What Does B0054 Mean?
This code indicates that the Body Control Module (BCM) has detected a fault or subfault condition with the center seat seatbelt buckle sensor in the second row of seats. The sensor is designed to monitor whether the seatbelt is buckled and communicate this status to the BCM for occupant detection and airbag deployment logic. A subfault typically indicates an intermittent signal, abnormal resistance, or partial circuit failure rather than a complete open or short circuit.
Common Causes
45%
Faulty or corroded seatbelt buckle sensor/switch in the center second row position
30%
Damaged, chafed, or corroded wiring harness or connector between the buckle sensor and BCM
15%
Poor ground connection or high resistance in the sensor circuit ground path
10%
BCM internal fault or software calibration issue affecting sensor input processing
Diagnostic Steps
1
Step 1: Visually inspect the center second row seatbelt buckle assembly for physical damage, foreign debris, or liquid contamination that may affect sensor operation. Check buckle mechanism for proper engagement and release.
2
Step 2: Disconnect the seatbelt buckle sensor connector and inspect terminals for corrosion, bent pins, or moisture. Clean connector terminals with electrical contact cleaner if contamination is present.
3
Step 3: Using a digital multimeter, measure resistance across the buckle sensor terminals in both buckled and unbuckled positions. Typical values are 0-5 ohms when buckled and open circuit (infinite resistance) when unbuckled. Compare readings to manufacturer specifications.
4
Step 4: Check continuity and resistance of the wiring harness from the buckle sensor connector to the BCM connector. Look for values below 1 ohm per circuit and inspect for chafing points under seats and along seat tracks.
5
Step 5: Verify ground circuit integrity by measuring voltage drop between sensor ground and battery negative with sensor connected and BCM powered on. Voltage drop should be less than 0.1V.
6
Step 6: If all circuits test normal, substitute a known-good seatbelt buckle sensor assembly and retest. Clear codes and perform a test drive with buckle engaged and disengaged to verify repair. If fault returns, suspect BCM internal issue requiring replacement or reprogramming.
Estimated Repair Cost
$100 - $400
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) has detected a fault or subfault condition with the center seat seatbelt buckle sensor in the second row of seats. The sensor is designed to monitor whether the seatbelt is buckled and communicate this status to the BCM for occupant detection an...
The most common cause of B0054 (Second RowCenter Seatbelt Sensor (Subfault)) is: Faulty or corroded seatbelt buckle sensor/switch in the center second row position
Typical repair costs for B0054 range from $100 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is safe to drive, but the seatbelt warning system may not function correctly for the second row center position, and airbag deployment logic may be affected for that seating position. Repair should be completed promptly to ensure proper occupant protection system operation and to avoid potential airbag deployment issues in a collision.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B0054 to identify the root cause.
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Quick Info
Category
Body
System
Occupant Restraint System
Difficulty
Type
Generic (SAE)
Recommended Tools
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