B3855 Hummer Code - Rollover Sensor Performance
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
- B3855 Hummer indicates Rollover Sensor Performance.
- 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 B3855 Hummer Description
What are the Possible Causes of the DTC B3855 Hummer?
- 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 B3855 Hummer?
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 B3855 Hummer 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 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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