P2585
Fuel Additive Control Module Warning Lamp Request
Fuel additive (DPF dosing) system
Generic OBD-II
Low
What it means
P2585 means the fuel-additive control module has requested a warning lamp. On diesels that dose a fluid additive to help the particulate filter burn off soot, this usually means the additive fluid is low or the dosing system has a fault. It is an informational request rather than an engine problem, but the additive system should be serviced so the filter keeps regenerating effectively.
Low
Can I keep driving? Safe to drive; service the additive system so the particulate filter keeps regenerating properly.
Common symptoms
What you'll notice
- Warning lamp or check-engine light on
- Low fuel-additive fluid message
- Less effective DPF regeneration if left unaddressed
- No engine-running symptom
Common causes
Most likely first
- Low additive (dosing) fluid levelLikely
- Faulty additive-fluid level sensorCommon
- Additive pump or dosing faultCommon
- Wiring or communication fault to the additive moduleLess often
How to diagnose & fix
Work through it in order
- Check the fuel-additive fluid level and top up or service per the maker's procedure.
- Read codes from the fuel-additive control module.
- Inspect the dosing pump and level sensor.
- Check the wiring and communication link to the additive module.
- Reset the additive counter after the system is serviced.
FAQ
Quick answers
Is it safe to drive with P2585?+
Yes in the short term, but the additive helps the particulate filter regenerate. Refill or service it so the DPF doesn't clog over time.
Can I just clear P2585?+
It returns until the additive system is refilled or repaired and the counter is reset.
Related codes
Often seen with P2585
Read & clear P2585 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX