B3855 GMC 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 GMC 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 GMC Description
What are the Possible Causes of the DTC B3855 GMC?
- 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 GMC?
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 GMC 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 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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