B3855 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 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 Description
What are the Possible Causes of the DTC B3855?
- 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?
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 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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Need Help with the Code?
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Information for Specific Makes
- B3855 Buick — Rollover Sensor Performance
- B3855 Cadillac — Rollover Sensor Performance
- B3855 Chevrolet — Rollover Sensor Performance
- B3855 GMC — Rollover Sensor Performance
- B3855 Hummer — Rollover Sensor Performance
- B3855 Pontiac — Rollover Sensor Performance
- B3855 Saturn — Rollover Sensor Performance
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 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.
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