DTC B0099 – Front Impact Sensor Circuit Fault

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DTC B0099 – Front Impact Sensor Circuit Fault

What Does DTC B0099 Mean?

DTC B0099 indicates that the Supplemental Restraint System (SRS) has detected an electrical fault in the front impact sensor circuit. Depending on the vehicle manufacturer, the code may refer to the impact sensor, wiring harness, connector, or the SRS control module. Always verify the exact definition using the factory service information for the specific vehicle.

Severity

High. This code can disable part or all of the airbag system, reducing occupant protection during a collision.

Can You Drive with B0099?

The vehicle is usually drivable, but the airbag system may not deploy correctly in an accident. The problem should be repaired as soon as possible.

Symptoms

  • SRS or Airbag warning light ON.
  • B0099 stored in the SRS control module.
  • Airbag system disabled.
  • SRS warning message on the instrument cluster.

Common Causes

  • Defective front impact sensor.
  • Open circuit in the sensor wiring.
  • Short to ground or battery voltage.
  • Loose, damaged, or corroded connector.
  • Faulty SRS control module.

How to Diagnose B0099

  1. Read all SRS diagnostic trouble codes.
  2. Inspect the front impact sensor and connector.
  3. Check the wiring harness for damage or corrosion.
  4. Measure continuity and inspect for shorts.
  5. Repair the fault, clear the code, and confirm it does not return.

Typical Sensor Circuit

      SRS Module
          │
          │
   Wiring Harness
          │
          ▼
     Connector
          │
          ▼
 Front Impact Sensor

Estimated Repair Cost

  • Wiring repair: $50–150
  • Connector replacement: $30–100
  • Impact sensor replacement: $100–350
  • SRS module replacement: $300–900

Related DTCs

  • B0097
  • B0098
  • B0100
  • B0101

Frequently Asked Questions

Can moisture cause B0099?

Yes. Water intrusion can corrode connectors or wiring and trigger this code.

Will replacing the sensor always solve B0099?

No. The wiring harness and connector should be inspected before replacing the sensor.

Is B0099 the same for every vehicle?

No. The exact code description and diagnostic procedure vary by manufacturer. Always refer to the factory service manual for the specific vehicle.

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