Passenger Airbag Circuit Short to Ground
Diagnostic trouble code B1927 indicates a short to ground in the passenger airbag circuit, as detected by the Restraints Control Module (RCM). This manufacturer-specific code (Ford group) means the RCM has measured abnormally low resistance in the deployment loop, which could cause accidental airbag deployment. The system is designed to disable the airbag and illuminate the warning light to prevent unintended activation.
1. Commonly Affected Makes
2. Most Common Causes
- Short to ground in the passenger airbag wiring harness
- Out-of-range resistance in the deployment circuit
- Loose or corroded electrical connections under the passenger seat
- Defective passenger side airbag module
3. Symptoms You Will Notice
- Airbag warning light illuminated on the dashboard
- Passenger airbag may be disabled (no deployment in a crash)
4. Step-by-Step Diagnosis
Scan the RCM for codes and confirm B1927 is present
Visually inspect the passenger airbag wiring harness for damage, chafing, or pinching
Check connector pins under the passenger seat for corrosion or looseness
Measure resistance between the airbag circuit wires; compare to manufacturer specifications
If wiring is intact, test the RCM and passenger airbag module per service manual procedures
5. Frequently Asked Questions
Is it safe to drive?▼
No, it is not safe to drive because the passenger airbag may be disabled or could deploy unexpectedly, increasing injury risk in a crash. Have the vehicle towed to a repair shop.
How much does it cost to fix?▼
Repair costs typically range from $200 to $800, depending on whether the issue is a simple wiring repair or requires replacing the airbag module or RCM.