U0409
Invalid Data Received From Alternative Fuel Control Module
U0409 is an OBD-II diagnostic trouble code meaning: Invalid Data Received From Alternative Fuel Control Module. Common causes: alternate fuel module malfunction, open or short circuit in the communication circuit. Estimated repair cost: $56–278.
Symptoms
- Check Engine light comes on
- Reduced engine power
- The car switches to the main type of fuel
- Increased fuel consumption
- Unstable engine operation
Causes
- Alternate fuel module malfunction
- Open or short circuit in the communication circuit
- Connector problems or contact corrosion
- Software error in ECU
- Module power problems
How to Fix
- Check the integrity of the wiring harness to the module
- Inspect and clean connector contacts
- Check the power supply and ground of the module
- Scan the module for additional error codes
- If necessary, replace the alternative fuel module
Related codes
Error U0409 by Vehicle Brand
FAQ
What does the U0409 code mean?
U0409 is an OBD-II diagnostic trouble code that indicates: Invalid Data Received From Alternative Fuel Control Module
What causes a U0409 error code?
The most common causes of U0409 include: Alternate fuel module malfunction; Open or short circuit in the communication circuit; Connector problems or contact corrosion; Software error in ECU.
How do I fix a U0409 diagnostic trouble code?
To fix U0409: Check the integrity of the wiring harness to the module. Inspect and clean connector contacts. Check the power supply and ground of the module. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0409?
Yes, but get it checked soon
How much does it cost to fix U0409?
The estimated repair cost for U0409 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat