C123B
ESP System Control Too Long
C123B is an OBD-II diagnostic trouble code meaning: ESP System Control Too Long. Common causes: malfunction of wheel speed sensors, problems with esp wiring harness. Estimated repair cost: $33–167.
Symptoms
- ESP/ABS indicator is on
- Unstable operation of the stabilization system
- The car loses control when cornering
Causes
- Malfunction of wheel speed sensors
- Problems with ESP wiring harness
- ESP control unit malfunction
- Corroded or damaged connectors
How to Fix
- Diagnose the ESP and ABS system using a scanner
- Check wheel speed sensors and their connectors
- Inspect the wiring harness for damage
- If necessary, replace faulty components or the entire control unit
Related codes
FAQ
What does the C123B code mean?
C123B is an OBD-II diagnostic trouble code that indicates: ESP System Control Too Long
What causes a C123B error code?
The most common causes of C123B include: Malfunction of wheel speed sensors; Problems with ESP wiring harness; ESP control unit malfunction; Corroded or damaged connectors.
How do I fix a C123B diagnostic trouble code?
To fix C123B: Diagnose the ESP and ABS system using a scanner. Check wheel speed sensors and their connectors. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C123B?
Do not drive — repair immediately
How much does it cost to fix C123B?
The estimated repair cost for C123B is $33–167. Actual cost depends on your vehicle, location, and labor rates.
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