P2584
Fuel Additive Control Module Requested MIL Illumination
The fuel additive control module — typical for diesel cars with a separate Eolys/Cerine additive tank that aids DPF regeneration — has requested the ECM to illuminate the MIL because of an emissions-relevant fault on its side. The original fault is in the additive module itself.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Internal fault in the fuel additive module — read its DTCsCommon
Parts involved
- Fuel Additive Module
P2584 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.