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B1945 is a diagnostic trouble code (DTC) for "Airbag Crash Sensor #2 Ground Circuit Open". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
A B1945 code means that the vehicle’s onboard diagnostic system has detected an open circuit condition in the airbag circuit, and has registered a trouble code.
Crash sensor monitors are set to register the severity of a crash event. If the impact is severe enough, the sensor will trigger the Restraints Control Module (RCM) and deploy the passenger side air bag. The RCM monitors the two-wire current loop for the passenger side crash sensor and will register if a signal is out of expected range. When the RCM detects an out of range signal for the passenger side crash sensor, that will indicate a sensor communication fault and the RCM will store trouble code B1945.
As with many codes, technicians often jump ahead on a B1945 code without doing a proper process of elimination and end up replacing parts unnecessarily. In most cases, a B1945 code is due to damaged, corroded or loose wiring or terminals on the passenger side crash sensor. The sensor is located near the passenger side headlight or radiator core support.
A B1945 code can result in the airbag not deploying in a collision.
Any airbag-related work might be best left up to a professional. Accidental deployment of the airbag can result in serious injury. On Ford vehicles, the airbag malfunction lamp will self-diagnose for the driver by blinking in sequence. For example, on a B1945 code the lamp will blink four times, pause, then blink five times to denote “45.”
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.