OBD Guide
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B1012

Diagnosis Sensor Unit

B1012 is an OBD-II diagnostic trouble code meaning: Diagnosis Sensor Unit. Common causes: malfunction of the sensor diagnostic unit, damage to the srs wiring harness. Estimated repair cost: $56–167.

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

Symptoms

  • The SRS/airbag indicator on the dashboard is on
  • The passive restraint system is not activated during the test
  • Errors in the SRS unit memory

Causes

  • Malfunction of the sensor diagnostic unit
  • Damage to the SRS wiring harness
  • Corrosion or poor contact in connectors
  • Problems with module power supply (blown fuse)
  • SRS control unit software error

How to Fix

  1. Read all SRS fault codes
  2. Check the condition of the wiring harness and connectors
  3. Check fuses related to the SRS system
  4. Test the sensor diagnostic unit
  5. If necessary, replace the faulty module
  6. Reset errors and check system operation

Related codes

B1000B1013B1015

FAQ

What does the B1012 code mean?

B1012 is an OBD-II diagnostic trouble code that indicates: Diagnosis Sensor Unit

What causes a B1012 error code?

The most common causes of B1012 include: Malfunction of the sensor diagnostic unit; Damage to the SRS wiring harness; Corrosion or poor contact in connectors; Problems with module power supply (blown fuse).

How do I fix a B1012 diagnostic trouble code?

To fix B1012: Read all SRS fault codes. Check the condition of the wiring harness and connectors. Check fuses related to the SRS system. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1012?

Do not drive — repair immediately

How much does it cost to fix B1012?

The estimated repair cost for B1012 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat