component outside it. The airbag control unit stores the entry in the fault memory and switches on the airbag warning light, so that the driver sees the fault.

The restraint system includes the airbags, which are triggered in an emergency, and the control unit that controls their triggering. An internal fault therefore affects the control unit itself and not necessarily a single component.

How do you recognise error code B17A000?

You recognise error code B17A000 by an airbag warning light that remains lit and no longer goes out. The exact entry is only shown by a diagnostic tool that reads the memory of the airbag control unit, because the warning light alone does not reveal the code and says nothing about the cause.

The fault memory is read out with a diagnostic tool. Only then can it be said with certainty whether exactly this code is stored.

If you do not have your own diagnostic tool, it is advisable to have the readout carried out at a specialist workshop.

What causes error code B17A000?

Error code B17A000 originates in the airbag control unit itself and not in a single component or a wire outside it. Whether and which of these triggers applies in an individual case is shown only by an examination of the control unit at a specialist workshop, because a visual check is not enough for this.

• Crash data from an accident stored in the unit
• Aged electronic components in the unit
• Solder joints in the unit
• Moisture or corrosion in the unit
• Voltage spikes from a weak battery or from a jump start

Because the fault lies in the unit itself, the search begins there and not at the wiring.

In which vehicles does error code B17A000 occur?

Error code B17A000 is known on BYD vehicles, specifically on several models of this brand such as Atto 2, Atto 3, Dolphin, Han, Seal, Seal U, Sealion 7, Tang and Dolphin Surf. On other vehicles the meaning may differ, and the list is not complete.

Whether the entry is present on a specific BYD vehicle is determined only by reading out the fault memory.

How is error code B17A000 resolved?

Error code B17A000 is resolved by removing the airbag control unit after reading out the fault memory and sending it to Airbag24 for repair. Before removal, first disconnect the battery, and then create a repair order online for sending it in.

Work on the airbag system belongs in the hands of qualified professionals. For this reason, first have the fault memory read out with a diagnostic tool so that the code is documented, and then disconnect the battery before you remove the control unit.

Checking, repairing and testing usually take 3–4 working days.

The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.