OBD-II trouble code
B00BA: Driver Seat Occupant Position Sensor "D" (Subfault)
The airbag/SRS control module detected a fault with driver-seat occupant position sensor D — one of the sensors that judge where the driver is positioned for restraint decisions. Airbag operation may be affected, so this needs prompt professional attention.
Quick facts
- System
- Body
- Category
- Airbag / SRS Restraints
- Severity
- High severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $100 – $900
- DIY difficulty
- Shop recommended
What does B00BA mean?
B00BA is a body (B) code stored by the airbag/SRS control module — often called the Restraints Control Module (RCM) or SDM (Sensing and Diagnostic Module). It is a hexadecimal code — the characters after B00 are the letters B and A, not numbers — and its SAE-generic definition is 'Driver Seat Occupant Position Sensor "D".' Occupant position sensing judges where an occupant actually is within the seat — for example whether the driver is leaning far forward or is out of position — so the restraint system can tailor how the airbag deploys. Where a seat uses several such sensors or channels, they are lettered A, B, C, D and so on; the 'D' identifies the fourth sensor or channel in that driver-seat set.
The module sets B00BA when driver-seat occupant position sensor D reports invalid data or its circuit falls out of specification — an open or short in the sensor wiring, a corroded or backed-out connector under the seat, a failed sensor, a mis-calibrated or un-zeroed system, or a faulty classification/position module. A symptom byte appended to the code narrows down the exact fault. Because the sensor and its wiring live in or under the driver's seat, connectors disturbed by seat travel, floor moisture, spilled liquids, and aftermarket seat-cover or seat-heater work are common trouble spots, and many systems require a zero/recalibration procedure after any seat or sensor service. Confirm the exact configuration against your make's service data, as occupant-position designs vary widely and not every vehicle populates every lettered sensor.
This is a supplemental restraint fault, not a driveability fault: the vehicle drives normally, but restraint behavior tied to driver position sensing may not perform as designed, and airbag circuits carry a small risk of unintended deployment when mishandled. SRS diagnosis and repair should be performed by a qualified technician who can safely disable the system and run any required calibration.
Common causes
- Corroded, backed-out, or loose connector under the driver's seat
- Damaged wiring in the seat harness from seat travel or floor moisture
- Failed driver-seat occupant position sensor D
- System out of calibration or never zeroed after seat/sensor service
- Faulty occupant classification/position module
- Aftermarket seat covers, heaters, or heavy items interfering with the sensor
Symptoms
- Airbag / SRS warning light on
- Occupant indicator or advanced-restraint behavior working incorrectly
- Stored B00BA fault (often with a symptom byte) in the restraints module
- No effect on engine or driving performance
Diagnostic steps
- 1.Use a scan tool that can access the airbag/SRS module and record B00BA with its full symptom byte and any companion occupant-detection codes.
- 2.Confirm no aftermarket seat cover, seat heater, or heavy item is interfering with the driver's seat, and remove anything unusual before testing.
- 3.Confirm the exact configuration for the make and model, since occupant-position sensing and its lettered channels vary.
- 4.With the SRS safely disabled per the service procedure, inspect the under-seat connector and seat harness for corrosion, moisture, or backed-out terminals.
- 5.Check occupant position sensor D's circuit against specification to separate a wiring/connector fault from a failed sensor or module.
- 6.If companion occupant-position or classification codes are present, focus on a shared connector, power, or ground rather than several independent failures.
- 7.Repair the wiring/connector or replace the sensor or module, run the make-specific zero/recalibration, then clear codes and confirm the SRS light stays off.
Repair cost
$100 – $900
A connector repair or a recalibration can be inexpensive, while a failed occupant position sensor or classification module is costlier and often needs calibration. SRS diagnostic time typically runs $100-$200; sensor or module replacement with the required calibration commonly falls in the several-hundred-dollar range. SRS work should be done by a qualified technician.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with airbag / srs crash sensor replacement preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
Leave this one to a qualified shop. It typically involves emissions-critical components, refrigerant handling, or other work that requires manufacturer-grade tooling, training, or certification. DIY attempts often produce a more expensive problem than the original code.