What Does B1920 Mean?
B1920 indicates the airbag control module has detected an electrical fault in the passenger-side airbag deployment circuit. This could involve the airbag inflator itself, the wiring harness connecting it to the control module, or the connectors in between. The airbag control module continuously monitors circuit resistance and continuity, and this code sets when values fall outside acceptable parameters.
Safety Warning
The passenger airbag will not deploy in a collision when this fault is present, creating serious injury risk for front passenger. The vehicle is technically drivable but the safety system is compromised and requires immediate professional repair.
Common Causes
35%
Damaged, corroded, or loose connector at passenger airbag or under seat
30%
Broken or chafed wiring in passenger airbag circuit harness
20%
Faulty passenger airbag inflator module
10%
Defective airbag control module (ACM/SRS control unit)
5%
Improperly installed or aftermarket passenger seat components interfering with circuit
Diagnostic Steps
1
Step 1: Perform visual inspection of passenger airbag connector (typically behind glove box or in dashboard). Check for corrosion, bent pins, moisture intrusion, or loose connection. Ensure connector locking tab is fully engaged.
2
Step 2: With ignition OFF and negative battery terminal disconnected for at least 10 minutes (to discharge airbag capacitors), measure resistance across passenger airbag circuit connector at airbag control module. Typical resistance should be 2-3 ohms; consult manufacturer specifications for exact values.
3
Step 3: Inspect entire passenger airbag wiring harness from control module to airbag for chafing, cuts, pinch points, or damage, especially where harness passes through firewall, under carpet, or near seat mounting points. Check for proper routing and clearance.
4
Step 4: If wiring and connectors are intact, check for proper voltage supply and ground at airbag control module using a digital multimeter. Verify module connector pins are not corroded or damaged.
5
Step 5: If all wiring and connections test normal, suspect faulty passenger airbag inflator or control module. Replace suspect component and use scan tool to clear codes and verify proper system operation with live data monitoring.
6
Step 6: After repair, perform final system verification by clearing codes, cycling ignition, and confirming airbag warning light operates normally (illuminates briefly during start-up then extinguishes) with no codes returning.
Estimated Repair Cost
$150 - $1,500
Parts + labor, varies by vehicle and location
B1920 indicates the airbag control module has detected an electrical fault in the passenger-side airbag deployment circuit. This could involve the airbag inflator itself, the wiring harness connecting it to the control module, or the connectors in between. The airbag control module continuously moni...
The most common cause of B1920 (Air Bag Passenger Circuit Failure) is: Damaged, corroded, or loose connector at passenger airbag or under seat
Typical repair costs for B1920 range from $150 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The passenger airbag will not deploy in a collision when this fault is present, creating serious injury risk for front passenger. The vehicle is technically drivable but the safety system is compromised and requires immediate professional repair.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1920 to identify the root cause.
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Quick Info
Category
Body
System
Supplemental Restraint System (SRS/Airbag)
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
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