Skip the auto shop - Our mechanics make house calls

B1928 OBD-II Trouble Code: Air Bag Safing Sensor Output Circuit Failure

diagnostic check engine light

B1928 definition

A B1928 trouble code is related to a vehicle’s air bag safing sensor which protects the supplemental restraint system (SRS) from deploying due to an electrical short.

What the B1928 code means

B1928 is a manufacturer specific OBD-II body code for a circuit failure within the air bag safing sensor. This verifies the force needed to deploy the air bags, serving as a failsafe from accidental deployment. When a B1928 is triggered, it means the sensor circuit has failed to be read during the vehicle’s self-test at startup.

What causes the B1928 code?

The most common causes for a B1928 are:

  • Faulty wiring to or from the air bag safing sensor
  • Faulty air bag safing sensor
  • Faulty battery voltage, resistance, or connection
  • Faulty charging system, i.e. faulty alternator
  • Faulty engine control unit (ECU).

What are the symptoms of the B1928 code?

Most drivers will not notice any different driving characteristics other than a check engine light and or air bag light. If the vehicle is involved in an accident, it’s highly probable the air bags will not deploy.

How does a mechanic diagnose the B1928 code?

Your mechanic first rule out the possibility of an intermittent code caused from a bad battery or battery connection. This will typically involve a couple of self-tests which are conducted when the key is turned to the ‘on’ position.

However, if the code returns after all of this, your mechanic will test the air bag safing sensor using a digital volt meter. If it fails, the sensor will be replaced. If it doesn’t though, your mechanic will test the circuit wiring with to try and pinpoint the source of the fault. Any damaged wiring or connectors will be cleaned, repaired, or replaced.

Common mistakes when diagnosing the B1928 code

It’s important to remember all B1xxx codes are manufacturer specific, so using a professional OBD-II scanner will help eliminate any issues around make and model confusion. Like any air bag code, it’s important to be as cost effective in repairs as possible, starting with simple troubleshooting first before the safing sensor is replaced.

How serious is the B1928 code?

If a B1928 is present, chances are high your entire air bag system will be disabled. This makes repairs important to ensure the safety of occupants.

What repairs can fix the B1928 code?

The most common repairs for a B1928 are as follows:

Additional comments for consideration regarding the B1928 code

A B1928 will likely be found in a Ford, Mercury, Lincoln, or Mazda vehicle. Any work that needs to be conducted on a vehicle’s SRS should be handled by a trained professional. The air bag could unexpectedly deploy while working to fix a B1928.

Need help with a B1928 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

P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem...
How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...
How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...


Related questions

Q: Possible issue with the shift solenoid or TCM?

It could be either one and it's impossible to say without inspecting the car. The difference between the O'Reilly diagnosis and the dealer's is probably one of equipment. O'Reilly uses a generic OBD-II scanner and the dealer should be using...

Q: How do I know that my OBD system is working right?

The OBD system on your vehicle is a self-monitoring system. The Powertrain Control Module monitors and controls all of the systems and functions that regulate fuel, ignition, emissions, and engine cooling as well as having some minor control over air...

Q: Trouble code P0607 Engine Control Module & P0138 Oxygen Sensor Circuit

Replacing an engine control module should never be a first step. There are a number of other problems that can give a PO607 trouble code. First the battery voltage should be checked, and if the engine is running, the charging...