Code Definition

B1931 — Airbag Crash Sensor #1 Feed/Return Circuit Failure

System: Body  |  Type: Manufacturer-Specific  |  Make: Ford

About B1931

B1931 is a manufacturer-specific body diagnostic trouble code recorded for Ford vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1931 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B1931 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Restraint Control Module (RCM) monitors the feed and return circuits to Airbag Crash Sensor #1, a remote front impact sensor mounted forward of the passenger compartment to provide rapid collision detection. DTC B1931 sets when the RCM detects that the feed/return circuit has failed electrically (typically open or unable to communicate with the sensor), preventing the module from confirming sensor presence or reading valid impact data. This sensor works as part of the multi point crash detection network, sending acceleration signals back to the RCM for deployment decisions during a frontal...

Join TaT to view the complete code information and diagnostic details.

Quick Facts