B0106 airbag control unit fault

What does error code B0106 mean?

Error code B0106 indicates an open circuit in the P‑squib, typically associated with the passenger airbag. The airbag control unit detects a break in the electrical circuit leading to the ignition device. This results in deactivation of the affected airbag circuit and poses a significant safety risk, as the airbag will not deploy in the event of a crash.

This error code is stored by the SRS control unit (Supplemental Restraint System) when the resistance in the passenger airbag’s ignition circuit falls outside the manufacturer‑specified tolerance range. An open circuit means no current can flow, physically preventing the airbag from deploying.

The system continuously performs self‑tests. As soon as such a break is detected, the control unit immediately illuminates the airbag warning light to alert the driver to this critical system fault.

What symptoms indicate B0106?

The primary symptom of error B0106 is a permanently illuminated airbag warning light on the instrument panel. Additionally, the check‑engine light may illuminate, and the airbag warning system may remain active. However, the most telling sign is that the affected airbag system is completely disabled and no longer provides protection.

The red airbag warning light is the clearest indicator. It fails to extinguish after starting the vehicle, signaling a persistently stored, safety‑critical fault.

In some vehicles, the general engine check‑light (check engine light) may also illuminate as an additional indication of a safety‑system malfunction.

The most serious consequence is the deactivation of the airbag. The control unit switches to a safety mode to prevent unintended deployment, but this means there will be no protection from the corresponding airbag in an emergency.

What causes error code B0106?

The main causes of B0106 are physical defects in the electrical circuit. These include damaged or corroded wiring, faulty connectors at the airbag module, or a defective coil spring in the steering wheel. The P‑squib itself or the passenger airbag may also have internal defects that lead to the open circuit.

A very common source of failure is damaged wiring harnesses or corroded connectors. Especially in three‑door vehicles, connectors beneath the seats can suffer mechanical damage due to constant back-and-forth movement, resulting in loose connections or breaks.

The coil spring, also known as the contact spring, is a classic wear part. It ensures electrical connection to the steering wheel airbag and can fracture from continuous steering motions, creating an open circuit.

Other potential causes include the squib within the airbag module itself, defective sensors in the airbag assembly, or water damage to the control unit that leads to internal trace interruptions. Extreme cold can also cause malfunctions in certain control units.

Although B0106 is specific, other error codes—such as B1000 (internal control unit defect), B1010 and B1315 (power supply issues), 65535 (control unit failure), or errors like 0214 and FFFF—may also be stored in the control unit, pointing to broader underlying problems.

Which vehicles are affected by B0106?

Error code B0106 occurs across multiple brands but is particularly prevalent in Toyota, Lexus, Scion, Jaguar, and Pontiac vehicles. Affected models and series often feature airbag system architectures that are susceptible to these electrical faults.

At Airbag24, we repair control units exhibiting error B0106 for the following specific models:

Jaguar: XE S X760

Lexus: LS XF30 (model years 2000–2003, as well as the 2003–2006 facelift)

Pontiac: Sunfire SE

Toyota: Corolla E170 (model years 2013–2018)

How is error B0106 professionally repaired?

Professional repair of error B0106 focuses on eliminating the physical open circuit. After sending the removed control unit to Airbag24, a precise analysis is conducted to pinpoint the fault source at the PCB level and address it appropriately. Finally, the unit is tested and returned ready for installation.

The process begins with the proper removal of the airbag control unit in a workshop. Following simple online order placement, the unit is securely packaged and shipped to Airbag24.

Once at our facility, a comprehensive diagnosis takes place. Technicians use specialized testing equipment to examine traces, solder joints, and internal components relevant to the P‑squib circuit. The identified fault source is then repaired at the component level.

If crash data was additionally stored in the control unit following an accident, it will be erased during the repair process, restoring the module to its factory settings.

After successful repair and final functional testing, the control unit is returned. It is typically ready for immediate installation (plug-and-play) and does not require re-coding in the vehicle. We provide 2 years' statutory liability for defects on the completed repair.