AutoCodes – Toyota – C1AA1 Toyota

C1AA1 Toyota Code - FCM Destination Information Unmatched

Quick Answer

For vehicles with Lane Departure Alert System: When the Lane Departure Warning Camera is replaced with a new one, it acquires the country specification information from the Main Body ECU (Multiplex Network Body ECU). Common causes include Faulty Lane Departure Warning Camera (For vehicles with Lane Departure Alert System), Faulty Forward Recognition Camera, Faulty Main Body ECU (Multiplex Network Body ECU). Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: C1AA1 Toyota indicates FCM Destination Information Unmatched.
Common causes: Common causes include Faulty Lane Departure Warning Camera (For vehicles with Lane Departure Alert System), Faulty Forward Recognition Camera, Faulty Main Body ECU (Multiplex Network Body ECU).
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,456

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 05, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code C1AA1 Toyota Description

For vehicles with Lane Departure Alert System: When the Lane Departure Warning Camera is replaced with a new one, it acquires the country specification information from the Main Body ECU (Multiplex Network Body ECU). When the country specification information in the Lane Departure Warning Camera and Main Body ECU (Multiplex Network Body ECU) do not match, the Diagnostic Trouble Code (DTC) C1AA1 is stored.

For vehicles with Forward Recognition Camera System: When the Forward Recognition Camera is replaced with a new one, it stores country specification information received from the Main Body ECU (Multiplex Network Body ECU). If the country specification information stored in the Forward Recognition Camera is different from that stored in the Main Body ECU (Multiplex Network Body ECU), the DTC C1AA1 is stored.

For vehicles with Lane Departure Alert System (W/ Steering Control): When the Forward Recognition Camera is replaced with a new one, the new Forward Recognition Camera attempts to store country specification information received from the Main Body ECU (Multiplex Network Body ECU) and Engine Control Module (ECM). If the country specification information stored in the Forward Recognition Camera is different from that stored in the Main Body ECU (Multiplex Network Body ECU) or ECM, the DTC C1AA1 is stored.

OBDII Code C1AA1 Toyota - FCM Destination Information Unmatched - AutoCodes.com — C1AA1 Toyota Code - FCM Destination Information Unmatched

What does this mean?

What are the Possible Causes of the DTC C1AA1 Toyota?

Faulty Lane Departure Warning Camera (For vehicles with Lane Departure Alert System)
Faulty Forward Recognition Camera
Faulty Main Body ECU (Multiplex Network Body ECU)
Faulty Engine Control Module (ECM) (Lane Departure Alert System (W/ Steering Control))

How to Fix the DTC C1AA1 Toyota?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1AA1 Toyota code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the C1AA1 Toyota code?

Need more information on how to fix the C1AA1 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1AA1 Toyota code diagnosed by a professional: Find a repair shop in your area

Information for Specific Toyota Models

C1AA1 2013 Toyota RAV4 — FCM Destination Information Unmatched
C1AA1 2014 Toyota RAV4 — FCM Destination Information Unmatched
C1AA1 2015 Toyota RAV4 — FCM Destination Information Unmatched
C1AA1 2016 Toyota RAV4 — FCM Destination Information Unmatched
C1AA1 2017 Toyota RAV4 — FCM Destination Information Unmatched
C1AA1 2018 Toyota RAV4 — FCM Destination Information Unmatched

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C1AA1 Toyota Code

1. What does the OBDII code C1AA1 mean on a Toyota?

The C1AA1 code indicates "FCM Destination Information Unmatched," meaning there is a mismatch or error in the configuration of the Forward Collision Mitigation (FCM) system's destination information.

2. What are the common symptoms of the C1AA1 code?

Symptoms may include the Forward Collision Mitigation (FCM) or Pre-Collision System (PCS) being inoperative, warning lights on the dashboard, and possible error messages related to safety systems.

3. What causes the C1AA1 code to appear?

The code is typically caused by incorrect programming or configuration of the FCM system, mismatched software or hardware components, or an error during system updates.

4. Can a faulty sensor trigger the C1AA1 code?

No, this code is not usually caused by a faulty sensor. It is related to software mismatches or configuration issues rather than sensor hardware.

5. How do you diagnose the C1AA1 code in a Toyota vehicle?

Diagnose the code by using a scan tool to check for related codes, verifying the FCM system's configuration, and ensuring the software version and destination settings match the vehicle's specifications.

6. What is the first step in fixing the C1AA1 code?

The first step is to ensure the FCM system's destination settings and software version are correctly configured for the specific Toyota model and region.

7. Can the C1AA1 code be fixed without professional help?

In most cases, professional assistance is recommended because reprogramming the FCM system requires specialized diagnostic tools and knowledge of Toyota's software configurations.

8. Will the C1AA1 code affect the vehicle's drivability?

While it may not directly affect drivability, the code can disable critical safety systems like the Pre-Collision System (PCS), which could compromise safety.

9. Is it safe to drive with the C1AA1 code active?

Driving is possible, but it is not recommended as the Forward Collision Mitigation system may be inoperative, reducing the vehicle's safety features.

10. How much does it cost to fix the C1AA1 code on a Toyota?

The cost varies depending on the dealership or repair shop, but it generally involves diagnostic labor and possibly reprogramming fees, typically ranging from $100 to $300.