OBD Guide
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C1234

Right Front Wheel Speed Sensor Input Signal Missing

C1234 is an OBD-II diagnostic trouble code meaning: Right Front Wheel Speed Sensor Input Signal Missing. Common causes: wheel speed sensor malfunction, open or shorted wiring harness. Estimated repair cost: $33–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–89 (est.)

Symptoms

  • ABS light is on
  • Disabling the stabilization system
  • Incorrect speedometer readings (on some models)

Causes

  • Wheel speed sensor malfunction
  • Open or shorted wiring harness
  • Poor contact in the sensor connector
  • Damage to the ring gear on the hub

How to Fix

  1. Check the integrity of the sensor wiring harness
  2. Clean sensor connector contacts
  3. Check the sensor resistance (compare with the norm)
  4. Inspect the ring gear on the hub
  5. If necessary, replace the sensor or wiring harness

Related codes

C1235C1236C1237

FAQ

What does the C1234 code mean?

C1234 is an OBD-II diagnostic trouble code that indicates: Right Front Wheel Speed Sensor Input Signal Missing

What causes a C1234 error code?

The most common causes of C1234 include: Wheel speed sensor malfunction; Open or shorted wiring harness; Poor contact in the sensor connector; Damage to the ring gear on the hub.

How do I fix a C1234 diagnostic trouble code?

To fix C1234: Check the integrity of the sensor wiring harness. Clean sensor connector contacts. Check the sensor resistance (compare with the norm). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1234?

Limited driving only, diagnose soon

How much does it cost to fix C1234?

The estimated repair cost for C1234 is $33–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat