B1929 OBD-II Trouble Code: Air Bag Safing Sensor Output Circuit Open

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the B1929 code

B1929 is a diagnostic trouble code (DTC) for "Air Bag Safing Sensor Output Circuit Open". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $114.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford $114.99 $20.0
Toyota $114.99 $20.0
BMW $124.99 $20.0
SCHEDULE B1929 DIAGNOSTIC Get a fair and transparent estimate upfront

B1929 code definition

The B1929 trouble code indicates that the airbag electronic controller unit (ECU) has detected a circuit malfunction in the airbag system's safing sensor.

What the B1929 code means

The safing sensor acts as a failsafe to ensure the airbag system's crash sensor doesn't go off without appropriate circumstances. If a B1929 trouble code has been reported, it means the safing sensor has been identified as having an incomplete circuit. This will disable the safing sensor (and, by extension, the airbag) until the issue has been solved.

What causes the B1929 code?

In the instance of a B1929 code, the issue is most likely due to a fault in the electrical wiring. Disconnected, shorted, corroded, faulty or otherwise broken wiring may be to blame for the code. The safing sensor itself may also be faulty. In rarer cases, the airbag ECU itself may be malfunctioning, and inaccurately reporting problems as a result. However, due to the rarity of a malfunctioning control unit, it should only be considered if all other potential causes have been exhausted.

What are the symptoms of the B1929 code?

Because the safing sensor needs to be triggered with the crash sensor in order to deploy the airbag, a malfunctioning safing sensor will disable the airbag deployment system. For the sake of diagnosing the issue, a stored B1929 trouble code and an illuminated engine lamp will occur alongside the practical symptoms.

How does a mechanic diagnose the B1929 code?

The B1929 trouble code should be first diagnosed by linking the vehicle up with an OBD-II code reader and reading the code as such. The safing sensor and its circuit should be tested with a voltmeter to check for faulty components and the source of the circuit break. Any wiring relating to the safing sensor circuit should be examined thoroughly to look for signs of damage, disconnection or corrosion. Any potential problem areas should be identified for the repair stage.

Common mistakes when diagnosing the B1929 code

A trouble code relating to body-related (or B-class) issues may stand for different problems, depending on the make of vehicle. This can result in misinterpreting the code if the OBD-II scanner doesn’t describe the specific issue. For instance, in GM models, a B1929 code can refer to a malfunctioning driver's seat heating sensor. Make sure you have interpreted the code properly before moving forward with any repairs.

How serious is the B1929 code?

For as long as the B1929 is unresolved, the airbag deployment system should be considered disabled. This has the obvious effect of making the vehicle less safe in the event of a crash. Other safety precautions most importantly seatbelts, should be seen as even more crucial until the B1929 issue has been addressed.

What repairs can fix the B1929 code?

If the safing sensor has been identified as faulty, it should be repaired or replaced as needed. Any faulty or broken wiring related to the safing sensor and airbag system should be addressed accordingly. In the rare case that the ECU has been cited as faulty, it should be replaced or at least reprogrammed. After your repairs have been finished, restart the vehicle to see if the code returns. Testing the vehicle will let you know immediately whether or not the repairs have succeeded.

Additional comments for consideration regarding the B1929 code

The safing sensor is typically found on the passenger’s side, behind the kick panel. It is located on the passenger’s side in order to make it more sensitive to crash impact.

Other airbag deployment system-related codes may be stored alongside the B1929 code.

Need help with a B1929 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.

OBD-II
trouble codes
B1929

No more waiting rooms! Our mechanics will come to you to diagnose and fix the B1929 code.

SCHEDULE B1929 DIAGNOSTIC
Get a $50 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(7400)

Rating Summary
6879
249
58
41
173
6879
249
58
41
173
 at YourMechanic

David

13 years of experience
393 reviews
David
13 years of experience
Chevrolet Malibu L4-2.4L - Check Engine Light is on Inspection - Marietta, Georgia
He explained everything to me in detail on what I needed to know about my car. Definitely recommend him for getting the job done.
 at YourMechanic

Raymond

37 years of experience
402 reviews
Raymond
37 years of experience
Toyota Camry L4-2.2L - Check Engine Light is on - Las Vegas, Nevada
Raymond did a great job however I was charged for two hours labor and he was only here less than 45 minutes. should I expect this on future appointments with your mechanic ?
 at YourMechanic

Shane

17 years of experience
217 reviews
Shane
17 years of experience
Volkswagen EuroVan V6-2.8L - Check Engine Light is on Inspection - Austin, Texas
Arrived on time. Explained the issues he found and how he will fix it. I have parts on order and will schedule an appointment to have Shane install the parts when they arrive.
 at YourMechanic

Kanstantsin

19 years of experience
51 reviews
Kanstantsin
19 years of experience
Ford F-150 V8-4.6L - Check Engine Light is on Inspection - Littleton, Colorado
Kanstantsin arrived early. Was very courteous and professional. Will highly recommend to anyone. Thank you Kanstantsin.


More related articles

P2322 OBD-II Trouble Code: Ignition Coil H Primary Control Circuit High
P2322 code means that there is a fault in a circuit of an ignition coil due to a faulty ignition coil, circuit or the powertrain control module.
P0588 OBD-II Trouble Code: Cruise Control Vent Control Circuit High
P0588 means an issue with the cruise control vent control circuit, caused by a faulty vent control solenoid or damage cruise control circuitry.
P0558 OBD-II Trouble Code: Brake Booster Pressure Sensor Circuit High
P0558 means there is a voltage problem with the brake booster pressure sensor, likely due to vacuum leaks or a faulty sensor.

Related questions

Engine fault reduced power
It sounds like you could have a sticking boost pressure actuator. Unfortunately, YourMechanic does not work on your model vehicle. I suggest having the dealership take a look at it.
I accidentally drove through 2 feet of water, I have replaced several parts but the car still runs poorly
You did not mention replacing the air filter (https://www.yourmechanic.com/services/air-filter-replacement) after it got wet. The engine and its sensors were not designed to go through water and will get damaged. You may have also damaged internal engine parts like bending engine...
A.I.R. pump is missing in my car
Hello. The A.I.R. system is an emissions system that is designed to inject air into the exhaust manifold to help with the combustion of any unburned fuel before it reaches the catalytic converter, resulting in cleaner emissions. In order to...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com