P214BSCR NOx Catalyst Inlet Temperature Too High During Particulate Filter Regeneration
- 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
- P214B is limited to the regeneration phase. To burn soot out of the particulate filter, the engine control adds late injections or uses a separate exhaust fuel injector, and the oxidation catalyst converts that fuel into heat. The code sets when the gas leaving this hot zone arrives at the SCR inlet above the limit allowed during regeneration. Navistar's patent US20190232224 describes exactly this conflict: repeated regenerations push vanadium SCR material towards its sublimation point near 550 °C, so the layout and temperature control must keep the SCR below it. No manufacturer documents P214B publicly. Compared with P214A, suspicion falls on regeneration control: a dripping exhaust injector, excess post-injection or soot burning too fast. The control unit usually aborts the regeneration.
- What you may notice
- Check engine light on, regeneration aborted
- Filter warning or rising soot load because regeneration cannot finish
- Reduced engine power
- Likely causes
- LikelyExhaust fuel injector leaking or over-dosing during regeneration
- PossibleHeavily loaded filter burning off too quickly
- PossibleExcess post-injection quantity from a worn engine injector
- RareExhaust temperature sensor upstream of the SCR reading too high
- 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: €150 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.