What Does B0043 Mean?
This code indicates a fault detected in the third-row left frontal airbag deployment control circuit, specifically in the stage 3 deployment level. The airbag control module has detected an electrical or communication subfault that prevents proper control of this specific airbag stage. This is a critical safety system fault that disables proper airbag deployment functionality for the third-row left occupant position.
Safety Warning
This is a critical safety system fault that compromises airbag deployment capability for third-row occupants. The vehicle should not be driven with passengers in the third row until repairs are completed, as the airbag may not deploy properly in a collision.
Common Causes
35%
Damaged or corroded wiring harness and connectors between airbag control module and third row left airbag inflator
30%
Faulty airbag control module with internal circuit failure affecting stage 3 deployment control
25%
Defective third row left frontal airbag inflator or internal resistance out of specification
10%
Poor ground connection or high resistance in airbag system ground circuit
Diagnostic Steps
1
Step 1: Perform visual inspection of third row left seat area, remove seat covers and trim panels to access airbag wiring harness, inspect for pinched wires, chafing, water intrusion, or corrosion at connectors
2
Step 2: Using a digital multimeter, measure resistance of third row left frontal airbag inflator at the connector (disconnected from harness), verify resistance is within manufacturer specification (typically 2-3 ohms for dual-stage inflators)
3
Step 3: Test continuity and resistance of all wiring between airbag control module connector and third row left airbag connector, check for short to ground, short to power, and open circuits on all stage 3 deployment control wires
4
Step 4: Verify ground circuit integrity by measuring voltage drop between airbag control module ground and battery negative terminal with ignition on (should be less than 0.1V), check all ground connection points for corrosion or looseness
5
Step 5: If all wiring and inflator test normal, substitute airbag control module with known-good unit or perform manufacturer-specific ACM internal diagnostics, clear codes and verify fault does not return
6
Step 6: After repairs, clear all airbag codes, perform airbag system self-test procedure, verify airbag warning light operates correctly and no codes return
Estimated Repair Cost
$300 - $2,500
Parts + labor, varies by vehicle and location
This code indicates a fault detected in the third-row left frontal airbag deployment control circuit, specifically in the stage 3 deployment level. The airbag control module has detected an electrical or communication subfault that prevents proper control of this specific airbag stage. This is a cri...
The most common cause of B0043 (Third Row Left Frontal Stage 3 Deployment Control (Subfault)) is: Damaged or corroded wiring harness and connectors between airbag control module and third row left airbag inflator
Typical repair costs for B0043 range from $300 to $2,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This is a critical safety system fault that compromises airbag deployment capability for third-row occupants. The vehicle should not be driven with passengers in the third row until repairs are completed, as the airbag may not deploy properly 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 B0043 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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