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. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 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$20.00
Toyota$20.00
BMW$20.00
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.

trouble codes
OBD-II
B1929

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

SCHEDULE B1929 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,170

Rating Summary
4,765
197
50
27
131
4,765
197
50
27
131

Fred

16 years of experience
364 reviews
Fred
16 years of experience
Mercedes-Benz E500 - Check Engine Light is on - Conroe, Texas
Fred was very friendly and thorough to get to the root of the issue. Even when he could not find a fault to why my engine light was on, he went above and beyond to make absolutely sure that the concern was minimized. Turns out, all that needed to be done was a reset but his diagnostic to address my issues was very intricate and appreciated.

David

17 years of experience
37 reviews
David
17 years of experience
Chevrolet Cruze - Check Engine Light is on - Aurora, Colorado
David was on time, professionalisms & honest! I would definitely request him again and pass along to friends/family.

John

18 years of experience
18 reviews
John
18 years of experience
Dodge Ram 1500 - Check Engine Light is on - Memphis, Tennessee
Demonstrated good integrity. Advised me when work I thought needed done was unnecessary and was helpful in identifying issues that needed to be addressed

Robert

21 years of experience
17 reviews
Robert
21 years of experience
Chrysler 200 - Check Engine Light is on - Fort Worth, Texas
Robert did a good job working on my car and letting me know what's needed to keep my car driving smoothly.


More related articles

P2630 OBD-II Trouble Code: Heated Oxygen Sensor (HO2S) Malfunction
P2630 means that the O2 sensor circuit signal that falls outside a range due to a faulty sensor, a short, blown fuse, hi/low fuel pressure or, a leak.
P0039 OBD-II Trouble Code: Turbo Charger or Supercharger Bypass Valve Control Circuit Range and Performance
P0039 P0039 Trouble Code definition P0039 is the code for Turbo Charger or Supercharger Bypass Valve Control Circuit Range and Performance What the P0039 code means Please note that each manufacturer has a slightly different definition for this code...
P2553 OBD-II Trouble Code: Throttle/Fuel Inhibit Circuit Range/Performance
P2553 P2553 code definition The P2553 OBD-II fault code means the Engine Control Module (ECM) has detected an issue with the the throttle or fuel inhibitor circuit, causing a voltage reading more than 10 percent outside of accepted parameters to...

Related questions

Transmission doesn't shift, gets stuck in fail safe mode.

Depending on the circumstances, it may in fact be in "fail-safe" mode. When this happens you will normally also have a Check Engine Light on which will usually cause fault codes to be registered in the ECU. When the vehicle...

OD2 scanner read trouble code P0101

Your computer may not be able to correctly interpret the data from the mass airflow sensor on your engine causing the P0101 code to keep returning. The manufacturer has a Technical Service Bulletin that came out January 30th of 2015....

Computer reads an issue with the oxygen sensor on a Subaru Forester 1999 2.0 Turbo. What is the problem?

Your 1999 Subaru Forester has pre and post catalytic converter oxygen sensors. The pre-converter sensor optimizes fuel trim while the post converter sensor monitors the efficiency of the catalytic converter. A failing pre-converter sensor will degrade vehicle MPG performance. Although...

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