U0309

Software Incompatibility With Alternative Fuel Control Module

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

~$56 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Unstable engine operation
Switching to emergency mode
Problems with switching between fuel types

Causes

Incompatible software update
Alternate Fuel Control Module Problems
Engine ECU malfunction
Damage to the wiring harness between modules
Incorrect system calibration

How to Fix

Check software versions of all related modules
Update or reinstall the software in accordance with the manufacturer's recommendations
Check the integrity of the wiring harness between the modules
Diagnose the alternative fuel control module
Calibrate the system after updating the software

Related codes

U0308 U0310 U0311