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B1920 OBD-II Trouble Code: Air Bag Passenger Circuit Failure

diagnostic check engine light

B1920 code definition

A B1920 trouble code indicates that a circuit failure has been detected relating to the airbag deployment system on the passenger's side.

What the B1920 code means

In the case of B1920 trouble code, the vehicle's Engine Control Unit (ECU) has registered a general failure of the passenger side airbag's circuit. If the passenger airbag's circuit isn't functioning properly, this will have the likely effect of disabling the airbag from deploying when it is triggered by the crash sensor.

What causes the B1920 code?

Disconnected, broken, damaged and otherwise faulty wiring may be to blame for a B1920 trouble code. In some cases, the airbag module itself may be faulty; if this is the case, it will need to be replaced. In rarer instances, the ECU may be reporting the issue falsely. If this has been verified, the ECU will have to be replaced independently on other issues related to the airbag system.

What are the symptoms of the B1920 code?

If a B1920 trouble code has been registered, the passenger side airbag should be considered disabled and cannot be relied upon to function in the event of a crash impact. In addition, a stored B1920 trouble code and illuminated check engine lamp will be activated for the sake of diagnosing the issue.

How does a mechanic diagnose the B1920 code?

A mechanic can diagnose the B1920 trouble code by inputting the vehicle computer with an OBD-II code reader. A voltmeter or Autohex scanner can be used to pinpoint the source of the short damage along the circuit. Any wiring related to the passenger airbag circuit should be tested for signs of fault, including damage, disconnection and/or corrosion.

Common mistakes when diagnosing the B1920 code

Trouble codes relating to the body of a vehicle (also known as "B-class" trouble codes) sometimes describe different issues depending on the particular type of vehicle in question. Your OBD-II scanner may specify the code description for you. Refer to the vehicle's user manual or contact the manufacturer if you're uncertain.

How serious is the B1920 code?

Although a B1920 trouble code will not affect a vehicle's drivability, the lack of a proper passenger side airbag feature may pose safety concerns for any passengers. If the vehicle isn't used by passengers, a lack of passenger airbag may be disregarded for the time being.

What repairs can fix the B1920 code?

Any disconnected, corroded, broken or damaged wiring should be repaired or replaced accordingly. If the ECU and/or airbag module have been cited as faulty, they will require reprogramming or replacement. Following any repairs made for a B1920 code, the vehicle should be retested to help ensure the fix has been successful.

Additional comments for consideration regarding the B1920 code

Make sure the ignition has been turned off for at least five minutes before moving on to repair anything associated with the airbag system. Accidentally triggering the airbag during repair can result in severe injury or death.

Need help with a B1920 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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