B0018: 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’s second deployment stage has a dedicated control circuit monitored by the restraint control module. B0018 flags a fault associated with that stage 2 path; the accompanying subfault information is needed to identify the specific electrical condition or component involved.

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. Use an SRS-capable scan tool to retrieve B0018’s subfault and freeze-frame data before clearing it.
2. Follow the manufacturer’s SRS safeing procedure, then inspect the passenger airbag stage 2 connector and nearby wiring for damage, looseness, or corrosion.
3. Test the stage 2 deployment circuit for an open, short, or poor connection using the manufacturer’s specified SRS procedure.
4. If the harness checks pass, test the passenger airbag module and restraint control module according to service information.
5. After repair, clear the code and rescan to confirm the passenger stage 2 fault does not return.

Common fixes

• Secure or repair a damaged or corroded passenger stage 2 connector using approved SRS procedures.
• Repair damaged or open wiring in the passenger stage 2 circuit.
• Replace the passenger airbag module if its stage 2 circuit fails the specified test.
• Replace or repair the restraint control module only if diagnostics confirm it is faulty.

Can I keep driving?

The passenger frontal airbag’s second stage may be unavailable, so passenger crash protection can be reduced. Limit driving while arranging prompt SRS diagnosis and repair.