Airbags

B0038 — Second Row Right Side Airbag Deployment Control Circuit Fault

Severity: high Drive with care, to a shop

What B0038 means

B0038 means the airbag control module detected a problem in the deployment control circuit for the right side airbag in the second row. This is typically an open, a short, or a communication error in that circuit. With this fault the system can't be sure the airbag will deploy in a crash, and it usually disables it.

Symptoms

  • SRS/AIRBAG warning light is on or flashing
  • The second-row right side airbag may be disabled by the system
  • The code returns after clearing and restarting the ignition
  • Possible loss of communication with the airbag module
  • Other SRS codes for rear airbags or curtains

Possible causes

  1. Damaged wiring or corroded connectors in the airbag circuit (often under the seat or in the body pillar)
  2. Poor contact or a loose connector latch at the airbag
  3. Faulty airbag or its inflator/squib
  4. Faulty SRS control module or side impact sensor
  5. Open or shorted auxiliary switch circuit (on some vehicles)
  6. Water intrusion, collision repair, or incorrectly refitted seats and trim

How to diagnose

  1. Scan all codes with an SRS-capable tool and note the freeze frame data
  2. Ask about recent collisions, seat or upholstery work, or water in the cabin
  3. Disconnect the battery and wait the time specified by the manufacturer to avoid accidental deployment
  4. Inspect the second-row right airbag wiring and connectors for damage, corrosion, and pinched wires
  5. Check circuit resistance and shorts to ground or power per the factory wiring diagram, never applying voltage to the squib
  6. Check the connectors at the SRS module and the side impact sensor
  7. Clear the code and see if it returns; if it does, test the module and look for a software update

Common fixes

  • Repair the wiring harness or replace the damaged connector
  • Clean the terminals and secure the connectors firmly
  • Replace the airbag or a faulty sensor
  • Replace or reflash the SRS control module
  • Clear the code and verify the system after repair

Questions and answers

What does code B0038 mean?

The SRS module found a fault in the control circuit of the second-row right side airbag. The most common cause is wiring or a connector, less often the airbag itself or the module.

Can I drive with B0038?

Yes, the car will run normally. But the airbag may not deploy in a crash, so don't put off the repair.

Can I fix B0038 myself?

An experienced owner can inspect connectors and wiring with the battery disconnected. Work on the airbag itself and circuit tests at the squib are best left to a professional.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.