B0087 DTC – Left Rear Side Impact Sensor Circuit Malfunction

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B0087 DTC – Left Rear Side Impact Sensor Circuit Malfunction

The Diagnostic Trouble Code (DTC) B0087 indicates that the Supplemental Restraint System (SRS) has detected a malfunction in the left rear side impact sensor circuit. This sensor monitors side impacts and sends collision data to the SRS control module to determine whether side airbags should deploy. The exact wiring and sensor location vary by vehicle manufacturer.

Symptoms

  • Airbag warning light illuminated.
  • Service Airbag message displayed.
  • Side airbag system disabled.
  • B0087 stored in the SRS control module.

Possible Causes

  • Faulty left rear side impact sensor.
  • Open circuit in the sensor wiring.
  • Short to ground or battery voltage.
  • Loose or corroded connector.
  • Damaged wiring harness.
  • Faulty SRS (SDM) control module.

How to Diagnose B0087

  1. Scan the SRS system using a professional scan tool.
  2. Check for additional airbag DTCs.
  3. Inspect the left rear side impact sensor connector.
  4. Check the wiring harness for damage or corrosion.
  5. Verify circuit continuity with a multimeter.
  6. Replace the sensor if the wiring is normal.
  7. Clear the DTC and verify that it does not return.

Typical Circuit Diagram

        SRS Control Module
               │
               │
               ▼
 Left Rear Side Impact Sensor
               │
               │
               ▼
      Impact Signal to SDM
               │
               ▼
      Airbag Deployment Logic

Repair Cost

  • Wiring repair: $30–120
  • Side impact sensor replacement: $80–250
  • SRS control module replacement: $300–900

Related DTCs

  • B0086
  • B0087
  • B0088
  • B0089

FAQ

Can I continue driving with DTC B0087?

Yes, but the airbag system may not operate correctly during a collision, so the fault should be repaired as soon as possible.

Can a bad connector cause B0087?

Yes. Loose, damaged, or corroded connectors are among the most common causes of this DTC.

Will clearing the code fix the problem?

No. The code will usually return until the underlying electrical or sensor fault has been repaired.

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