P214B
SCR NOx Catalyst Inlet Temperature Too High During Particulate Filter Regeneration
SCR NOx Catalyst Inlet Temperature Too High During Particulate Filter Regeneration: the component is overheating, typically from extended load or slip.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Symptoms
- Check engine light on
- Failed emissions inspection
- Possibly slightly increased fuel consumption
- Sulfur (rotten egg) smell from exhaust under load
Common causes
Ordered by how often each turns out to be the cause.
- HC dosing overshot during regenerationCommon
Parts involved
- SCR Catalyst
- Aftertreatment Fuel Injector
P214B is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.