What Does B002A Mean?
This code indicates the Airbag Control Module (ACM) has detected a fault in the secondary deployment circuit for the right-side curtain airbag system. The 'Subfault' designation means the control module has identified a specific electrical or mechanical issue within the deployment squib circuit, wiring harness, or airbag module itself. This fault prevents proper deployment capability of the right curtain airbag in the event of a side-impact or rollover collision.
Safety Warning
This vehicle is unsafe to drive as the right curtain airbag will not deploy in a side-impact or rollover collision, significantly increasing injury risk to front and rear passengers on that side. This repair should be considered urgent and performed immediately by a qualified technician due to safety-critical nature and risk of accidental deployment during DIY repairs.
Common Causes
45%
Open circuit, high resistance, or corrosion in the right curtain airbag wiring harness or connector pins
30%
Faulty right curtain airbag inflator module or degraded squib resistance
15%
Damaged or corroded airbag control module internal circuitry affecting deployment circuit 2
10%
Low vehicle battery voltage or poor ground connection to airbag system during self-test
Diagnostic Steps
1
Step 1: Perform visual inspection of right curtain airbag and all visible wiring from the headliner area to ACM location. Check for physical damage, water intrusion, pinched wires, or disconnected connectors. Inspect B-pillar area and roof rail for accident damage.
2
Step 2: Disconnect vehicle battery and wait 10 minutes for airbag capacitor discharge. Using a digital multimeter, measure resistance across right curtain airbag squib terminals (typically 2-4 ohms for normal squib). Compare reading to manufacturer specifications.
3
Step 3: Inspect and test continuity of right curtain airbag circuit wiring from ACM connector to airbag module connector. Check for opens, shorts to ground, or shorts to power. Measure resistance of entire circuit (should be close to squib resistance plus minimal wire resistance).
4
Step 4: Check ACM connector pins for corrosion, bent terminals, or moisture intrusion. Clean or repair connector as needed. Verify proper seating of all airbag system connectors.
5
Step 5: Test vehicle battery voltage (should be above 12.4V with engine off, 13.8-14.5V running). Check all airbag system ground connections for continuity and clean contact to chassis.
6
Step 6: Clear codes and perform ACM self-test procedure. If code returns immediately, replace faulty component (airbag module or ACM based on resistance/continuity tests). Verify proper repair with final system scan and road test.
Estimated Repair Cost
$400 - $2,500
Parts + labor, varies by vehicle and location
This code indicates the Airbag Control Module (ACM) has detected a fault in the secondary deployment circuit for the right-side curtain airbag system. The 'Subfault' designation means the control module has identified a specific electrical or mechanical issue within the deployment squib circuit, wir...
The most common cause of B002A (Right Curtain Deployment Control 2 (Subfault)) is: Open circuit, high resistance, or corrosion in the right curtain airbag wiring harness or connector pins
Typical repair costs for B002A range from $400 to $2,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This vehicle is unsafe to drive as the right curtain airbag will not deploy in a side-impact or rollover collision, significantly increasing injury risk to front and rear passengers on that side. This repair should be considered urgent and performed immediately by a qualified technician due to safety-critical nature and risk of accidental deployment during DIY repairs.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B002A to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
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.
