What are the common causes of P0619?

An internal memory fault in the alternative fuel module. Corrupted alternative fuel module firmware. Low battery voltage or a voltage spike. A poor module ground. A failed alternative fuel control module.

Check battery voltage and the module ground. Inspect the module connectors for corrosion. Scan the module for other memory codes. Reflash the alternative fuel module firmware. Replace the module if the memory fault returns. Clear the code and retest.

P0619

Alternative Fuel Control Module RAM/ROM Error

System: Computer output circuits (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P0619 means Alternative Fuel Control Module RAM/ROM Error.

Where it lives

For P0619, the part to look at first is the module named here.

Check these first

An internal memory fault in the alternative fuel module
Corrupted alternative fuel module firmware
Low battery voltage or a voltage spike
A poor module ground
A failed alternative fuel control module

What to do next

Check battery voltage and the module ground
Inspect the module connectors for corrosion
Scan the module for other memory codes
Reflash the alternative fuel module firmware
Replace the module if the memory fault returns
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.