C1AA1 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 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.
Code C1AA1 Description
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.
What are the Possible Causes of the DTC C1AA1?
- 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?
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 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 code?
Need more information on how to fix the C1AA1 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the C1AA1 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- C1AA1 Lexus — FCM Destination Information Unmatched
- C1AA1 Toyota — FCM Destination Information Unmatched
Frequently Asked Questions about C1AA1 Code
1. What does the OBDII code C1AA1 mean?
C1AA1 indicates a fault where the Forward Collision Mitigation (FCM) system detects unmatched or inconsistent destination information in its data communication.
2. What are the common symptoms of code C1AA1?
Symptoms may include the FCM system being disabled, warning lights on the dashboard, or a message indicating a malfunction in the collision mitigation system.
3. What causes the C1AA1 code to appear?
This code is often triggered by mismatched calibration data, incorrect FCM module programming, or communication issues between the FCM system and other vehicle modules.
4. Can I drive with the C1AA1 code active?
Yes, but it is not recommended, as the FCM system may not function properly, reducing the vehicle's ability to mitigate forward collisions.
5. How is the C1AA1 code diagnosed?
A technician will use a diagnostic scanner to read the code, check for communication errors, and verify the calibration and programming of the FCM system.
6. What repairs are needed for the C1AA1 code?
Repairs may involve recalibrating the FCM system, updating software, or inspecting and fixing wiring and connector issues.
7. Can a low battery cause the C1AA1 code?
Yes, a weak or low battery can sometimes disrupt communication between modules and trigger this code.
8. How much does it cost to fix the C1AA1 code?
Repair costs vary, but recalibration or software updates typically cost between $100 and $300, while more extensive repairs may cost more.
9. Will clearing the C1AA1 code solve the issue?
Clearing the code without addressing the underlying problem will not fix the issue; the code is likely to return.
10. Can I fix the C1AA1 code myself?
If you have the proper tools and knowledge to recalibrate or update the FCM system, you may attempt it, but this is usually best handled by a professional.
Discuss the causes and fixes for C1AA1 OBDII Code
Code C1AA1 comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
