What Does B0057 Mean?
This code indicates that the Body Control Module (BCM) has detected a malfunction or abnormal signal from the seatbelt buckle sensor located in the center position of the third row seating. The subfault designation suggests an intermittent connection issue, partial circuit failure, or sensor output that falls outside expected parameters. This sensor monitors whether the center third-row seatbelt is buckled and communicates this status to the occupant restraint system.
Common Causes
45%
Faulty or damaged seatbelt buckle sensor assembly with internal switch failure
30%
Corroded, loose, or damaged wiring connector at the seatbelt buckle sensor
15%
Open or short circuit in the wiring harness between BCM and seatbelt sensor
10%
Body Control Module internal fault or software corruption
Diagnostic Steps
1
Step 1: Perform a visual inspection of the third-row center seatbelt buckle assembly for physical damage, debris, liquid contamination, or visible corrosion on the connector terminals
2
Step 2: Disconnect the seatbelt buckle sensor connector and inspect both male and female terminals for corrosion, bent pins, or moisture. Clean with electrical contact cleaner if contamination is present
3
Step 3: Using a digital multimeter, test the seatbelt buckle sensor resistance between signal and ground terminals with buckle unbuckled (should show open circuit or high resistance, typically 10k+ ohms) and buckled (should show closed circuit or low resistance, typically <5 ohms). Compare readings to manufacturer specifications
4
Step 4: With the sensor disconnected, check for continuity and shorts to ground/power along the wiring harness from the sensor connector back to the BCM connector. Check for proper voltage supply (typically 5V reference) from BCM at the sensor connector with ignition on
5
Step 5: If all wiring and sensor tests pass, reconnect all components, clear codes, and perform a buckle/unbuckle cycle test while monitoring live data to verify proper signal transition. If fault returns immediately, suspect BCM internal fault or software issue requiring professional scan tool for module testing
Estimated Repair Cost
$75 - $350
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) has detected a malfunction or abnormal signal from the seatbelt buckle sensor located in the center position of the third row seating. The subfault designation suggests an intermittent connection issue, partial circuit failure, or sensor output ...
The most common cause of B0057 (Third Row Center Seatbelt Sensor (Subfault)) is: Faulty or damaged seatbelt buckle sensor assembly with internal switch failure
Typical repair costs for B0057 range from $75 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive, but the seatbelt warning system for the third-row center position may not function properly, potentially preventing detection of an unbuckled occupant. This could affect airbag deployment strategy and compromise occupant protection in that seating position. Repair should be completed promptly, especially if this seat is regularly occupied.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B0057 to identify the root cause.
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Quick Info
Category
Body
System
Occupant Restraint System / Safety Belt System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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