Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. B1920 OBD-II Trouble Code: Air Bag Passenger Circuit Failure

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
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...

Related questions

Q: Throttle body error codes. Car still accelerates.

The codes should have cleared when the battery was disconnected. I would suggest driving the car as normal for a bit to see if they come back on. Chances are if the car is running normally, they have been cleared...

Q: Opinion on car theft through OBD port

Not really. A lot of it is just scam you know. People aren't stealing by plugging it in your car. First, they have to get in to begin with. The only time something like that happens is with high-end stuff...

Q: While I'm driving the accelerator disengages and it won't accelerate with the gas pedal pressed all the to the floor.

This loss of accelerator control is a built in safety feature of the vehicle computer and can render the throttle inactive if it sees a problem in a major component or loses communication with the throttle sensor. I have even...