P243CParticulate Filter Regeneration Frequency (Bank 2)
- 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
- P243C is stored when the bank 2 particulate filter needs regeneration more often than its calibration allows. CARB requires diesel OBD to recognise regeneration so frequent that emissions would rise above the limit. No manufacturer documents this bank 2 code publicly, so the bank 1 code P2459 serves as the reference: Ford's 2023 diesels flag it once completed regenerations occur, on average, less than roughly 40 km apart. Excess soot from the engine side of that bank, for example a leaking injector, an EGR or boost fault, or a pressure reading that overstates the load, makes the filter look full too early. Every extra regeneration burns fuel and can thin the engine oil. If the other bank regenerates at normal intervals, compare what differs on this side.
- What you may notice
- Regeneration running unusually often
- Higher fuel consumption, rising oil level
- MIL on
- Likely causes
- LikelyToo much soot from bank 2 cylinders (injector, EGR or boost fault)
- PossiblePressure sensor or hose overstating the bank 2 soot load
- PossibleFilter partly filled with ash, leaving little soot capacity
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.