What Does B2229 Mean?
This code indicates the airbag control module (ACM) has detected an electrical short to ground in the passenger airbag deployment circuit loop #2. The ACM continuously monitors the resistance and continuity of all airbag circuits, and this fault means current is flowing to ground through an unintended path in the passenger airbag wiring or connector. This condition prevents proper airbag deployment and typically disables the supplemental restraint system.
Safety Warning
Vehicle is unsafe to drive as the passenger airbag will not deploy in a collision, leaving occupants unprotected. The airbag warning light will be illuminated and the entire SRS system may be disabled. Immediate repair is required before transporting passengers.
Common Causes
45%
Damaged or chafed wiring harness under passenger seat causing short to vehicle ground
30%
Corroded or moisture-damaged connector at passenger airbag module
15%
Failed passenger airbag module internal short circuit
10%
Faulty airbag control module misreading circuit resistance
Diagnostic Steps
1
Step 1: Perform visual inspection of passenger airbag wiring harness under seat and along floor pan for visible damage, chafing, pinched wires, or exposed copper. Check for any recent seat repairs or modifications that may have damaged wiring.
2
Step 2: Disconnect battery negative terminal and wait 10 minutes for airbag system capacitor discharge. Disconnect passenger airbag module connector and inspect for corrosion, moisture, bent pins, or physical damage. Clean connector with electrical contact cleaner if corrosion present.
3
Step 3: Using a digital multimeter in ohms mode, measure resistance between passenger airbag circuit loop #2 terminal at ACM connector (airbag module disconnected) and vehicle ground. Reading should be infinite resistance (open circuit). Any continuity to ground confirms short location is between ACM and airbag module.
4
Step 4: If short to ground confirmed, isolate fault by disconnecting intermediate connectors along harness (clock spring, under-dash junction, seat connector) and repeat resistance test at each point to pinpoint exact location of short. Repair or replace damaged wiring section, reconnect all components, clear codes, and verify airbag light extinguishes with no code return.
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
This code indicates the airbag control module (ACM) has detected an electrical short to ground in the passenger airbag deployment circuit loop #2. The ACM continuously monitors the resistance and continuity of all airbag circuits, and this fault means current is flowing to ground through an unintend...
The most common cause of B2229 (Air Bag Passenger Circuit Short to Ground - Loop #2) is: Damaged or chafed wiring harness under passenger seat causing short to vehicle ground
Typical repair costs for B2229 range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is unsafe to drive as the passenger airbag will not deploy in a collision, leaving occupants unprotected. The airbag warning light will be illuminated and the entire SRS system may be disabled. Immediate repair is required before transporting passengers.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2229 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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