Fault code B1826 – a step-by-step guide to diagnosing and fixing it

Error code B1826 is displayed and the check engine light is on - what does this mean?

DTC B1826 is a body control module fault code that is recognized by the OBD/EOBD system and indicates a problem with the driver airbag resistance measurement. This trouble code occurs when the control unit detects a resistance fault in the driver airbag circuit. Depending on the vehicle manufacturer, the name of this fault code may vary slightly.

What causes can this fault code have?

• Defective driver airbag
• Damaged wiring to the airbag module
• Loose or corroded plug connections
• Defective slip ring in the steering wheel
• Faulty airbag control unit
• Interrupted ground wire
• Short circuit in the airbag wiring
• Defective airbag coil cable

What symptoms occur in parallel with fault code B1826?

• Airbag warning light: The airbag indicator light in the dashboard lights up continuously or flashes in a certain pattern.
• Deactivated airbag: The airbag system may be completely deactivated, posing a significant safety risk in the event of an accident.
• Steering wheel problems: Occasionally, problems may occur with other steering wheel-integrated functions such as the horn or cruise control.
• Fault code storage: Additional fault codes related to the airbag system may be stored.

How to fix the problem of fault code B1826?

• Repairing fault code B1826 requires special precautions due to the safety relevance of the airbag system.
• Check and repair the airbag wiring: Inspect all wiring connections to the driver's airbag for damage, corrosion or loose connections and replace defective wiring
• Replace the slip ring in the steering wheel: Remove the airbag slip ring (spiral cable) in the steering wheel and replace with a new spare part
• Replace driver airbag module: Replace the complete airbag module in the steering wheel with a new or reconditioned spare part
• Diagnosing and replacing the airbag control unit: Check the central airbag control unit using professional diagnostic technology and replace if defective
• Clean and secure plug connections: Clean all airbag-relevant plug connections, treat with contact spray and secure properly
• Check ground connections: Check all ground wires of the airbag system for continuity and repair defective connections