OBD Guide
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B1B50

1st Row Driver Seat Belt Sensor Circuit Low

B1B50 is an OBD-II diagnostic trouble code meaning: 1st Row Driver Seat Belt Sensor Circuit Low. Common causes: open or shorted sensor wiring harness, poor contact in the sensor connector. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Airbag light is on
  • The SRS system may not work in an emergency situation
  • Possible false alarms of the system

Causes

  • Open or shorted sensor wiring harness
  • Poor contact in the sensor connector
  • Seat belt sensor malfunction
  • Problems with the SRS control unit

How to Fix

  1. Check the integrity of the sensor wiring harness
  2. Clean and check the contacts in the sensor connector
  3. Replace the seat belt sensor if necessary
  4. Check and replace the SRS control unit if faulty

Related codes

B1B51B1B52B1B53

FAQ

What does the B1B50 code mean?

B1B50 is an OBD-II diagnostic trouble code that indicates: 1st Row Driver Seat Belt Sensor Circuit Low

What causes a B1B50 error code?

The most common causes of B1B50 include: Open or shorted sensor wiring harness; Poor contact in the sensor connector; Seat belt sensor malfunction; Problems with the SRS control unit.

How do I fix a B1B50 diagnostic trouble code?

To fix B1B50: Check the integrity of the sensor wiring harness. Clean and check the contacts in the sensor connector. Replace the seat belt sensor if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1B50?

Limited driving only, diagnose soon

How much does it cost to fix B1B50?

The estimated repair cost for B1B50 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat