OBD-II code · Powertrain (generic, extended)
P2585 Fuel Additive Control Module Warning Lamp Request
The fuel additive control module asks for the additive-low warning lamp to be illuminated — the additive tank (Eolys/Cerine, used to lower DPF regen temperature) is approaching empty or has reached a service threshold. Continued driving without refilling will eventually disable DPF regeneration.
Is it safe to drive with P2585?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyAdditive tank low — service refill required
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–1.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Fuel Additive Tank
Related codes
- P2584Fuel Additive Control Module Requested MIL Illumination
- P2582Turbocharger/Supercharger Speed Sensor A Circuit Intermittent
- P2583Cruise Control Front Distance Range Sensor Single Sensor or Center
- P2586Turbocharger Boost Control Position Sensor B Circuit
- P2587Turbocharger Boost Control Position Sensor B Circuit Range/Performance
- P2588Turbocharger Boost Control Position Sensor B Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.