B1019: SDM System Configuration Error
2 vehicles · 2 makes · $150-$5,000 repair
Most Reported On
B1019 is an OBD-II diagnostic trouble code meaning “SDM System Configuration Error.” General Motors definition. At every ignition cycle the Sensing and Diagnostic Module (SDM, the airbag control module) compares the restraint configuration stored in its memory against the restraint hardware it actually sees on the SRS circuits — deployment loops, impact sensors, pretensioners and seat/occupant hardware. B1019 sets when the detected configuration does not match the programmed configuration, and the SDM disables the entire restraint system so that nothing can deploy incorrectly. Note: this GM definition does not apply to Nissan, where B1019 is used for the Occupant Classification System (OCS) control unit / sensor mat and its link to the airbag diagnosis sensor unit; scope the code to the correct manufacturer before acting on it. This code is most commonly reported on 2013-2019 Cadillac XTS, and 2011-2012 Nissan Leaf (SV, SL), with repair costs ranging from $150 to $5,000.
Common Causes
Typical Repair Cost
Based on 2 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
B1019 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
FAQ
What does B1019 mean?
B1019 stands for "SDM System Configuration Error." General Motors definition. At every ignition cycle the Sensing and Diagnostic Module (SDM, the airbag control module) compares the restraint configuration stored in its memory against the restraint hardware it actually sees on the SRS circuits — deployment loops, impact sensors, pretensioners and seat/occupant hardware. B1019 sets when the detected configuration does not match the programmed configuration, and the SDM disables the entire restraint system so that nothing can deploy incorrectly. Note: this GM definition does not apply to Nissan, where B1019 is used for the Occupant Classification System (OCS) control unit / sensor mat and its link to the airbag diagnosis sensor unit; scope the code to the correct manufacturer before acting on it.
What are the most common causes of B1019?
The most common causes of B1019 are: Airbag control module (SDM) replaced with a unit not programmed/configured to the vehicle's build, A restraint component (seat-mounted airbag, pretensioner, impact sensor, occupant sensing hardware) unplugged, missing or substituted with the wrong part, Damaged or corroded SRS connector under a seat, or a yellow SRS connector not fully latched after seat/interior work, Wrong-VIN or incorrect calibration loaded into the SDM after a repair, Internal SDM fault. The specific cause varies by vehicle.
How much does it cost to fix B1019?
Repair costs for B1019 range from $150 to $5,000, depending on the vehicle and root cause.
Which vehicles are affected by B1019?
Au7o has documented B1019 across 2 vehicle models from 2 manufacturers: Cadillac, Nissan.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.