OBD Guide
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C1A45

Vehicle Speed Sensor

C1A45 is an OBD-II diagnostic trouble code meaning: Vehicle Speed Sensor. Common causes: speed sensor malfunction, open or shorted wiring harness. Estimated repair cost: $11–56.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$11–56 (est.)

Symptoms

  • Incorrect operation of the speedometer
  • No speed readings on the dashboard
  • Problems with gear shifting (automatic transmission)
  • Disabling cruise control
  • Check Engine Light Illuminates

Causes

  • Speed sensor malfunction
  • Open or shorted wiring harness
  • Poor contact in the sensor connector
  • Mechanical damage to the sensor
  • ECU malfunction

How to Fix

  1. Check the integrity of the sensor and its fastening
  2. Check the condition of the wiring harness and connectors
  3. Measure the sensor resistance (compare with the norm)
  4. Check the sensor signal with an oscilloscope or multimeter
  5. Replace sensor if necessary

Related codes

P0500P0501P0502P0503

FAQ

What does the C1A45 code mean?

C1A45 is an OBD-II diagnostic trouble code that indicates: Vehicle Speed Sensor

What causes a C1A45 error code?

The most common causes of C1A45 include: Speed sensor malfunction; Open or shorted wiring harness; Poor contact in the sensor connector; Mechanical damage to the sensor.

How do I fix a C1A45 diagnostic trouble code?

To fix C1A45: Check the integrity of the sensor and its fastening. Check the condition of the wiring harness and connectors. Measure the sensor resistance (compare with the norm). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1A45?

Limited driving only, diagnose soon

How much does it cost to fix C1A45?

The estimated repair cost for C1A45 is $11–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat