OBD Guide
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B1123

Diagnosis Sensor Unit

B1123 is an OBD-II diagnostic trouble code meaning: Diagnosis Sensor Unit. Common causes: malfunction of the srs diagnostic unit, problems with the system wiring harness. Estimated repair cost: $56–333.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–333 (est.)

Symptoms

  • Airbag light is on
  • Disabling SRS
  • Lack of system response when checking with a scanner

Causes

  • Malfunction of the SRS diagnostic unit
  • Problems with the system wiring harness
  • Short circuit or open circuit
  • Contact corrosion
  • Module firmware failure

How to Fix

  1. Read full error codes with SRS scanner
  2. Check the power and ground of the diagnostic module
  3. Inspect the wiring harness for damage
  4. Check connector contacts for oxidation
  5. If necessary, replace the diagnostic unit
  6. Reset errors and check the system

Related codes

B1000B1124B1153

FAQ

What does the B1123 code mean?

B1123 is an OBD-II diagnostic trouble code that indicates: Diagnosis Sensor Unit

What causes a B1123 error code?

The most common causes of B1123 include: Malfunction of the SRS diagnostic unit; Problems with the system wiring harness; Short circuit or open circuit; Contact corrosion.

How do I fix a B1123 diagnostic trouble code?

To fix B1123: Read full error codes with SRS scanner. Check the power and ground of the diagnostic module. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1123?

Limited driving only, diagnose soon

How much does it cost to fix B1123?

The estimated repair cost for B1123 is $56–333. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat