What does code P214B mean?

DTC codes / P21xx · Fuel and air metering / P214B

P214BSCR NOx Catalyst Inlet Temperature Too High During Particulate Filter Regeneration

P214B indicates that the inlet temperature of the selective catalytic reduction (SCR) nitrogen oxide (NOx) catalyst has exceeded the safe limit while the diesel particulate filter (DPF) is actively regenerating. The engine control module (ECM) monitors this temperature via a sensor and sets the code when the reading stays above the calibrated threshold for a specified time, protecting the SCR catalyst from thermal damage.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaFuel and air metering

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.