OBD Guide
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C123C

Sensor Cluster Mounting/Installation Performance

C123C is an OBD-II diagnostic trouble code meaning: Sensor Cluster Mounting/Installation Performance. Common causes: incorrect installation of sensors after repair, mechanical damage to sensors or mounts. Estimated repair cost: $56–222.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–222 (est.)

Symptoms

  • SRS/airbag indicator is on
  • Security system fault message on dashboard
  • Airbags may not deploy in a crash

Causes

  • Incorrect installation of sensors after repair
  • Mechanical damage to sensors or mounts
  • Contact corrosion
  • Wiring Harness Problems
  • Internal sensor fault
  • Trapped moisture

How to Fix

  1. Visual inspection of sensors and their mounts
  2. Checking the correct installation and position of the sensors
  3. Diagnostics of the condition of contacts and wiring harness
  4. Replace damaged sensors if necessary
  5. Resetting errors and checking the system
  6. Checking work after repair

Related codes

B0020B0021C123BC123D

FAQ

What does the C123C code mean?

C123C is an OBD-II diagnostic trouble code that indicates: Sensor Cluster Mounting/Installation Performance

What causes a C123C error code?

The most common causes of C123C include: Incorrect installation of sensors after repair; Mechanical damage to sensors or mounts; Contact corrosion; Wiring Harness Problems.

How do I fix a C123C diagnostic trouble code?

To fix C123C: Visual inspection of sensors and their mounts. Checking the correct installation and position of the sensors. Diagnostics of the condition of contacts and wiring harness. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C123C?

Do not drive — repair immediately

How much does it cost to fix C123C?

The estimated repair cost for C123C is $56–222. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat