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OBD-II · B0004

Driver Frontal Deployment Loop Resistance High

The SRS module measured a higher than expected resistance in the driver frontal airbag deployment circuit. Causes include a partially open connection, corroded contacts, or a damaged clock spring conductor.

What this code tells you

The vehicle detected a condition matching the diagnostic criteria for B0004. The code guides testing; it does not confirm which component caused the condition.

Reasonable next steps

  1. Record all stored and pending codes plus freeze-frame data before clearing anything.
  2. Check service information for the exact year, make, model and powertrain.
  3. Inspect related wiring, connectors, hoses and obvious damage before replacing parts.
  4. Use measured test results or a qualified technician to confirm the root cause.
A flashing check-engine light, severe misfire, overheating, oil-pressure warning, brake warning or unsafe drivability warrants stopping safely and obtaining professional help.