OBD Guide
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B273F

Airbag Signal Test Failed

B273F is an OBD-II diagnostic trouble code meaning: Airbag Signal Test Failed. Common causes: malfunction of the airbag squib (squib), open circuit in the airbag initiation circuit wiring harness. Estimated repair cost: $56–667.

Severity
🚨 Critical
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–667 (est.)

Symptoms

  • The SRS malfunction lamp is constantly on
  • Code B273F in the memory of the SRS control unit
  • Possible incorrect operation of the airbag in an accident
  • The SRS system goes into emergency mode

Causes

  • Malfunction of the airbag squib (squib)
  • Open circuit in the airbag initiation circuit wiring harness
  • Short circuit in the airbag activation circuit
  • Malfunction of internal circuits of the SRS control unit
  • Damage to the contacts in the connector of the SRS unit or airbag

How to Fix

  1. Read all SRS unit error codes using specialized diagnostic equipment
  2. Disconnect the battery and wait at least 3 minutes for the SRS capacitors to discharge
  3. Identify the specific pad or circuit that fails the test
  4. Check the wiring harness and connectors of the initiating circuit of the indicated airbag.
  5. Measure the resistance of the squib (only with a special ohmmeter for SRS with limited current!)
  6. If the squib or wiring is faulty, contact a specialized service for replacement.

Related codes

B273EB2740B0001B0002B0051

FAQ

What does the B273F code mean?

B273F is an OBD-II diagnostic trouble code that indicates: Airbag Signal Test Failed

What causes a B273F error code?

The most common causes of B273F include: Malfunction of the airbag squib (squib); Open circuit in the airbag initiation circuit wiring harness; Short circuit in the airbag activation circuit; Malfunction of internal circuits of the SRS control unit.

How do I fix a B273F diagnostic trouble code?

To fix B273F: Read all SRS unit error codes using specialized diagnostic equipment. Disconnect the battery and wait at least 3 minutes for the SRS capacitors to discharge. Identify the specific pad or circuit that fails the test. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B273F?

Do not drive — repair immediately

How much does it cost to fix B273F?

The estimated repair cost for B273F is $56–667. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat