B0068 airbag control unit fault

What does B0068 indicate in the airbag control unit?

The error code B0068 denotes a specific, hardware‑based fault in the airbag control unit (SRS module). It points to an internal board defect or to stored crash data that has locked the system. Simply clearing the fault memory in the vehicle is not sufficient; professional repair or a reset of the control unit is absolutely necessary.

Technically, B0068 means the control unit has detected a critical internal condition. This can be caused by damaged SMD components, corrosion, or cold solder joints on the main circuit board.

Alternatively, the fault may occur after a collision when the module stores crash data and locks itself (“Locked by crash”). In this state, the airbag system is completely disabled until the module is unlocked by a specialist.

How do you recognize error B0068?

The primary and unmistakable symptom of error B0068 is a permanently illuminated airbag warning light on the instrument cluster. This indicates a serious defect in the safety system, meaning the airbags would fail to deploy in the event of a crash. The system remains inactive until the fault is resolved.

The warning light does not extinguish after starting the vehicle, indicating a permanently stored and non‑erasable fault.

In some cases, the airbag control unit may also become inaccessible via the OBD interface. Diagnostic tools then cannot establish a connection or retrieve detailed fault information.

What causes B0068?

The most common cause of error code B0068 is internal defects on the control board, such as damaged SMD components or cold solder joints. Secondarily, stored crash data following an accident can lock the module, requiring professional resetting.

Internal hardware faults are the primary source of the issue. These include microscopic damage to components, corrosion due to moisture ingress, or broken traces that trigger system‑wide malfunctions.

The second most frequent cause is the storage of crash data. After airbags or seatbelt pretensioners have deployed, the module locks for safety reasons and must be reset by a qualified service provider.

Which models experience B0068?

Error code B0068 has been documented specifically for Bentley vehicles. Notably, the first generation of the Bentley Continental GTC is affected by this hardware‑related SRS fault, with professional repair of the control unit being the established solution.

At Airbag24, we repair error code B0068 for the following specific model:

Bentley Continental GTC, 1st Generation (model years 2006–2011)

When working on Bentley modules, it’s important to verify after repair or reset that all CAN gateway connections function correctly. Confirm with your service provider whether additional vehicle coding is required or if the repair is plug-and-play.

How is B0068 professionally repaired?

Professional repair of error B0068 begins with an external diagnosis of the removed control unit to determine whether a hardware defect exists or crash data needs to be erased. Defective components are then replaced, or the memory is properly reset, followed by a final functional test with a detailed test report.

After submission to Airbag24, the control unit undergoes a standardized process. First comes an incoming inspection, during which the fault log is read. This step determines whether hardware repair or a pure reset is needed.

If a hardware defect is found, the circuit board is inspected under a soldering microscope. Technicians replace faulty SMD components, repair traces, and fix cold solder joints using specialized rework stations in an ESD‑protected environment.

If only crash data is the issue, it is removed from the EEPROM or flash memory using dedicated programming tools. This reset restores full functionality without compromising the module’s integrity.

Following each repair, a comprehensive final inspection is performed, and a test report is generated. We provide a 12‑month warranty on all repairs.