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

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...


Related questions

Q: Error code P0171 and P0374

Hi and thanks for contacting YourMechanic. If the vehicle went into limp mode, then the computer is making this happen to prevent the engine from any damage. Check the camshaft sensor for proper timing to the camshaft. Look at the...

Q: Failed smog test. OBD-II monitors not ready. Needs to be reset

Hello. If your monitors are showing not ready, then that is because the computer was recently reset or the battery may have been replaced. If either of these occurred, then there is a specific amount of driving that needs to...

Q: The Check Engine Light came up with the code P2017, what do I need to replace?

If you are getting this code it is due to one of two things. The vast majority of the time it is caused by a failure in the variable charge motion actuator, which is the same part that you mentioned....