What it means
This code identifies a fault associated with the left curtain airbag deployment control 2. The restraint control module sets it when it detects a problem in that deployment control; the exact fault is specified by accompanying subfault information.
How it works
This code concerns the deployment circuit for the left curtain airbag, which is intended to provide side-window coverage for occupants on the vehicle’s left. The restraint control module has detected a problem in that circuit, but B0023’s exact electrical condition must be read from the accompanying subfault details.
Common causes
Most likely first.
- Curtain airbag wiring or connector fault
- Open or shorted deployment circuit
- Faulty left curtain airbag module
- Restraint control module fault
Symptoms
- Airbag warning light on
- Left curtain airbag may not deploy in a crash
How to diagnose it
- Use an SRS-capable scan tool to read the subfault information and confirm which left curtain deployment loop the module identifies.
- Follow the manufacturer’s SRS disable procedure before visually checking the left curtain connectors and harness for corrosion, damage, or an unseated plug.
- Inspect the wiring through the left pillar and roof-rail route for pinching or abrasion, and check for signs of recent trim or body work.
- Test the circuit condition indicated by the subfault using the manufacturer’s approved SRS method; never apply a test light or ordinary ohmmeter to the inflator.
- If the wiring and connectors pass, continue with the manufacturer’s component checks for the left curtain airbag and restraint control module.
Common fixes
- Repair any damaged left curtain harness or terminals according to SRS service information.
- Reseat or replace a faulty connector after safely disabling the system as specified.
- Repair an open or short found in the left curtain deployment loop.
- Replace the curtain module or restraint control module only if the specified diagnosis confirms it is defective.
Can I keep driving?
Left-side curtain protection may be reduced or unavailable in a crash while the SRS fault remains. Arrange prompt diagnosis and avoid work around the left pillars and roof rail.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.