Body Definition only Lights the check engine lamp

B004A: Third Row Right Frontal Stage 2 Deployment Control

Standardized SAE J2012 code · B00xx — Restraints and airbags

Safety-critical system. Faults in airbags, brakes, steering or high-voltage components can put people at risk. Follow the manufacturer's service information and safety procedures, or have the vehicle checked by a qualified workshop.

What does B004A mean?

Fault on third-row right frontal airbag, stage 2 deployment.

The code tells you which monitor failed, not which part is broken. Test before replacing parts.

Symptoms

  • Warning light or symbol related to the affected system
  • Comfort or safety function impaired

Common causes

  • High Stage 2 squib circuit open

Likelihood is a general estimate across vehicles; your make and model may differ.

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