0128 - CAN signal for vehicle configuration lost airbag control unit fault

What does error code 0128 mean in the airbag control unit?

Error code 0128 reports that the CAN signal for the vehicle configuration has failed, that is, the signal with which the central electronics module transmits the vehicle configuration over the CAN bus. If the signal fails to arrive, the airbag control unit stores the fault in the fault memory and switches on the airbag warning light.

The data transmission of the vehicle configuration over the CAN bus is therefore affected. The fault concerns the signal and not directly an airbag module or a sensor.

How do you recognise error code 0128?

You recognise error code 0128 by the airbag warning light on the dashboard staying on permanently and the code being stored in the fault memory of the airbag control unit. The driver cannot permanently erase this entry, and it is read out with a diagnostic tool that displays the complete fault memory.

The warning light alone says nothing about the affected signal. Only the read-out fault memory confirms that the code 0128 is present.

What causes error code 0128?

Error code 0128 is caused by a disrupted transmission of the vehicle configuration over the CAN bus, that is, a signal that fails to arrive. A control unit that does not respond because it is faulty or blocked, an insufficient power supply, a damaged connector or an interrupted data line can also come into consideration as triggers.

• A control unit that does not respond because it is faulty or blocked
• An insufficient power supply to the control unit
• An interrupted or damaged data line on the CAN bus
• A corroded or loose connector in the data line
• A failure of the central electronics module that sends the configuration signal

Which of these causes applies can only be shown by an examination at a specialist workshop.

In which vehicles does error code 0128 occur?

Error code 0128 is known from Aston Martin, in the Cygnet, DBS, DBX, Rapide, Vanquish, Vantage and Virage model lines, as well as in other models of this brand. This also includes several generations of the brand, for example of the Vanquish and the Vantage.

The meaning may differ for other vehicles, and the list is not complete. Always check the specific vehicle before you take any action.

How is error code 0128 resolved?

Error code 0128 is resolved by first reading the fault memory with a diagnostic tool, so that the stored message is known precisely. A specialist workshop then checks the power supply and the data line before deciding whether the control unit itself is affected.

If the findings point to a connector or a line, have these checked as a priority at a specialist workshop. Work on the airbag system belongs in qualified hands.

If the cause lies in the control unit itself, first disconnect the battery and then remove the control unit. Then create a repair order online and send the device to Airbag24. 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.