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B3855 Buick Code - Rollover Sensor Performance

Quick Answer

The B3855 diagnostic trouble code (DTC) for Buick vehicles indicates a problem with the rollover sensor's performance. Common causes include Damage to the rollover sensor due to impact or corrosion, Faulty wiring or poor electrical connections, Issues with the vehicle's electrical system. 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
B3855 Buick indicates Rollover Sensor Performance.
Common causes
Common causes include Damage to the rollover sensor due to impact or corrosion, Faulty wiring or poor electrical connections, Issues with the vehicle's electrical system.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
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Code B3855 Buick Description

The B3855 diagnostic trouble code (DTC) for Buick vehicles indicates a problem with the rollover sensor's performance. The rollover sensor is a crucial component of the vehicle's safety system, designed to detect if the vehicle is at risk of rolling over and trigger appropriate safety measures, such as deploying airbags or activating seatbelt pretensioners. When this sensor malfunctions or fails to perform as intended, it can compromise the vehicle's safety features and put occupants at risk in the event of a rollover accident.

OBDII Code B3855 Buick - Rollover Sensor Performance
B3855 Buick Code - Rollover Sensor Performance

Common Causes of B3855 Buick

  1. Damage to the rollover sensor due to impact or corrosion
  2. Faulty wiring or poor electrical connections
  3. Issues with the vehicle's electrical system
  4. Software glitches or malfunctions in the sensor module
  5. Environmental factors such as moisture or extreme temperatures affecting sensor performance

Symptoms of B3855 Buick

  1. Illumination of the airbag warning light on the dashboard
  2. Inconsistent or erratic deployment of airbags
  3. Loss of stability control or traction control functionality
  4. Vehicle may not pass a safety inspection
  5. Diagnostic trouble codes related to the rollover sensor or airbag system

How to Fix B3855 Buick

  1. Begin by conducting a thorough inspection of the rollover sensor and its wiring to identify any visible damage or issues.
  2. Test the sensor's functionality using a diagnostic scan tool to pinpoint the specific problem.
  3. Replace the rollover sensor if it is found to be faulty or damaged beyond repair.
  4. Repair any damaged wiring or connections related to the sensor to ensure proper functionality.
  5. Clear the DTC from the vehicle's computer system and perform a test drive to verify that the issue has been resolved.

Cost to Fix B3855 Buick

The cost of repairing a rollover sensor performance issue can vary depending on the extent of the problem, the specific components that need to be replaced, and the labor rates at the auto repair shop. On average, the repair cost for this issue can range from $200 to $500, including parts and labor. It's important to note that diagnostic time and labor rates can vary significantly, so it's advisable to check with local repair shops for a more accurate estimate based on your vehicle's make and model. Additionally, factors such as location, dealership rates, and the complexity of the repair can also impact the overall cost.

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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.

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.

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