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Engine-Codes – Hummer – B3855 Hummer

B3855 Hummer Code - Rollover Sensor Performance

Quick Answer

The B3855 code for a Hummer indicates an issue with the rollover sensor performance. Common causes include Faulty rollover sensor, Wiring or connection issues in the sensor system, Impact or damage to the sensor. 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 Hummer indicates Rollover Sensor Performance.
Common causes
Common causes include Faulty rollover sensor, Wiring or connection issues in the sensor system, Impact or damage to the sensor.
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 09, 2024
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Code B3855 Hummer Description

The B3855 code for a Hummer indicates an issue with the rollover sensor performance. The rollover sensor is a crucial component of the vehicle's safety system, designed to detect when the vehicle is at risk of rolling over and deploying the necessary safety measures to protect the occupants. When this sensor malfunctions or fails to perform correctly, it can have serious implications for the vehicle's safety and performance.

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

Common Causes of B3855 Hummer

  1. Faulty rollover sensor
  2. Wiring or connection issues in the sensor system
  3. Impact or damage to the sensor
  4. Corrosion or moisture ingress affecting the sensor
  5. Software or calibration issues with the sensor system

Symptoms of B3855 Hummer

  1. Illumination of the airbag warning light on the dashboard
  2. Stability control system not functioning properly
  3. Inconsistent or erratic deployment of airbags
  4. Increased risk of rollovers in certain driving conditions

How to Fix B3855 Hummer

  1. Diagnose the issue by using a diagnostic scanner to retrieve the specific fault code and identify the underlying cause of the problem.
  2. Inspect the rollover sensor and its wiring for any visible damage, corrosion, or loose connections. Repair or replace as needed.
  3. Check the sensor's mounting and ensure it is securely in place. Adjust or replace the mounting if necessary.
  4. Clear the fault code from the vehicle's system using the diagnostic scanner and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, consult a professional technician for further troubleshooting and repairs.

Cost to Fix B3855 Hummer

The cost of repairing a rollover sensor performance issue can vary depending on the extent of the problem and the specific repairs needed. In general, replacing a faulty rollover sensor can cost between $200 and $500, including parts and labor. Additional costs may apply if there are wiring or connection issues that need to be addressed. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to get quotes from multiple shops to compare prices.

Need more information about the B3855 Hummer code?

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

Need Help with the Code?

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

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 Hummer Code

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

The common symptoms include the airbag warning light staying illuminated, potential loss of stability control, and possible deployment of safety systems.

2. What can cause OBDII code B3855 to trigger in a Hummer?

The code can be triggered by a malfunctioning rollover sensor, damaged wiring or connectors, or issues with the airbag control module.

3. How can I diagnose the cause of OBDII code B3855 in my Hummer?

Diagnosing the issue involves using a diagnostic scan tool to retrieve the specific fault code, inspecting the rollover sensor and its connections, and testing the wiring for any faults or damage.

4. What are the potential dangers of driving with OBDII code B3855 active in a Hummer?

Driving with the code active can compromise the proper functioning of safety systems such as the airbags and stability control, increasing the risk of injury in the event of an accident.

5. Can I reset OBDII code B3855 in my Hummer to see if it reoccurs?

While you can reset the code, it is important to diagnose and fix the underlying issue first to prevent the code from reoccurring and to ensure the safety systems are functioning properly.

6. How much does it typically cost to repair OBDII code B3855 in a Hummer?

The cost of repairing the code can vary depending on the root cause of the issue. It may range from a simple sensor replacement to more complex wiring repairs, so it's best to have a professional diagnose the problem first.

7. Is it safe to continue driving my Hummer with OBDII code B3855 if the airbag warning light is on?

It is not recommended to drive the vehicle with the airbag warning light on, as it indicates a potential issue with the safety systems. It's best to have the problem diagnosed and repaired as soon as possible.

8. Can a DIY enthusiast without much experience fix OBDII code B3855 in a Hummer?

While some aspects of diagnosing and repairing the code may be within reach of a DIY enthusiast, dealing with safety systems like airbags is best left to professionals due to the complexity and importance of proper repair.

9. Are there any preventive measures I can take to avoid OBDII code B3855 in my Hummer?

Regularly inspecting the vehicle's safety systems, keeping an eye out for warning lights, and addressing any issues promptly can help prevent the onset of codes like B3855 related to safety system malfunctions.

10. Will OBDII code B3855 cause my Hummer to fail an emissions test?

OBDII code B3855 is related to the vehicle's safety systems and is not directly linked to emissions. However, having unresolved codes can indicate a larger issue with the vehicle's overall health, which may impact its ability to pass an emissions test.

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