OBD Guide
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C1AA1

FCM Destination Information Unmatched

C1AA1 is an OBD-II diagnostic trouble code meaning: FCM Destination Information Unmatched. Common causes: fcm software failure, wiring harness damage. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Incorrect operation of the collision avoidance system
  • False alarms of the system
  • The malfunction indicator on the dashboard lights up

Causes

  • FCM software failure
  • Wiring harness damage
  • FCM module malfunction
  • Problems connecting to the CAN bus

How to Fix

  1. Check wiring harness for damage
  2. Check FCM connections
  3. Update or reflash module software
  4. Replace FCM if necessary

Related codes

C1AA0C1AA2U0121

FAQ

What does the C1AA1 code mean?

C1AA1 is an OBD-II diagnostic trouble code that indicates: FCM Destination Information Unmatched

What causes a C1AA1 error code?

The most common causes of C1AA1 include: FCM software failure; Wiring harness damage; FCM module malfunction; Problems connecting to the CAN bus.

How do I fix a C1AA1 diagnostic trouble code?

To fix C1AA1: Check wiring harness for damage. Check FCM connections. Update or reflash module software. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1AA1?

Limited driving only, diagnose soon

How much does it cost to fix C1AA1?

The estimated repair cost for C1AA1 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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