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Engine-Codes – GMC – B3855 GMC

B3855 GMC Code - Rollover Sensor Performance

Quick Answer

The B3855 GMC code indicates a problem with the rollover sensor's performance in the vehicle. Common causes include Faulty rollover sensor, Wiring issues in the sensor circuit, Sensor calibration out of range. 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 GMC indicates Rollover Sensor Performance.
Common causes
Common causes include Faulty rollover sensor, Wiring issues in the sensor circuit, Sensor calibration out of range.
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 18, 2024
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Code B3855 GMC Description

The B3855 GMC code indicates a problem with the rollover sensor's performance in the vehicle. The rollover sensor is a crucial component of the vehicle's safety system, designed to detect if the vehicle is in danger of rolling over and trigger the deployment of the airbags and seatbelt pretensioners to protect the occupants. When this sensor malfunctions, it can compromise the vehicle's safety features and put the occupants at risk in the event of a rollover accident.

OBDII Code B3855 GMC - Rollover Sensor Performance
B3855 GMC Code - Rollover Sensor Performance

Common Causes of B3855 GMC

  1. Faulty rollover sensor
  2. Wiring issues in the sensor circuit
  3. Sensor calibration out of range
  4. Impact or damage to the sensor from a previous accident
  5. Corrosion or moisture damage to the sensor components

Symptoms of B3855 GMC

  1. Airbag warning light illuminated on the dashboard
  2. Seatbelt warning light illuminated on the dashboard
  3. Inconsistent deployment of airbags in a rollover situation
  4. False alarms triggering airbag deployment during normal driving

How to Fix B3855 GMC

  1. Begin by diagnosing the specific cause of the B3855 code using a diagnostic scanner to pinpoint the issue with the rollover sensor.
  2. Inspect the wiring and connections related to the rollover sensor for any signs of damage, corrosion, or loose connections. Repair or replace any damaged wiring.
  3. Check the sensor itself for proper calibration and functionality. Replace the sensor if it is found to be faulty.
  4. Clear the B3855 code from the vehicle's computer system after completing the repairs.
  5. Test the vehicle to ensure that the rollover sensor is now functioning correctly and that the warning lights are no longer illuminated.

Cost to Fix B3855 GMC

The cost of repairing a rollover sensor performance issue can vary depending on the specific cause of the problem and the vehicle's make and model. On average, the cost of parts for a new rollover sensor can range from $100 to $300, while the labor costs for diagnosis and repair can range from $150 to $400. Overall, the total cost of repairing a B3855 code related to rollover sensor performance can range from $250 to $700. It is recommended to consult with a qualified mechanic or auto repair shop to get an accurate estimate based on your vehicle's specific needs. Labor rates at auto repair shops typically range from $80 to $150 per hour, but may vary based on location and other factors.

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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.

Frequently Asked Questions about B3855 GMC Code

1. What are the common symptoms of OBDII code B3855 GMC (Rollover Sensor Performance)?

- Common symptoms include the illumination of the airbag warning light on the dashboard and potential issues with the vehicle's airbag system.

2. What causes OBDII code B3855 GMC to be triggered?

- This code is typically triggered when the rollover sensor in the vehicle's airbag system detects a performance issue or malfunction.

3. How serious is OBDII code B3855 GMC (Rollover Sensor Performance)?

- This code indicates a potential problem with the vehicle's airbag system, which can affect its ability to deploy in the event of a rollover accident. It is important to address this issue promptly.

4. Can OBDII code B3855 GMC be cleared/reset, or does it require repair?

- Clearing the code may temporarily turn off the warning light, but it is important to diagnose and repair the underlying issue to ensure the proper functioning of the airbag system.

5. What are some DIY repair tips for addressing OBDII code B3855 GMC?

- DIY repair is not recommended for this code, as it involves the airbag system, which is a critical safety component of the vehicle. It is best to have a qualified technician diagnose and repair the issue.

6. How much does it typically cost to repair OBDII code B3855 GMC?

- The cost of repairing this code can vary depending on the exact cause of the issue and the labor rates in your area. It is recommended to obtain a few quotes from reputable repair shops.

7. Can driving with OBDII code B3855 GMC pose any risks?

- Driving with this code present may compromise the functionality of the airbag system, increasing the risk of injury in the event of a rollover accident. It is best to have the issue addressed as soon as possible.

8. Is OBDII code B3855 GMC specific to certain GMC models?

- This code is specific to GMC vehicles and is related to the rollover sensor performance in the airbag system of certain GMC models.

9. How can a mechanic diagnose the cause of OBDII code B3855 GMC?

- A mechanic can use a scan tool to read the code and perform additional diagnostics on the airbag system to pinpoint the exact cause of the rollover sensor performance issue.

10. Are there any recalls or technical service bulletins related to OBDII code B3855 GMC?

- It is recommended to check with your local GMC dealership or visit the National Highway Traffic Safety Administration (NHTSA) website to see if there are any recalls or technical service bulletins related to this OBDII code.

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