B000113 airbag control unit fault

What does error code B000113 mean?

Error code B000113 indicates a critical interruption in the driver airbag’s ignition circuit, specifically in the first triggering stage (Squib Circuit 1). The airbag control unit detects an abnormal resistance or an open circuit, which prevents the driver airbag from deploying in an emergency and deactivates the entire safety system.

Technically speaking, the monitoring electronics in the control unit register that the electrical circuit leading to the driver airbag’s squib is not closed. This condition, known as “Circuit Open,” points to a physical issue in the wiring or a component and constitutes a safety‑related fault requiring immediate diagnosis.

The control unit then switches to a safety mode, disables the affected airbag module, and illuminates the warning light to alert the driver of the malfunction.

How can you recognize error B000113?

The primary and unmistakable symptom of error B000113 is the persistent illumination of the airbag warning light on the instrument cluster. After starting the vehicle, the light fails to extinguish, indicating that the airbag system has detected a serious fault and is completely deactivated.

In addition to the constantly lit warning light, error code B000113 is stored in the airbag control unit’s fault memory. It can be read out using an appropriate diagnostic tool, providing crucial information about the source of the problem in the driver airbag’s ignition circuit.

Further vehicle‑specific messages may appear on the onboard computer display, signaling a malfunction in the occupant protection system. In any case, the protective function of the driver airbag remains unavailable until the underlying cause is resolved.

What causes error B000113?

The most common cause of B000113 is a physical break in the ignition circuit. This ranges from defective cables or a broken coil spring in the steering wheel, through loose or corroded connectors, to a defect in the squib itself or an internal fault within the airbag control unit.

A major contributing factor is poor or disconnected electrical connections in the steering wheel area. Due to the constant movement of the steering wheel, contacts can loosen or corrode over time, resulting in an open circuit.

A damaged coil spring (also called a slip ring) is another frequent culprit. This component ensures electrical continuity between the rigid steering column and the rotating steering wheel. A break in the conductive traces inside the coil spring directly triggers error B000113.

A faulty ground connection can also alter the overall resistance in the airbag network, causing the control unit to detect an interruption. Less commonly, but still possible, are internal defects on the airbag control unit’s circuit board—caused by moisture damage, corrosion, or failure of electronic components such as resistors or ICs.

Which models experience error B000113?

Error code B000113 has been documented across multiple brands, but it occurs most frequently in certain models from Mercedes-Benz, Chrysler, and Dodge. These include, among others, the Mercedes C-Class (W204) as well as various series such as the Dodge Nitro, Dart, Viper, and Chrysler Newport.

At Airbag24, we repair airbag control units exhibiting error B000113 for the following specific models:

Mercedes-Benz: C-Class W204 Sedan (2007–2014)

Chrysler: Newport 2nd Gen, Newport 3rd Gen

Dodge: Viper 3rd Gen, Nitro 1st Gen, Dart (1st, 2nd, 3rd & 4th Gen), Daytona (1st, 2nd Gen & G), Shadow (1st Gen & P, 1986–1994), Monaco (2nd & 3rd Gen), Omni 2nd Gen

How is error B000113 professionally repaired?

Professional repair requires systematic diagnostics to determine whether the root cause lies externally (wiring, coil spring) or internally within the control unit. If an internal defect is identified, after removal and shipment to Airbag24, a thorough analysis of the circuit board follows, during which faulty components are precisely located and replaced.

Upon receipt at Airbag24, the control unit is first opened and subjected to a visual inspection. Our technicians then perform a detailed electronic examination of the circuit board, checking all relevant trigger circuits—especially those associated with the driver airbag—for defective components such as resistors, capacitors, or integrated circuits (ICs).

Defective parts are carefully desoldered and replaced with new, high‑quality components. Any corrosion caused by moisture is meticulously cleaned, and the conductive traces are restored. Following repair, the control unit undergoes comprehensive functional testing to verify proper operation of all ignition circuits.

The repaired unit is fully functional again and can be reinstalled in the vehicle without any additional coding or programming (plug-and-play). We offer 2 years' statutory liability for defects on all repairs.