B3856 GMC Code - Discard Rollover Sensor
Quick Answer
The inflatable restraint vehicle Rollover Sensor (ROS) utilizes the battery power supply and a bidirectional interface circuit. Common causes include Faulty Rollover Sensor, Rollover Sensor harness is open or shorted, Rollover Sensor 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
- B3856 GMC indicates Discard Rollover Sensor.
- Common causes
- Common causes include Faulty Rollover Sensor, Rollover Sensor harness is open or shorted, Rollover Sensor 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.
Code B3856 GMC Description
What are the Possible Causes of the DTC B3856 GMC?
- Faulty Rollover Sensor
- Rollover Sensor harness is open or shorted
- Rollover Sensor circuit poor electrical connection
- Faulty Sensing and Diagnostic Module (SDM)
How to Fix the DTC B3856 GMC?
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 B3856 GMC 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.
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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.
Frequently Asked Questions about B3856 GMC Code
1. What are the common symptoms of OBDII code B3856 GMC (Discard Rollover Sensor)?
The common symptoms of code B3856 include the airbag warning light illuminating on the dashboard and potential issues with the vehicle's airbag system.
2. What does the OBDII code B3856 GMC indicate?
OBDII code B3856 indicates a fault with the Discard Rollover Sensor in the airbag system of a GMC vehicle.
3. What are the possible causes of OBDII code B3856 GMC?
Possible causes of code B3856 include a faulty rollover sensor, damaged wiring or connectors in the airbag system, or a malfunction in the airbag control module.
4. How can I diagnose the issue related to OBDII code B3856 GMC?
Diagnosing the issue involves using a diagnostic scanner to retrieve the specific fault code, inspecting the rollover sensor and its connections for any visible damage, and testing the sensor's functionality according to the manufacturer's guidelines.
5. Can OBDII code B3856 GMC be repaired at home?
While some basic inspections and checks can be done at home, repairing OBDII code B3856 usually requires specialized tools and expertise. It is recommended to seek professional help for accurate diagnosis and repair.
6. Is it safe to drive with OBDII code B3856 GMC active?
It is not recommended to drive the vehicle with an active B3856 code, as it indicates a potential issue with the airbag system that may affect its functionality in the event of a collision.
7. How much does it typically cost to repair OBDII code B3856 GMC?
The cost of repairing OBDII code B3856 can vary depending on the specific cause of the issue, the extent of the damage, and the labor rates of the repair shop. It is advisable to obtain quotes from different service centers.
8. Can resetting the OBDII system clear the B3856 code?
Resetting the OBDII system may temporarily clear the B3856 code, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem.
9. Are there any recalls or technical service bulletins related to OBDII code B3856 GMC?
It is advisable to check with the manufacturer or a certified GMC dealership to inquire about any recalls or technical service bulletins related to OBDII code B3856 in specific GMC models.
10. How can I prevent OBDII code B3856 GMC from recurring in the future?
Regular maintenance of the airbag system, including checking for loose connections, ensuring proper sensor functionality, and addressing any warning lights promptly, can help prevent the recurrence of OBDII code B3856 in the future.
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