Engine-Codes.com
Engine-Codes – Generic – B3855

B3855 Code - Rollover Sensor Performance

Quick Answer

The B3855 diagnostic trouble code (DTC) relates to the rollover sensor's performance in a vehicle. Common causes include Sensor calibration issues, Wiring harness damage or corrosion, Sensor damage due to impact or environmental factors. 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 indicates Rollover Sensor Performance.
Common causes
Common causes include Sensor calibration issues, Wiring harness damage or corrosion, Sensor damage due to impact or environmental factors.
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 07, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code B3855 Description

The B3855 diagnostic trouble code (DTC) relates to the rollover sensor's performance in a vehicle. The rollover sensor is a crucial component of the vehicle's safety system, responsible for detecting a potential rollover event and triggering the deployment of the airbags and seat belt pretensioners to protect occupants in such a scenario. When the rollover sensor performance is compromised, it can lead to inaccurate or delayed activation of these safety features, posing a significant risk to the occupants in the event of a rollover.

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

Common Causes of B3855

  1. Sensor calibration issues
  2. Wiring harness damage or corrosion
  3. Sensor damage due to impact or environmental factors
  4. Faulty electronic control module
  5. Poor connection or loose wiring

Symptoms of B3855

  1. Illumination of the airbag warning light on the dashboard
  2. Inconsistent or delayed deployment of airbags in a rollover scenario
  3. Erratic behavior of seat belt pretensioners
  4. Loss of communication with the airbag system
  5. Vehicle may fail safety inspections or crash tests

How to Fix B3855

  1. Diagnostic scan: Use a diagnostic scan tool to retrieve the specific fault codes stored in the vehicle's computer system.
  2. Inspect wiring and connections: Check the wiring harness for any signs of damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test rollover sensor: Perform tests to check the functionality and calibration of the rollover sensor. Replace if necessary.
  4. Reset airbag system: Clear the fault codes and reset the airbag system to ensure proper operation.
  5. Test drive: Take the vehicle for a test drive to verify that the issue has been resolved and that the airbag system functions correctly.

Cost to Fix B3855

The cost of repairing a rollover sensor performance issue can vary depending on the specific cause of the problem and the extent of repairs needed. In general, the cost of replacing a rollover sensor can range from $200 to $500, including parts and labor. Additional costs may apply if wiring repairs or electronic control module replacement is necessary. It is important to note that labor rates at auto repair shops can vary, and additional diagnostic time may be required to pinpoint the exact cause of the issue. It is advisable to consult with a qualified mechanic or dealership for a more accurate cost estimate based on the vehicle's make and model.

Need more information about the B3855 code?

Need more information on how to fix the B3855 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3855 code diagnosed by a professional: Find a repair shop in your area

Code B3855 Information for Specific Makes

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 Code

1. What does the OBDII code B3855 mean?

B3855 indicates an issue with the performance of the rollover sensor, which monitors a vehicle's tilt angle to detect potential rollovers.

2. What are the common symptoms of the B3855 code?

Symptoms may include an illuminated airbag or check engine light, deactivated safety systems, and possible error messages on the dashboard.

3. What causes the B3855 code to appear?

Common causes include a faulty rollover sensor, damaged wiring or connectors, water intrusion, or issues with the electronic control module (ECM).

4. Is it safe to drive with the B3855 code active?

Driving may be less safe since the vehicle’s rollover detection and related safety systems, such as airbags, might not function properly.

5. How can I diagnose the B3855 code?

Diagnose the issue by scanning the vehicle with an OBDII scanner, inspecting the rollover sensor, checking wiring and connectors, and testing the related circuits.

6. Can a faulty rollover sensor be repaired, or does it need replacement?

In most cases, a faulty rollover sensor will need to be replaced, as internal components are not serviceable.

7. How much does it cost to fix the B3855 code?

Repair costs vary but typically range from $150 to $500, depending on whether the sensor, wiring, or control module needs repair or replacement.

8. What tools are required to troubleshoot the B3855 code?

An OBDII scanner, a multimeter for testing electrical connections, and possibly manufacturer-specific diagnostic tools are needed.

9. Can extreme weather cause the B3855 code to trigger?

Yes, extreme conditions like excessive heat, cold, or water exposure can damage the sensor or its wiring, leading to this code.

10. Does the B3855 code reset automatically after repairs?

The code may not reset automatically; you may need to clear it using an OBDII scanner after completing the necessary repairs.

Discuss the causes and fixes for B3855 OBDII Code

Submit a New Comment

Code B3855 comments

No comments found for this page.