C1A72
Communication Error from FCM to Driving Support ECU
C1A72 is an OBD-II diagnostic trouble code meaning: Communication Error from FCM to Driving Support ECU. Common causes: open or damaged wiring harness between fcm and driving support ecu, headlamp control module (fcm) malfunction. Estimated repair cost: $56–167.
Symptoms
- Incorrect operation of driver assistance systems
- Error message on the dashboard
- Disabling adaptive cruise control
- Problems with automatic headlight switching
Causes
- Open or damaged wiring harness between FCM and Driving Support ECU
- Headlamp control module (FCM) malfunction
- Problems with power supply to one of the modules
- Malfunction of the driver assistance systems control unit
- Problems with the CAN bus
How to Fix
- Check the integrity of the wiring harness between the FCM and Driving Support ECU
- Inspect connectors for oxidation or damage
- Check power and ground on both modules
- Scan other modules for related errors
- If necessary, replace the faulty module or restore the wiring harness
Related codes
FAQ
What does the C1A72 code mean?
C1A72 is an OBD-II diagnostic trouble code that indicates: Communication Error from FCM to Driving Support ECU
What causes a C1A72 error code?
The most common causes of C1A72 include: Open or damaged wiring harness between FCM and Driving Support ECU; Headlamp control module (FCM) malfunction; Problems with power supply to one of the modules; Malfunction of the driver assistance systems control unit.
How do I fix a C1A72 diagnostic trouble code?
To fix C1A72: Check the integrity of the wiring harness between the FCM and Driving Support ECU. Inspect connectors for oxidation or damage. Check power and ground on both modules. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C1A72?
Limited driving only, diagnose soon
How much does it cost to fix C1A72?
The estimated repair cost for C1A72 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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