What Does B1996 Mean?
This code indicates the Airbag Control Module (ACM) has detected a short to battery voltage (Vbatt) in the passenger side-mounted airbag circuit. The ACM continuously monitors airbag circuits for proper resistance and voltage levels, and this fault means the circuit is receiving unintended battery voltage instead of the normal low-voltage reference signal. This condition disables the passenger side airbag system to prevent unintended deployment.
Safety Warning
The vehicle should not be driven as the passenger side airbag is disabled and will not deploy in a collision, posing serious injury risk to occupants. This is a safety-critical system requiring immediate professional repair before operating the vehicle with passengers.
Common Causes
45%
Damaged wiring harness or chafed wire insulation in passenger seat tracks causing short to power
30%
Faulty side airbag module with internal short circuit
15%
Corroded or damaged connector at seat-mounted airbag allowing moisture intrusion and short
10%
Faulty Airbag Control Module with internal circuit failure
Diagnostic Steps
1
Step 1: Disconnect battery negative terminal and wait 15 minutes for airbag system capacitor discharge. Remove passenger seat to access side airbag connector and visually inspect wiring harness for physical damage, chafing, pinching, or exposed copper particularly in seat track areas where movement occurs
2
Step 2: Using a digital multimeter in resistance mode, disconnect the passenger side airbag connector at the airbag module and measure resistance between both airbag circuit wires and vehicle ground. Reading should be greater than 10k ohms; low resistance indicates short to ground or power through vehicle chassis
3
Step 3: Disconnect the airbag connector at the ACM side and measure resistance between the passenger side airbag circuit wire and battery positive terminal. Any continuity (less than 5 ohms) confirms short to Vbatt in the harness requiring repair or replacement
4
Step 4: If harness tests good, measure resistance across the airbag module terminals (with module disconnected). Resistance should be 2-3 ohms typically. Out-of-range readings indicate faulty airbag module requiring replacement
5
Step 5: If all components test within specification, suspect ACM internal fault. Substitute known-good ACM or have original module bench-tested by qualified technician
6
Step 6: After repairs, reconnect all components, clear codes, perform airbag system self-test, and verify code does not return. Conduct test drive and recheck for stored or pending codes
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
This code indicates the Airbag Control Module (ACM) has detected a short to battery voltage (Vbatt) in the passenger side-mounted airbag circuit. The ACM continuously monitors airbag circuits for proper resistance and voltage levels, and this fault means the circuit is receiving unintended battery v...
The most common cause of B1996 (Passenger Sid, Side mount Airbag Circuit Short to Vbatt) is: Damaged wiring harness or chafed wire insulation in passenger seat tracks causing short to power
Typical repair costs for B1996 range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle should not be driven as the passenger side airbag is disabled and will not deploy in a collision, posing serious injury risk to occupants. This is a safety-critical system requiring immediate professional repair before operating the vehicle with passengers.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1996 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
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
