OBD Guide
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B1793

Occupant Classification Sensor Power Supply Circuit Malfunction

B1793 is an OBD-II diagnostic trouble code meaning: Occupant Classification Sensor Power Supply Circuit Malfunction. Common causes: open or shorted sensor wiring harness, poor contact in the sensor connector. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Airbag light is on
  • The passive safety system gives an error
  • The airbag may not deploy in an accident.

Causes

  • Open or shorted sensor wiring harness
  • Poor contact in the sensor connector
  • Malfunction of the passenger classification sensor itself
  • Problems with the airbag control unit

How to Fix

  1. Check the integrity of the OCS sensor wiring harness
  2. Clean or replace sensor connectors
  3. Check the sensor supply voltage
  4. Replace the occupant classification sensor if necessary
  5. Reset the error and test the system

Related codes

B1790B1791B1792B1794

FAQ

What does the B1793 code mean?

B1793 is an OBD-II diagnostic trouble code that indicates: Occupant Classification Sensor Power Supply Circuit Malfunction

What causes a B1793 error code?

The most common causes of B1793 include: Open or shorted sensor wiring harness; Poor contact in the sensor connector; Malfunction of the passenger classification sensor itself; Problems with the airbag control unit.

How do I fix a B1793 diagnostic trouble code?

To fix B1793: Check the integrity of the OCS sensor wiring harness. Clean or replace sensor connectors. Check the sensor supply voltage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1793?

Do not drive — repair immediately

How much does it cost to fix B1793?

The estimated repair cost for B1793 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat