OBD Guide
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C1AA2

Vehicle Speed Tolerance Malfunction

C1AA2 is an OBD-II diagnostic trouble code meaning: Vehicle Speed Tolerance Malfunction. Common causes: wheel speed sensor malfunction, transmission output speed sensor malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Incorrect speedometer readings
  • Incorrect operation of cruise control
  • Disabling the ESP system
  • Unstable gear shifting

Causes

  • Wheel speed sensor malfunction
  • Transmission output speed sensor malfunction
  • Problems with the wiring harness (breaks, oxidation of contacts)
  • ABS or ESP malfunction
  • ECU software error

How to Fix

  1. Check the operation of speed sensors using an OBD-II scanner
  2. Inspect the wiring harness for damage
  3. Check sensor contacts for oxidation
  4. Program or replace the ECU if necessary

Related codes

C1AA1C1AA3P0500U0121

FAQ

What does the C1AA2 code mean?

C1AA2 is an OBD-II diagnostic trouble code that indicates: Vehicle Speed Tolerance Malfunction

What causes a C1AA2 error code?

The most common causes of C1AA2 include: Wheel speed sensor malfunction; Transmission output speed sensor malfunction; Problems with the wiring harness (breaks, oxidation of contacts); ABS or ESP malfunction.

How do I fix a C1AA2 diagnostic trouble code?

To fix C1AA2: Check the operation of speed sensors using an OBD-II scanner. Inspect the wiring harness for damage. Check sensor contacts for oxidation. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1AA2?

Do not drive — repair immediately

How much does it cost to fix C1AA2?

The estimated repair cost for C1AA2 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat