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U0409: Invalid Data Received From Alternative Fuel Control Module

What Does U0409 Mean?

U0409 is a diagnostic trouble code indicating: Invalid Data Received From Alternative Fuel Control Module. This code relates to the network communication system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

What To Do Next

  1. 1
    Find your vehicle above

    Click your make and model for real owner reports and common causes specific to your vehicle.

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

Related Codes

U0404 Invalid Data Received From Gear Shift Control Module A U0405 Invalid Data Received From Cruise Control Module U0406 Invalid Data Received From Fuel Injector Control Module U0407 Invalid Data Received From Glow Plug Control Module 1 U0408 Invalid Data Received From Throttle Actuator A Control Module U0410 Invalid Data Received From Fuel Pump Control Module A U0411 Invalid Data Received From Drive Motor Control Module A U0412 Invalid Data Received From Battery Energy Control Module A