OBD Guide
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B1020

Occupant Sensor Control Unit

B1020 is an OBD-II diagnostic trouble code meaning: Occupant Sensor Control Unit. Common causes: open or shorted sensor wiring harness, passenger position sensor malfunction. Estimated repair cost: $56–167.

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

Symptoms

  • Airbag light is on
  • The passive restraint system does not activate for the passenger
  • Diagnostic system memory error

Causes

  • Open or shorted sensor wiring harness
  • Passenger position sensor malfunction
  • Problems with the airbag control module
  • Corrosion of contacts or connectors

How to Fix

  1. Check the integrity of the sensor wiring harness
  2. Inspect connectors and contacts for corrosion
  3. Test passenger position sensor
  4. Check the airbag control module
  5. Reset the error and check for its reappearance

Related codes

B1010B1030B1040

FAQ

What does the B1020 code mean?

B1020 is an OBD-II diagnostic trouble code that indicates: Occupant Sensor Control Unit

What causes a B1020 error code?

The most common causes of B1020 include: Open or shorted sensor wiring harness; Passenger position sensor malfunction; Problems with the airbag control module; Corrosion of contacts or connectors.

How do I fix a B1020 diagnostic trouble code?

To fix B1020: Check the integrity of the sensor wiring harness. Inspect connectors and contacts for corrosion. Test passenger position sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1020?

Do not drive — repair immediately

How much does it cost to fix B1020?

The estimated repair cost for B1020 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat