OBD Guide
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C1233

Left Front Wheel Speed Sensor Input Signal Missing

C1233 is an OBD-II diagnostic trouble code meaning: Left Front Wheel Speed Sensor Input Signal Missing. Common causes: open or shorted sensor wiring harness, wheel speed sensor malfunction. Estimated repair cost: $33–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–167 (est.)

Symptoms

  • The ABS indicator on the dashboard is on
  • Disabling the ABS system
  • Possible false alarms of the stabilization system (if any)

Causes

  • Open or shorted sensor wiring harness
  • Wheel speed sensor malfunction
  • Damage or oxidation of the sensor connector
  • Problems with the gear ring (dirt, damage)
  • ABS module malfunction

How to Fix

  1. Check the integrity of the sensor wiring harness
  2. Inspect the sensor connector for damage and oxidation.
  3. Check sensor resistance (usually 800-2500 Ohm)
  4. Clean the toothed ring from dirt
  5. If necessary, replace the wheel speed sensor

Related codes

C1234C1235C1236

FAQ

What does the C1233 code mean?

C1233 is an OBD-II diagnostic trouble code that indicates: Left Front Wheel Speed Sensor Input Signal Missing

What causes a C1233 error code?

The most common causes of C1233 include: Open or shorted sensor wiring harness; Wheel speed sensor malfunction; Damage or oxidation of the sensor connector; Problems with the gear ring (dirt, damage).

How do I fix a C1233 diagnostic trouble code?

To fix C1233: Check the integrity of the sensor wiring harness. Inspect the sensor connector for damage and oxidation.. Check sensor resistance (usually 800-2500 Ohm). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1233?

Limited driving only, diagnose soon

How much does it cost to fix C1233?

The estimated repair cost for C1233 is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat