B3857 Code - Incorrect Rollover Sensor Installed
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
- B3857 indicates Incorrect Rollover Sensor Installed.
- 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 B3857 Description
What are the Possible Causes of the DTC B3857?
- 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 B3857?
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 B3857 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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Information for Specific Makes
- B3857 Buick — Headlamp High Beam Signal Circuit
- B3857 Cadillac — Headlamp High Beam Signal Circuit
- B3857 Chevrolet — Incorrect Rollover Sensor Installed
- B3857 GMC — Incorrect Rollover Sensor Installed
- B3857 Hummer — Incorrect Rollover Sensor Installed
- B3857 Pontiac — Incorrect Rollover Sensor Installed
- B3857 Saturn — Incorrect Rollover Sensor Installed
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 B3857 Code
1. What are the common symptoms of OBDII code B3857 (Incorrect Rollover Sensor Installed)?
- Common symptoms include the airbag warning light being illuminated on the dashboard and potential issues with the vehicle's airbag system.
2. What can cause OBDII code B3857 to trigger?
- OBDII code B3857 is triggered when the rollover sensor installed in the vehicle does not match the specifications required by the vehicle's system.
3. How serious is the OBDII code B3857 (Incorrect Rollover Sensor Installed)?
- This code is considered serious as it indicates a potential malfunction in the vehicle's safety system, particularly the airbag deployment in the event of a rollover.
4. What should I do if I encounter OBDII code B3857?
- It is recommended to have the vehicle inspected by a qualified mechanic to diagnose the issue with the rollover sensor and ensure proper functioning of the airbag system.
5. Can I continue driving my vehicle with OBDII code B3857 present?
- It is not recommended to continue driving the vehicle with this code active, as it may compromise the effectiveness of the airbag system in the event of an accident.
6. How is OBDII code B3857 diagnosed?
- Diagnosis typically involves using a diagnostic scanner to read the code, followed by a thorough inspection of the rollover sensor and related components.
7. What is the typical repair for OBDII code B3857?
- The typical repair involves replacing the incorrect rollover sensor with the appropriate one specified for the vehicle.
8. Can I reset OBDII code B3857 without fixing the underlying issue?
- While you can clear the code with a diagnostic tool, it is crucial to address the underlying problem to ensure the proper functioning of the airbag system.
9. Are there any DIY repair tips for OBDII code B3857?
- DIY repair is not recommended for this code, as it involves working with critical safety components. It is best to have a professional mechanic handle the repair.
10. How can I prevent OBDII code B3857 from occurring in the future?
- To prevent this code from occurring, ensure that any replacement sensors or components installed in the vehicle meet the manufacturer's specifications for compatibility and functionality.
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