00655-007 airbag control unit fault

What does error code 00655-007 mean?

Error code 00655-007 indicates a specific fault in the airbag control unit, related to the igniter of the passenger-side seatbelt pretensioner. Most often, the cause lies within the unit itself—frequently due to stored crash data or an internal hardware defect that locks the control unit and prevents simple clearing of the error.

Technically speaking, this error means the control unit has detected a critical condition in the ignition circuit of the passenger-side seatbelt pretensioner, or it has entered a permanent fault mode following a crash event. This safety mechanism is designed to prevent erroneous deployment or malfunction in the event of another accident.

Once triggered, so-called crash data is stored in the control unit’s non-volatile memory. These data cannot be erased using conventional diagnostic tools, making repair or replacement of the module absolutely necessary.

In addition to crash data, internal defects—such as corrosion on the circuit board caused by water damage or faulty electronic components—can also trigger error 00655-007. The control unit then detects an internal system fault and switches to a safe but inactive state.

How can you recognize error 00655-007?

The most obvious symptom of error 00655-007 is the permanently illuminated airbag warning light on the instrument panel. It does not turn off after starting the engine, indicating that the entire airbag system has been deactivated for safety reasons. Communication with the control unit via diagnostic equipment may also be impaired.

The airbag warning light provides direct visual feedback from the vehicle that a safety-related fault exists. As long as this light remains on, airbags and seatbelt pretensioners will not function in the event of a crash.

Another characteristic is that the error code cannot be cleared with a standard diagnostic tool. Attempts to reset the fault memory fail because the underlying cause—such as stored crash data or a hardware defect—persists.

What causes error 00655-007?

The primary cause of error code 00655-007 is crash data stored in the control unit after an accident. Other common reasons include internal hardware defects caused by water damage or corrosion, faulty connectors to the seatbelt pretensioner, cable breaks, and voltage issues such as over- or undervoltage that can damage the sensitive module.

Following an impact, the airbag control unit locks itself by permanently storing crash data. This state is referred to as “consumed” and prevents further use without specialized repair—even if the airbags were not deployed.

Internal faults on the circuit board are another major cause. Penetrating moisture can lead to corrosion, solder joints may crack, or electronic components like resistors or capacitors may fail, resulting in an internal short circuit or malfunction.

Peripheral issues—external to the control unit—can also trigger the error. These include defective sensors, damaged cables, or corroded connectors, which can be particularly vulnerable in three-door vehicles due to the constant movement of seats.

An unstable electrical supply to the control unit—caused by voltage spikes or insufficient onboard voltage—can likewise disrupt or permanently damage the delicate electronics, ultimately being logged in the fault memory as 00655-007.

Which models experience error 00655-007?

Error code 00655-007 primarily occurs in specific luxury vehicles manufactured by Bentley. Older generations equipped with the corresponding airbag control unit architecture are especially affected. This includes models such as the Bentley Azure, Continental T, and first-generation Continental Supersports.

At Airbag24, we repair error code 00655-007 for the following specifically mapped models:

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

Bentley Continental T, 1st Generation (model years 1991–2002)

Bentley Continental Supersports Mk1

How is error 00655-007 repaired?

Professional repair is a multi-step process performed at the component level. Upon receipt, the control unit undergoes electronic diagnostics to pinpoint the exact source of the fault. Subsequently, stored crash data is erased using specialized equipment, internal hardware defects on the circuit board are rectified, and the module is restored to its factory settings.

After receiving the removed control unit at Airbag24, a comprehensive diagnosis is carried out first. This includes a visual inspection for external damage such as corrosion, along with an in-depth electronic analysis to identify the precise internal fault.

The central step of the repair is safely reading and erasing the crash data from the control unit’s memory. This requires specialized hardware and software that are not publicly available, restoring the device’s core functionality.

If diagnostics reveal defective components, corroded solder joints, or other damage on the circuit board, these are expertly repaired or replaced. Faulty memory areas are reprogrammed or reconfigured to fully restore the control unit.

Upon completion of the repair work, each control unit undergoes a functional test to ensure it operates flawlessly once again. Of course, you receive a 12-month warranty on the repair performed.