P2584Fuel Additive Control Module Requested MIL Illumination
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2584 belongs to diesel cars that add a fuel-borne catalyst to the tank so the particulate filter can burn off soot at lower exhaust temperatures. A separate additive module meters the fluid after each refuelling, in proportion to fuel added, and watches its pump, level sensor and its own circuits. If it finds an emission-relevant fault, it asks the engine module, which owns the lamp, to switch on the MIL; the engine module stores P2584 as a pointer. The approach goes back to PSA, whose 607 sedan, as presented in 1999, used Rhodia's cerium-based Eolys with on-board dosing. No manufacturer documents P2584 publicly. The real cause sits in the additive module: empty reservoir, failed dosing pump, lost refill count or wiring. Without dosing, regenerations fail and the filter clogs.
- What you may notice
- Check engine lamp on
- Particulate filter warning, regenerations incomplete
- Loss of power as soot load rises
- Likely causes
- LikelyAdditive reservoir empty or level sensor faulty
- PossibleAdditive dosing pump or injector failed
- PossibleAdditive module wiring, supply or CAN link faulty
- RareAdditive quantity counter not reset after refill or filter change
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.