P246BVehicle Conditions Incorrect for Particulate Filter Regeneration
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P246B says the controller wanted to clean the particulate filter but the vehicle did not offer the conditions its strategy needs, for example enough exhaust heat, a long enough run or a functioning air path. It describes a failed or blocked regeneration request rather than a defective part on its own, so the real cause is usually stored beside it. Land Rover documents exactly that on Range Rover and Range Rover Sport 2016–2018 and Discovery 2017–2018 with the 3.0 L TDV6: P246B-00 and P2463-00 can accompany P0234-77 when the intake air shutoff throttle has failed, and bulletins LTB01204NAS1 to NAS3 call for a new throttle followed by a dynamic regeneration. Short trips and long idling make it worse, and if soot keeps rising P2463 or a power limit follows. MIL behaviour differs by maker.
- What you may notice
- Regeneration does not start or is aborted repeatedly
- Filter warning or rising soot load
- MIL on together with the root-cause code on some vehicles
- Likely causes
- LikelyAnother stored fault (e.g. intake throttle, sensors) blocking regeneration
- PossibleFailed intake air shutoff throttle (Land Rover TDV6)
- PossibleShort trips or long idling without enough exhaust heat
- 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: €0 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.