Engine-Codes - Hummer - B3856 HUMMER

B3856 HUMMER Code - Discard Rollover Sensor

- Code Popularity: 634 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the B3856 HUMMER Code?

  • 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 B3856 HUMMER Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|What is the cost to diagnose the B3856 HUMMER code?

Labor: 1.0

The cost to diagnose the B3856 HUMMER code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

Does your car have Safety Recalls? → Check here

|What are B3856 HUMMER code possible symptoms?

  • Air Bag Warning Light ON

|What Does the B3856 HUMMER Code Mean?

The inflatable restraint vehicle Rollover Sensor (ROS) utilizes the battery power supply and a bidirectional interface circuit. The ROS modulates current on the interface to send ID, State of Health, and deployment commands to the inflatable restraint Sensing and Diagnostic Module (SDM). When the ignition is turned on the ROS responds by performing internal diagnostics and sending an ID to the SDM. The ROS continually communicates status messages to the SDM, which determines if a fault is present in the ROS circuit. If the fault is present, the SDM will set a Diagnostic Trouble Code (DTC).

Discard Rollover Sensor

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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.