U0309: Incompatibilidade de software com o módulo de controle do combustível alternativo
O que fazer
The car will most likely fall back to running on petrol or diesel and keep going. Nothing is broken.
This code means the computer controlling your gas or alternative fuel system and the car's engine computer are running software that does not belong together.
If your gas system was fitted after the car was built — which most are — go back to the installer rather than the main dealer. They fitted that module and hold its configuration, and a dealer updating the factory software again will not fix a mismatch on the aftermarket side.
And here is the commonest way this happens, with nobody at fault. The car went to a dealer, the engine software was updated under a service action or recall, and the conversion's computer was left on the version it was installed with. The two halves simply stopped matching. If the car has been to a dealer recently, mention it — that is very likely the whole story.
The practical cost is fuel rather than damage. The car is running on the fuel you converted away from, so this is worth sorting promptly for your wallet rather than for the engine.
If your car was built as a bi-fuel vehicle from the factory, this is a normal dealer programming job.
O que este código significa
A module is running software that does not belong with the alternative fuel control module's. See U0300 for the family and U0301 for why the named module is not the accused.
This code has one dominant cause that the rest of the family does not, and it is worth naming immediately: an aftermarket conversion.
LPG, CNG and dual-fuel systems are very often fitted after the vehicle was built, by a specialist rather than the manufacturer, and their control module has to sit alongside the factory engine module and agree with it about fuel type, injection timing and how the two fuel systems hand over. That agreement is software, on both sides.
So the commonest route into this code is a conversion whose module was never configured for a subsequent engine software update — the vehicle went to a dealer, the engine module was updated under a recall or a service action, and the conversion's module was left on the version it was installed with. Nobody did anything wrong; the two halves simply stopped matching.
Which is why the installer is usually the right first call rather than the dealer. They fitted the module, they hold its configuration, and a dealer updating the factory side again will not resolve a mismatch on the aftermarket side.
And there is a practical consequence worth stating. A conversion whose modules disagree normally falls back to the original fuel, which is safe and means the vehicle keeps running — but it is running on the fuel the owner converted away from, at the cost that motivated the conversion. That is an economic reason to fix it promptly rather than a mechanical one.
On a factory bi-fuel vehicle the usual family rules apply unchanged, and it is a dealer calibration job.
Causas prováveis
Comece aqui
- Equipamento instalado posteriormente não configurado · especializado
- Software atualizado em apenas um módulo · especializado
- Configuração do módulo errada após a substituição · especializado
Menos comum
- Emenda de fiação malfeita em instalação de terceiros · moderado
- Calibração de software desatualizada · especializado
- Módulo não codificado para o veículo · especializado
Sintomas
Componentes envolvidos
Informação, não instrução
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