What Does B00B8 Mean?
This code indicates the Body Control Module (BCM) has detected a fault in the driver seat occupant position sensor circuit B, which is part of the seat occupancy detection system. This sensor is typically used for advanced safety features like airbag deployment optimization, seatbelt reminders, and seat position memory systems. The 'subfault' designation suggests an intermittent signal, implausible reading, or specific circuit condition within the secondary position sensor array.
Common Causes
45%
Faulty or damaged occupant position sensor B mat or pressure sensor embedded in seat cushion
25%
Corroded, damaged, or loose electrical connector at sensor B or BCM interface
20%
Damaged wiring harness or chafed wires between sensor B and BCM due to seat movement
10%
Failed Body Control Module or internal sensor processing circuit malfunction
Diagnostic Steps
1
Step 1: Perform visual inspection of driver seat area, checking for physical damage to seat cushion, liquid spills, or obvious wiring damage. Remove seat covers if necessary to access sensor mat and connector locations.
2
Step 2: Inspect electrical connectors at occupant position sensor B (typically under seat) and BCM for corrosion, bent pins, moisture intrusion, or loose connections. Clean and reconnect all connections, applying dielectric grease.
3
Step 3: Using a digital multimeter, check voltage supply and ground circuits to sensor B with ignition on (typically 5V reference). Verify continuity of signal wires between sensor connector and BCM connector according to wiring diagram specifications.
4
Step 4: Monitor live data stream for sensor B output values while applying graduated pressure to different seat cushion areas. Compare readings to sensor A and manufacturer specifications to identify dead zones or erratic signals.
5
Step 5: Perform resistance test on sensor B mat (if accessible) according to service manual specifications, typically checking multiple zones within the sensor array for proper resistance values (commonly 1-10k ohms depending on pressure).
6
Step 6: If all circuits test within specifications, replace occupant position sensor B mat assembly. Clear codes, perform seat occupancy system recalibration procedure per manufacturer requirements, and verify repair with test drive and multiple seat entry/exit cycles.
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a fault in the driver seat occupant position sensor circuit B, which is part of the seat occupancy detection system. This sensor is typically used for advanced safety features like airbag deployment optimization, seatbelt reminders, and ...
The most common cause of B00B8 (Driver Seat Occupant Position Sensor "B" (Subfault)) is: Faulty or damaged occupant position sensor B mat or pressure sensor embedded in seat cushion
Typical repair costs for B00B8 range from $150 to $800, 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 and seatbelt reminder systems may not function optimally for the driver seat. Repair should be completed promptly as this affects critical safety system operation and may cause airbag warning light illumination.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B00B8 to identify the root cause.
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Quick Info
Category
Body
System
Body Control / Occupant Safety System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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