B0019: Passenger Frontal Stage 2 Deployment Control

What it means

This code identifies a fault associated with the passenger frontal airbag stage 2 deployment control. The restraint control module sets it when it detects a fault in that deployment control; the exact fault depends on the accompanying subfault information.

How it works

The passenger frontal airbag uses a second-stage inflator that the restraint control module can command when crash severity calls for additional inflation. The module monitors that stage’s deployment circuit and stores B0019 when it detects a fault; the accompanying subfault information identifies the circuit condition.

Common causes

Most likely first.

1. Damaged passenger airbag wiring or connector
2. Open or shorted deployment circuit
3. Faulty passenger airbag module
4. Restraint control module fault

Symptoms

• Airbag warning light on
• Passenger frontal airbag stage may be unavailable in a crash

How to diagnose it

1. Read the restraint-module fault details and freeze-frame data with an SRS-capable scan tool to identify the reported subfault and whether it is current or intermittent.
2. With the vehicle powered down according to the manufacturer’s SRS service procedure, visually inspect the passenger frontal airbag connectors and harness for damage, corrosion, or displaced terminals.
3. Check the stage 2 deployment wiring for pinching, abrasion, an open, or a short, following the manufacturer’s procedure and avoiding direct probing of the inflator circuit.
4. Use the specified SRS diagnostic method to assess circuit continuity and connector integrity; do not measure an airbag inflator with an ordinary ohmmeter.
5. If the wiring and connectors pass, follow the manufacturer’s diagnostic tree to evaluate the passenger airbag module and restraint control module.

Common fixes

• Repair damaged passenger airbag wiring or terminals using the approved SRS repair procedure.
• Reseat or replace a damaged connector after following the manufacturer’s SRS disable procedure.
• Repair an open or short in the stage 2 deployment circuit as directed by the service information.
• Replace the passenger airbag module or restraint control module only if the specified tests identify it as faulty.

Can I keep driving?

The car may remain driveable, but the passenger frontal airbag’s second stage may not operate in a crash. Arrange diagnosis promptly, keep the passenger seat and airbag area undisturbed, and follow the vehicle’s warning guidance.