Code Definition

B1945 — Airbag Crash Sensor #2 Ground Circuit Open

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

About B1945

B1945 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 B1945 is stored, the module has detected an open (broken or disconnected) electrical path 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.

B1945 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) provides a dedicated low side ground return for each remote front impact sensor rather than relying on a generic chassis ground, so the module can monitor the integrity of the sensor circuit independently. DTC B1945 is set when the RCM detects that the dedicated ground return for crash sensor number 2 (typically the front right impact sensor) is open, meaning the return path between the sensor and the RCM has been broken. Common causes include a disconnected sensor connector after collision repair, a broken wire in the front end harness, and a damaged sensor...

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