OBD Guide
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B1B56

1st Row Passenger Seat Belt Sensor Circuit Open

B1B56 is an OBD-II diagnostic trouble code meaning: 1st Row Passenger Seat Belt Sensor Circuit Open. Common causes: broken wire in the sensor harness, malfunction of the belt sensor itself. Estimated repair cost: $56–167.

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

Symptoms

  • SRS/airbag indicator is on
  • The SRS system may turn off
  • No response to seat belt fastening (if related features are active)

Causes

  • Broken wire in the sensor harness
  • Malfunction of the belt sensor itself
  • Poor contact in the sensor connector
  • Damage to SRS wiring harness
  • Problems with the SRS control unit

How to Fix

  1. Check the integrity of the sensor wiring harness
  2. Inspect the sensor connectors for corrosion or damage.
  3. Check the sensor resistance (compare with reference values)
  4. If necessary, replace the sensor or repair the harness
  5. Reset the error and check if it returns

Related codes

B1B55B1B57B1B58

FAQ

What does the B1B56 code mean?

B1B56 is an OBD-II diagnostic trouble code that indicates: 1st Row Passenger Seat Belt Sensor Circuit Open

What causes a B1B56 error code?

The most common causes of B1B56 include: Broken wire in the sensor harness; Malfunction of the belt sensor itself; Poor contact in the sensor connector; Damage to SRS wiring harness.

How do I fix a B1B56 diagnostic trouble code?

To fix B1B56: Check the integrity of the sensor wiring harness. Inspect the sensor connectors for corrosion or damage.. Check the sensor resistance (compare with reference values). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1B56?

Limited driving only, diagnose soon

How much does it cost to fix B1B56?

The estimated repair cost for B1B56 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat