P214ASCR NOx Catalyst Inlet Temperature Too High
- 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
- P214A reports that the exhaust entering the SCR catalyst was hotter than a calibrated ceiling while no particulate filter regeneration was active. The reading normally comes from the temperature sensor between the filter and the urea mixing section. Heat at this point is a threat to the SCR coating: Navistar's patent US20190232224 states that vanadia sublimates above roughly 550 °C, and 40 CFR 1036.115 obliges heavy-duty engine makers to shield vanadium catalysts from such temperatures. No manufacturer documents P214A publicly; Ram bulletins for the 6.7L Cummins name only the sibling P214D, and Ford flags aftertreatment overheating with P200C/P200E. P214B covers the same fault during regeneration, P214C the outlet side. Typical triggers are fuel or oil in the exhaust, overfuelling or a drifting sensor.
- What you may notice
- Check engine light on
- Reduced engine power to limit exhaust temperature
- Further codes for exhaust temperature or SCR efficiency
- Likely causes
- LikelyUnburnt fuel or engine oil reaching the exhaust (leaking injector, turbocharger seal)
- PossibleSCR inlet temperature sensor reading too high or wrongly placed after repair
- PossibleOverfuelling from injection or air-path faults (boost leak, EGR fault)
- RareEngine control software with outdated temperature model
- 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.