What Does B0028 Mean?
This code indicates the airbag control module (ACM) has detected abnormally low electrical resistance in the right front passenger side airbag deployment circuit. The resistance is below the manufacturer's specified threshold, typically indicating a short to ground or damaged wiring in the squib circuit. This fault prevents proper airbag deployment and illuminates the airbag warning light on the dashboard.
Safety Warning
The vehicle is unsafe to drive as the right front passenger airbag will not deploy in a collision, significantly increasing injury risk. The airbag warning light will be illuminated and the entire SRS system may be disabled until repaired.
Common Causes
35%
Damaged or chafed wiring harness in the deployment loop causing short to ground
30%
Faulty right front passenger airbag module with internal short circuit
20%
Corroded or damaged airbag connector with moisture intrusion causing short
10%
Faulty airbag control module misreading circuit resistance
5%
Improper airbag installation or connector not fully seated after previous service
Diagnostic Steps
1
Step 1: Perform visual inspection of right front passenger airbag and all visible wiring harnesses for physical damage, chafing, pinch points, or signs of previous collision repair. Check for moisture in connectors.
2
Step 2: Disconnect the battery and wait 10 minutes for airbag system capacitor discharge. Disconnect the right front passenger airbag connector and inspect terminals for corrosion, bent pins, or damage.
3
Step 3: Using a digital multimeter, measure resistance across the airbag squib terminals (typically 2-3 ohms normal range). Compare reading to manufacturer specifications. Also check for continuity to ground on each circuit.
4
Step 4: If squib resistance is normal, measure resistance of the wiring harness from the ACM connector to the airbag connector. Look for values below 1 ohm and no shorts to ground on either circuit.
5
Step 5: If wiring is intact, substitute known-good airbag module (if available) to verify internal squib failure. If harness shows short, trace wire routing through dashboard and A-pillar for damage points.
6
Step 6: After repairs, reconnect all components, clear codes, and perform airbag system self-test. Verify resistance values are within specification and warning light extinguishes.
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
This code indicates the airbag control module (ACM) has detected abnormally low electrical resistance in the right front passenger side airbag deployment circuit. The resistance is below the manufacturer's specified threshold, typically indicating a short to ground or damaged wiring in the squib cir...
The most common cause of B0028 (Right Front Passenger Side Deployment Loop Resistance Low) is: Damaged or chafed wiring harness in the deployment loop causing short to ground
Typical repair costs for B0028 range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is unsafe to drive as the right front passenger airbag will not deploy in a collision, significantly increasing injury risk. The airbag warning light will be illuminated and the entire SRS system may be disabled until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B0028 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.
