B0016 Passenger Frontal Stage 2 Deployment Control Circuit Low

The B0016 Diagnostic Trouble Code (DTC) indicates that the Supplemental Restraint System (SRS) has detected a low voltage or short-to-ground condition in the Passenger Frontal Airbag Stage 2 deployment control circuit. If this fault is present, the second-stage deployment of the passenger front airbag may not function correctly during a severe frontal collision.

Symptoms

• Airbag (SRS) warning light is illuminated.
• B0016 DTC stored in the SRS control module.
• Passenger frontal airbag Stage 2 may be disabled.
• Other SRS-related diagnostic trouble codes may also be present.

Possible Causes

• Short to ground in the Stage 2 deployment circuit.
• Damaged, pinched, or melted wiring harness.
• Loose or corroded electrical connectors.
• Faulty passenger airbag Stage 2 inflator.
• Poor terminal contact.
• Faulty SRS (Airbag) control module.

Simple Circuit Diagram

          Battery
             │
             │
     SRS Control Module
             │
 Passenger Stage 2 Output
             │
      Wiring Harness
             │
 Passenger Airbag Stage 2
             │
          Ground

How to Diagnose

1. Read all SRS trouble codes using a professional diagnostic scan tool.
2. Inspect the passenger airbag connectors and wiring.
3. Check for shorted wires or damaged insulation.
4. Inspect connector terminals for corrosion or loose pins.
5. Verify circuit integrity using the manufacturer's wiring diagram.
6. Repair the fault, clear the DTC, and confirm it does not return.

Live Data Check

Most scan tools do not provide live data for airbag deployment circuits. Access the SRS diagnostic menu and monitor the Passenger Airbag Stage 2 circuit status. Depending on the manufacturer, the circuit may display Normal, Low Voltage, Short to Ground, or Fault Active.

Common Repairs

• Repair or replace damaged wiring.
• Replace loose or corroded connectors.
• Repair poor terminal contact.
• Replace the passenger airbag Stage 2 module if defective.
• Replace or reprogram the SRS control module if required.

Important Safety Notice

Always disconnect the negative battery terminal and wait the manufacturer-specified time before working on any SRS component. Never measure the resistance of an airbag inflator with a standard multimeter because accidental deployment may occur.

Conclusion

DTC B0016 indicates a low-voltage or short-to-ground condition in the Passenger Frontal Airbag Stage 2 deployment circuit. Prompt diagnosis and repair are necessary to restore proper airbag operation and ensure maximum occupant protection.