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B1907 OBD-II Trouble Code: Air Bag Crash Sensor #2 Ground Circuit Failure

diagnostic check engine light

B1907 code definition

The B1907 trouble code detects a circuit failure in the #2 airbag crash sensor.

What the B1907 code means

The B1907 code is a generic OBD-II trouble code that implies a #2 airbag crash sensor circuit malfunction. The #2 crash sensor is used, along with the other crash sensors, to determine when the vehicle is experiencing extreme impact, so that the airbags can be deployed. As the number and location of the airbag crash sensors varies from vehicle to vehicle, there is no specific location that the #2 crash sensor will be placed in. If the body control module, airbag control module, or powertrain control module (PCM) detect a circuit voltage reading from the #2 airbag crash sensor that is unusual, then the B1907 code might be triggered.

What causes the B1907 code?

There are two fairly common causes of the B1907 trouble code. The first is damaged or defective electrical components, such as the wires, fuses, or connectors in the system, or even the circuit itself. The second is a faulty #2 airbag crash sensor. It is also possible, though very rare, that a defective PCM, airbag control module, or powertrain control module is causing the B1907 code.

What are the symptoms of the B1907 code?

When the B1907 code is detected, the check engine soon Warning Light will likely illuminate on the gauge cluster, and the airbag Warning Light may illuminate as well. In most cases, the airbag system will not properly function, so the airbags will be unlikely to inflate in the event of an accident.

How does a mechanic diagnose the B1907 code?

The B1907 code will be diagnosed using a basic OBD-II trouble code scanner. A reputable mechanic can use the scanner to look at the freeze frame data and gather information about the B1907 code, while also checking to see if there are any other trouble codes present. If there are, then the codes should be addressed in the order that they appear in. The trouble codes will then be reset, the vehicle restarted, and the B1907 code checked for. If the code is no longer detected, then it was likely triggered inaccurately, or is the result of an intermittent issue.

If the B1907 code remains present, then the mechanic will visually inspect the fuses, wires, and connectors in the crash sensor system, and replace any that are damaged or otherwise compromised. The circuit will then need to be checked, followed by an inspection of the #2 airbag crash sensor.

After any part is replaced, the codes will again need to be reset, the vehicle restarted, and the B1907 code checked for. By doing this, the mechanic will know as soon as the problem is resolved.

Common mistakes when diagnosing the B1907 code

The most commonly made mistake when diagnosing the B1907 code comes from a failure to properly adhere to the OBD-II code diagnosis protocol. The diagnosis protocol should by complied with during every diagnosis, to help guarantee efficient and accurate inspections and repairs.

Often, operational airbag crash sensors are erroneously replaced when the electrical components are not first inspected.

How serious is the B1907 code?

A vehicle with a detected B1907 trouble code will display no drivability problems. The airbag system will likely be inoperable though, which means that the driver and passengers will not have airbags if an accident happens. Airbags are important safety features that can save lives, so the vehicle should not be driven until an inspection and repair have taken place.

What repairs can fix the B1907 code?

Possible repairs for the B1907 trouble code are:

  • Replacement of the #2 airbag crash sensor circuit
  • Replacement of the wires, connectors, or fuses
  • Replacement of the #2 airbag crash sensor
  • In rare cases, replacement of the airbag control module, body control module, or PCM

Additional comments for consideration regarding the B1907 code

The B1907 code is a manufacturer specific trouble code. Manufacture specific codes are trouble codes that have different definitions depending on the automaker. For some cars, the B1907 code will detect a different issue than a #2 airbag crash sensor circuit failure. Mechanics should always pay attention to the vehicle they are inspecting when diagnosing this code.

Need help with a B1907 code?

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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
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