What Does B00B2 Mean?
This code indicates that the Body Control Module (BCM) or Restraint Control Module has detected a fault in the driver seat occupant classification sensor circuit 'C', which is part of the occupant detection system. This system determines whether the driver's seat is occupied and classifies the occupant's weight/position to properly deploy airbags and manage safety systems. The 'subfault' designation suggests a specific internal sensor issue or calibration problem within the occupant classification mat or sensor array.
Common Causes
45%
Faulty or damaged occupant classification sensor mat embedded in driver seat cushion
30%
Damaged, corroded, or disconnected wiring harness connector under driver seat
15%
Water intrusion or moisture contamination in seat sensor or connector
10%
Failed Restraint Control Module or Body Control Module processing error
Diagnostic Steps
1
Step 1: Perform visual inspection under driver seat for damaged wiring, disconnected connectors, or signs of water intrusion. Check all connectors to occupant classification sensor for corrosion, bent pins, or loose connections.
2
Step 2: Using a digital multimeter, check continuity and resistance values of the occupant classification sensor circuit from connector to sensor mat. Compare readings to manufacturer specifications (typically 200-2000 ohms depending on load).
3
Step 3: Remove driver seat bottom cushion to inspect occupant classification sensor mat for physical damage, tears, pressure points, or foreign objects that may affect sensor readings.
4
Step 4: Clear the code and monitor live data from the occupant classification system using scan tool while applying various weights to driver seat to verify sensor response and calibration.
5
Step 5: If sensor and wiring test normal, perform functional test of Restraint Control Module and check for software updates or reprogramming requirements for occupant classification system.
6
Step 6: After repairs, perform system calibration procedure (if required by manufacturer) and verify airbag warning light extinguishes and no codes return.
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) or Restraint Control Module has detected a fault in the driver seat occupant classification sensor circuit 'C', which is part of the occupant detection system. This system determines whether the driver's seat is occupied and classifies the occup...
The most common cause of B00B2 (Driver Seat Occupant Classification Sensor "C" (Subfault)) is: Faulty or damaged occupant classification sensor mat embedded in driver seat cushion
Typical repair costs for B00B2 range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is generally safe to drive, but airbag deployment may be compromised or incorrect for driver position. The airbag warning light will likely be illuminated, and driver airbag may default to full deployment regardless of occupant classification, which could affect safety in a collision. Repair should be completed promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B00B2 to identify the root cause.
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Quick Info
Category
Body
System
Occupant Safety Restraint System / Airbag System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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