OBD Guide
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C1AA3

Vehicle Speed Sensor Circuit

C1AA3 is an OBD-II diagnostic trouble code meaning: Vehicle Speed Sensor Circuit. Common causes: open or short circuit in the speed sensor wiring harness, malfunction of the speed sensor itself. Estimated repair cost: $33–89.

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

Symptoms

  • Incorrect speedometer readings
  • Problems with gear shifting in automatic transmission
  • Check Engine Light Is On
  • Activating emergency engine operation

Causes

  • Open or short circuit in the speed sensor wiring harness
  • Malfunction of the speed sensor itself
  • Poor contact in the sensor connector
  • Problems with the ECU

How to Fix

  1. Check the integrity of the speed sensor wiring harness
  2. Check the contacts in the sensor connector
  3. Check the resistance of the speed sensor (compare with the standards)
  4. Replace the speed sensor if necessary
  5. Check the operation of the system after repair

Related codes

C1AA4P0500P0501P0502

FAQ

What does the C1AA3 code mean?

C1AA3 is an OBD-II diagnostic trouble code that indicates: Vehicle Speed Sensor Circuit

What causes a C1AA3 error code?

The most common causes of C1AA3 include: Open or short circuit in the speed sensor wiring harness; Malfunction of the speed sensor itself; Poor contact in the sensor connector; Problems with the ECU.

How do I fix a C1AA3 diagnostic trouble code?

To fix C1AA3: Check the integrity of the speed sensor wiring harness. Check the contacts in the sensor connector. Check the resistance of the speed sensor (compare with the standards). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1AA3?

Limited driving only, diagnose soon

How much does it cost to fix C1AA3?

The estimated repair cost for C1AA3 is $33–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat