P2465Diesel Particulate Filter Differential Pressure Too High (Bank 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2465 means the second particulate filter builds up more back pressure than the controller accepts for the exhaust flow it calculates. The code is only possible where each cylinder bank has its own filter. No maker documents the bank 2 version in a public table; its bank 1 twin P244B gives the logic. On GM's 3.0 L LZO that check also reacts to a loose or leaking downstream pipe, comparing either the downstream pressure or the pressure-to-flow ratio, and it is a Type A fault there. CARB asks for monitoring that recognises a filter loaded so heavily that it endangers the engine. Typical findings are a filter packed with soot or ash, a plugged rear hose, a dented pipe or a sensor reading too high. A soot-model warning without a pressure test is P243F, and the stage with forced power reduction on this bank is P243B.
- What you may notice
- MIL on
- Frequent or prolonged regeneration attempts
- Loss of power, possibly limp mode
- Likely causes
- LikelyBank 2 filter heavily loaded with soot or ash
- PossibleDownstream sensing hose blocked, kinked or swapped
- RareDented or obstructed exhaust pipe behind the filter
- RareDifferential pressure sensor drifting high
- 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 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.