Powertrain, generic (extended)

P214D SCR NOx Catalyst Outlet Temperature Too High During Particulate Filter Regeneration

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P214D sets when the temperature behind the SCR catalyst exceeds its limit while the particulate filter is regenerating. It is the only code of this group with public manufacturer evidence. Ram pickups with the 6.7L Cummins use it: bulletin 18-053-14 (2014 Ram 2500/3500) reprograms the PCM partly to prevent unnecessary MIL events from P214D, and STAR case S2625000004 (2025–2026 Ram 3500 to 5500) groups it with exhaust temperature sensor codes such as P242B and P2470–P2472, asks for a check of battery voltage first and stresses identifying each sensor by name. That points to sensor faults and calibration as frequent causes, besides genuine overheating from hydrocarbons burning on the hot SCR during regeneration. P214B is the inlet counterpart.

Likely causes

Exhaust temperature sensor behind the SCR faulty, confused with another sensor or affected by low battery voltage
PCM software requiring an update (Ram 6.7L bulletins)
Regeneration fuel slipping through and burning on the SCR

Symptoms

  • Check engine light on
  • Regeneration aborted or repeated
  • Additional exhaust temperature sensor codes

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–2,500
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

scr catalystexhaust gas temperature sensor

Related codes

P214CP214BP214AP242BP2471P0544

References: static.nhtsa.gov, static.nhtsa.gov, patents.google.com.