P0619: Alternative Fuel Control Module RAM/ROM Error
What to do
Should revert to petrol and remain driveable. Take it to the conversion installer or a gas specialist — general workshops rarely have tooling for aftermarket fuel systems.
What this code means
A memory fault inside the alternative fuel control module — its working or program memory rather than its learned settings. As with the engine module's equivalents, this is an internal fault rather than something a sensor test will find.
The vehicle normally falls back to petrol operation, so it stays usable while the gas system is repaired.
Likely causes
Start here
- Failed alternative fuel control module · specialist
Less common
- Corrupted module software · specialist
- Low system voltage disrupting communication · moderate
- Water ingress into module · specialist
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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