C1A72 Lexus Code - Communication Error from FCM to Driving Support ECU
Quick Answer
If a communication error between the Driving Support ECU Assembly and Forward Recognition Camera is detected, Diagnostic Trouble Code (DTC) C1A72 is stored. Common causes include Faulty Controller Area Network (CAN) Communication System, Faulty Forward Recognition Camera, Faulty Driving Support ECU Assembly. 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
- C1A72 Lexus indicates Communication Error from FCM to Driving Support ECU.
- Common causes
- Common causes include Faulty Controller Area Network (CAN) Communication System, Faulty Forward Recognition Camera, Faulty Driving Support ECU Assembly.
- 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 C1A72 Lexus Description
What are the Possible Causes of the DTC C1A72 Lexus?
- Faulty Controller Area Network (CAN) Communication System
- Faulty Forward Recognition Camera
- Faulty Driving Support ECU Assembly
How to Fix the DTC C1A72 Lexus?
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.
Code Tech Notes
If the Forward Recognition Camera has been replaced with a new one, be sure to perform Forward Recognition Camera learning.
When replacing the Driving Support ECU Assembly, always replace it with a new one. If a Driving Support ECU Assembly which was installed in another vehicle is used, the information stored in the Driving Support ECU Assembly will not match the information from the vehicle. As a result, a DTC may be stored.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the C1A72 Lexus 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.
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Frequently Asked Questions about C1A72 Lexus Code
1. What does the OBDII code C1A72 mean on a Lexus?
The code C1A72 indicates a "Communication Error from FCM to Driving Support ECU," meaning there is a problem with the communication between the Forward Control Module (FCM) and the Driving Support ECU.
2. What are the common symptoms of code C1A72 on a Lexus?
Symptoms may include warning lights on the dashboard (e.g., PCS, LDA, or cruise control warnings), malfunctioning advanced driver-assistance systems, or the inability to use features like adaptive cruise control.
3. What causes the C1A72 code to appear?
Common causes include faulty wiring or connectors, a malfunctioning Forward Control Module (FCM), a defective Driving Support ECU, or software glitches in the communication system.
4. Can I still drive my Lexus with the C1A72 code?
While the car may still be drivable, advanced safety and driver-assistance systems may not function properly, increasing the risk of accidents. It’s best to address the issue promptly.
5. How can I diagnose the C1A72 code on my Lexus?
Use an OBDII scanner to confirm the code, then inspect wiring and connectors between the FCM and Driving Support ECU for damage. Further diagnosis may require checking the modules themselves or consulting a professional.
6. Is the C1A72 code a common issue in Lexus vehicles?
It’s not extremely common but can occur, particularly in models with advanced driver-assistance systems. Regular maintenance and software updates can help prevent it.
7. How much does it cost to fix the C1A72 code on a Lexus?
Repair costs vary depending on the issue. Fixing damaged wiring may cost $100-$300, while replacing a module, such as the FCM or Driving Support ECU, could cost $500-$1,500 or more.
8. Can a reset clear the C1A72 code on a Lexus?
A temporary reset might clear the code, but if the underlying issue isn’t fixed, the code will likely return. Proper diagnosis and repair are necessary.
9. Do I need to replace the Forward Control Module (FCM) to fix the C1A72 code?
Not necessarily. The FCM should only be replaced if it’s confirmed to be faulty after diagnosis. The issue could also stem from wiring, connectors, or the Driving Support ECU.
10. Can a software update fix the C1A72 code on a Lexus?
In some cases, a software update for the vehicle's control modules may resolve communication errors. Check with your Lexus dealer to see if updates are available.
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