What Does B0084 Mean?
This code indicates a fault in the second row center seatbelt load limiter deployment control circuit. The restraint control module has detected an abnormal condition in the load limiter system, which is designed to allow controlled seatbelt webbing release during a collision to reduce chest injury. This subfault designation suggests an electrical or communication issue rather than actual deployment.
Safety Warning
This is a critical safety system fault that may prevent proper seatbelt load limiting during a collision, potentially increasing injury risk to the second row center occupant. The vehicle should be repaired immediately as the restraint system may not function as designed in a crash. Do not allow passengers in the second row center position until repaired.
Common Causes
35%
Damaged or corroded wiring harness/connectors to the second row center seatbelt pretensioner assembly
30%
Faulty seatbelt pretensioner/load limiter module in second row center position
20%
Restraint control module (RCM/ACM) internal fault or software corruption
10%
Open or short circuit in load limiter deployment squib circuit
5%
Poor ground connection for restraint system at second row seat location
Diagnostic Steps
1
Step 1: Perform visual inspection of second row center seatbelt assembly, buckle, and retractor mechanism for physical damage, signs of previous deployment, or water intrusion. Check connector at base of seatbelt for corrosion or backed-out pins.
2
Step 2: Using a digital multimeter, measure resistance across the load limiter squib terminals (typically 2-5 ohms for proper squib). Compare to manufacturer specifications. Ensure ignition is OFF and battery negative disconnected before testing.
3
Step 3: Inspect wiring harness routing from restraint control module to second row center seatbelt for pinched wires, chafing against seat frames, or damage from seat adjustment mechanisms. Pay special attention to flex points.
4
Step 4: Check restraint control module connector terminals for corrosion, bent pins, or loose connections. Measure voltage supply and ground circuits to the module (typically battery voltage and solid ground).
5
Step 5: If all circuits test normal, perform restraint control module self-test function using scan tool diagnostic functions to isolate internal module fault versus component fault.
6
Step 6: Clear codes, perform road test with multiple seat adjustment cycles, and re-scan to verify repair. Ensure airbag warning light extinguishes and no codes return.
Estimated Repair Cost
$300 - $1,500
Parts + labor, varies by vehicle and location
This code indicates a fault in the second row center seatbelt load limiter deployment control circuit. The restraint control module has detected an abnormal condition in the load limiter system, which is designed to allow controlled seatbelt webbing release during a collision to reduce chest injury....
The most common cause of B0084 (Second Row Center Seatbelt Load Limiter Deployment Control (Subfault)) is: Damaged or corroded wiring harness/connectors to the second row center seatbelt pretensioner assembly
Typical repair costs for B0084 range from $300 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This is a critical safety system fault that may prevent proper seatbelt load limiting during a collision, potentially increasing injury risk to the second row center occupant. The vehicle should be repaired immediately as the restraint system may not function as designed in a crash. Do not allow passengers in the second row center position until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B0084 to identify the root cause.
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Quick Info
Category
Body
System
Supplemental Restraint System (SRS/Airbag)
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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