What Does B0030 Mean?
DTC B0030 indicates the Airbag Control Module (ACM) has detected a fault in the deployment circuit for the second row left side airbag. This subfault suggests an issue with the electrical circuit, wiring, connector integrity, or the airbag squib itself that prevents proper deployment control. The ACM has identified an abnormal resistance, open circuit, short circuit, or communication error in this specific airbag circuit.
Safety Warning
This is a critical safety system fault that compromises occupant protection in the second row left seating position. The affected airbag will not deploy in a collision, significantly increasing injury risk. Vehicle should be repaired immediately and passengers should avoid using this seating position until resolved.
Common Causes
45%
Damaged or corroded wiring harness and connectors in the second row left seat area due to moisture intrusion, seat movement, or physical damage
30%
Faulty second row left side airbag module with internal squib failure or damaged airbag unit
15%
Poor ground connection or broken ground wire in the airbag circuit affecting deployment control signal integrity
10%
Airbag Control Module internal fault or software corruption preventing proper circuit monitoring
Diagnostic Steps
1
Step 1: Perform a visual inspection of the second row left seat area, checking all visible wiring harnesses and connectors for physical damage, corrosion, bent pins, or moisture. Check under seat mounting points and along seat tracks for pinched or chafed wires
2
Step 2: Using a digital multimeter, measure the resistance across the second row left airbag squib connector (airbag disconnected) to verify squib resistance is within manufacturer specification, typically 2-3 ohms. Out-of-range readings indicate a faulty airbag module
3
Step 3: With ignition OFF and airbag disconnected, test continuity and resistance of the airbag circuit wiring from the ACM connector to the seat-mounted airbag connector. Check for opens (infinite resistance), shorts to ground (near-zero resistance), or shorts to power
4
Step 4: Inspect and test all ground connections in the airbag system circuit, ensuring clean metal-to-metal contact and resistance below 1 ohm to chassis ground. Clean and tighten ground points as needed
5
Step 5: If all wiring and connections test within specification, substitute a known-good second row left airbag assembly to confirm the airbag module itself is faulty before condemning the part
6
Step 6: After repairs, clear all DTCs, perform ACM system self-test procedures, and verify the airbag warning light extinguishes. Road test with multiple ignition cycles to confirm no code recurrence
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
DTC B0030 indicates the Airbag Control Module (ACM) has detected a fault in the deployment circuit for the second row left side airbag. This subfault suggests an issue with the electrical circuit, wiring, connector integrity, or the airbag squib itself that prevents proper deployment control. The AC...
The most common cause of B0030 (Second Row Left Side Airbag Deployment Control (Subfault)) is: Damaged or corroded wiring harness and connectors in the second row left seat area due to moisture intrusion, seat movement, or physical damage
Typical repair costs for B0030 range from $200 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 compromises occupant protection in the second row left seating position. The affected airbag will not deploy in a collision, significantly increasing injury risk. Vehicle should be repaired immediately and passengers should avoid using this seating position until resolved.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B0030 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
A quality scan tool helps you read codes, view live data, and clear faults.
