AutoCodes – Generic – B1102

B1102 Code - Airbag Battery Voltage Low

Quick Answer

When the ignition switch is turned to ON, the Sensing and Diagnostic Module (SDM) will perform turn-on test to diagnose critical malfunctions within SDM itself. Common causes include Faulty Sensing and Diagnostic Module (SDM), Sensing and Diagnostic Module (SDM) harness is open or shorted, Sensing and Diagnostic Module (SDM) circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B1102 indicates Airbag Battery Voltage Low.
Common causes: Common causes include Faulty Sensing and Diagnostic Module (SDM), Sensing and Diagnostic Module (SDM) harness is open or shorted, Sensing and Diagnostic Module (SDM) circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 27,722

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 22, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1102 Description

When the ignition switch is turned to ON, the Sensing and Diagnostic Module (SDM) will perform turn-on test to diagnose critical malfunctions within SDM itself.
Upon passing these test ignition and deployment loop voltages are measured to ensure that they are within their normal voltage ranges. The SDM monitors the voltages at the driver low and the passenger low to detect shorts to ground or voltage in the deploy loops.
The SDM checks the wiring connection to each inflator by letting the infinitesimal current flow through the internal circuit and verify the resistance. But if the voltage is out of range, SDM is unable to check the airbag system properly.

OBDII Code B1102 - Airbag Battery Voltage Low - AutoCodes.com — B1102 Code - Airbag Battery Voltage Low

What does this mean?

What are the Possible Causes of the DTC B1102?

Faulty Sensing and Diagnostic Module (SDM)
Sensing and Diagnostic Module (SDM) harness is open or shorted
Sensing and Diagnostic Module (SDM) circuit poor electrical connection

How to Fix the DTC B1102?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1102 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B1102 code?

Need more information on how to fix the B1102 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1102 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1102 Buick — Battery Voltage Too Low
B1102 Cadillac — Battery Voltage Too Low
B1102 GMC — Battery Voltage Too Low
B1102 Hyundai — Airbag Battery Voltage Low
B1102 KIA — Airbag Battery Voltage Low

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1102 Code

1. What are the common symptoms of OBDII code B1102 (Airbag Battery Voltage Low)?

When the B1102 code is triggered, you may notice the airbag warning light illuminated on the dashboard, indicating a potential issue with the airbag system.

2. What are the possible causes of OBDII code B1102 (Airbag Battery Voltage Low)?

The B1102 code can be caused by a weak or failing battery, poor electrical connections, a faulty airbag control module, or issues with the wiring harness.

3. How serious is OBDII code B1102 (Airbag Battery Voltage Low)?

The B1102 code should be addressed promptly, as it indicates a potential problem with the airbag system's power supply. If left unresolved, it could compromise the effectiveness of the airbags in the event of a collision.

4. Can I continue driving with OBDII code B1102 (Airbag Battery Voltage Low) present?

It is not recommended to drive with the B1102 code active, as it signifies a fault in the airbag system that could affect its operation in the event of an accident.

5. How can I diagnose OBDII code B1102 (Airbag Battery Voltage Low)?

Diagnosing the B1102 code requires a professional OBDII scanner to retrieve the code and further testing to pinpoint the exact cause, which may involve checking the battery voltage, inspecting connections, and testing the airbag system components.

6. What are some repair tips for fixing OBDII code B1102 (Airbag Battery Voltage Low)?

Repairing the B1102 code may involve replacing the battery, repairing or replacing faulty wiring, cleaning and securing electrical connections, or replacing the airbag control module if necessary.

7. Can a DIY enthusiast fix OBDII code B1102 (Airbag Battery Voltage Low) at home?

While some basic checks like inspecting connections and testing the battery voltage can be done by DIY enthusiasts, diagnosing and repairing the B1102 code often requires specialized knowledge and tools best handled by a professional technician.

8. How much does it typically cost to repair OBDII code B1102 (Airbag Battery Voltage Low)?

The cost of repairing the B1102 code can vary depending on the underlying cause. It may range from a simple fix like tightening connections to more complex repairs involving component replacement, potentially costing several hundred dollars.

9. Will resetting the OBDII system clear the B1102 code (Airbag Battery Voltage Low)?

Resetting the OBDII system may temporarily clear the B1102 code, but if the underlying issue is not addressed, the code is likely to reappear once the system detects the fault again.

10. Is OBDII code B1102 (Airbag Battery Voltage Low) a common issue in certain vehicle makes or models?

The B1102 code can be found in various vehicle makes and models equipped with OBDII systems, particularly those with advanced airbag systems that monitor battery voltage for proper operation.