OBD Guide
ENFRDEESPT

B1122

Diagnosis Sensor Unit

B1122 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: $111–333.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$111–333 (est.)

Symptoms

  • The SRS indicator on the dashboard is on
  • The passive safety system does not activate in the event of an accident
  • Incorrect operation of shock or seat position sensors

Causes

  • Malfunction of the sensor diagnostic unit
  • Damage to the SRS wiring harness
  • Short circuit or open circuit in the sensor circuit
  • Software error in the SRS control unit

How to Fix

  1. Diagnose the SRS system using an OBD-II scanner
  2. Check the integrity of the wiring harness and connections
  3. Replace the faulty sensor diagnostic unit if necessary
  4. Reset the error and check the system operation

Related codes

B1121B1123B0100

FAQ

What does the B1122 code mean?

B1122 is an OBD-II diagnostic trouble code that indicates: Diagnosis Sensor Unit

What causes a B1122 error code?

The most common causes of B1122 include: Malfunction of the sensor diagnostic unit; Damage to the SRS wiring harness; Short circuit or open circuit in the sensor circuit; Software error in the SRS control unit.

How do I fix a B1122 diagnostic trouble code?

To fix B1122: Diagnose the SRS system using an OBD-II scanner. Check the integrity of the wiring harness and connections. Replace the faulty sensor diagnostic unit if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1122?

Do not drive — repair immediately

How much does it cost to fix B1122?

The estimated repair cost for B1122 is $111–333. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat