Code Definition

B1906 — Airbag Crash Sensor #2 Feed/Return Circuit Short To Ground

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

About B1906

B1906 is a manufacturer-specific body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1906 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit; and 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.

B1906 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 Restraints Control Module (RCM, also called the Airbag Control Module or SRS module) monitors each remote crash sensor through a dedicated two wire feed and return loop, supplying a small bias to the sensor and reading its acceleration data while watching the loop integrity. DTC B1906 sets when the RCM detects that the feed or return wire on Crash Sensor #2 has gone to a low voltage state consistent with a short to ground, meaning one of the loop conductors is making an unintended path to chassis ground. The specific physical location of Crash Sensor #2 varies between manufacturers; common...

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