OBD Guide
ENFRDEESPT

B1111

Diagnosis Sensor Unit

B1111 is an OBD-II diagnostic trouble code meaning: Diagnosis Sensor Unit. Common causes: malfunction of the passive safety system diagnostic unit (malfunction), problems with the wiring harness (harness) to the unit. Estimated repair cost: $167–333.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$167–333 (est.)

Symptoms

  • The airbag light on the dashboard is on
  • The passive safety system does not function
  • The error does not disappear after a scanner reset

Causes

  • Malfunction of the passive safety system diagnostic unit (malfunction)
  • Problems with the wiring harness (harness) to the unit
  • Short circuit or open circuit
  • Low voltage in the on-board network
  • Contact corrosion

How to Fix

  1. Check the supply voltage of the diagnostic unit
  2. Inspect the wiring harness for damage
  3. Check the integrity of the system loops
  4. Scan the system for additional error codes
  5. Test or replace the diagnostic unit

Related codes

B1000B1010B1020

FAQ

What does the B1111 code mean?

B1111 is an OBD-II diagnostic trouble code that indicates: Diagnosis Sensor Unit

What causes a B1111 error code?

The most common causes of B1111 include: Malfunction of the passive safety system diagnostic unit (malfunction); Problems with the wiring harness (harness) to the unit; Short circuit or open circuit; Low voltage in the on-board network.

How do I fix a B1111 diagnostic trouble code?

To fix B1111: Check the supply voltage of the diagnostic unit. Inspect the wiring harness for damage. Check the integrity of the system loops. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1111?

Do not drive — repair immediately

How much does it cost to fix B1111?

The estimated repair cost for B1111 is $167–333. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat