B3855 Cadillac 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 Cadillac 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 Cadillac Description
What are the Possible Causes of the DTC B3855 Cadillac?
- 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 Cadillac?
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 Cadillac 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 Cadillac Code
1. What does OBDII code B3855 mean on a Cadillac?
B3855 indicates an issue with the rollover sensor's performance, which monitors the vehicle's tilt or roll angle to activate safety systems during a rollover event.
2. What are the common symptoms of code B3855 in a Cadillac?
Symptoms may include an airbag warning light on the dashboard, failure of the rollover protection system, or stored diagnostic trouble codes (DTCs) in the vehicle's computer.
3. What causes the B3855 code to appear?
Common causes include a faulty rollover sensor, damaged wiring or connectors, software issues in the airbag control module, or physical damage to the sensor due to an accident or impact.
4. Can I drive my Cadillac with the B3855 code active?
While the vehicle may still be drivable, the safety systems related to rollover protection may not function properly, which could pose a risk in the event of an accident.
5. How do I diagnose the B3855 code in my Cadillac?
Begin by scanning the vehicle's OBDII system with a diagnostic scanner, inspecting the rollover sensor for damage, and checking the wiring and connectors for continuity or corrosion.
6. How do I fix the B3855 code on a Cadillac?
Repairs may involve replacing the rollover sensor, repairing or replacing damaged wiring, or updating the airbag control module software if a glitch is detected.
7. Where is the rollover sensor located in a Cadillac?
The rollover sensor is typically located near the vehicle's center of gravity, often under the center console or near the airbag control module.
8. How much does it cost to repair the B3855 code on a Cadillac?
Repair costs can vary, but replacing the rollover sensor typically ranges from $200 to $500, including parts and labor. Wiring repairs or software updates may be less expensive.
9. Can a weak battery cause the B3855 code?
Yes, a weak or failing battery can affect the electrical system and potentially trigger codes like B3855 due to insufficient power to the rollover sensor.
10. Do I need professional help to fix the B3855 code?
While basic troubleshooting like checking connections can be done at home, diagnosing and repairing rollover sensor issues often requires specialized tools and expertise, so professional assistance is recommended.
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