What does code P246F mean?

Q: What does code P246F mean?

Reductant System Cold Start Performance. P246F indicates that the reductant system, which injects diesel exhaust fluid (DEF) into the exhaust to reduce nitrogen oxides (NOx), did not achieve the expected performance during a cold start. The engine control module (ECM) monitors NOx reduction efficiency and DEF dosing immediately after a cold start and sets this code when the system's performance falls below the calibrated threshold.

DTC codes / P24xx · Auxiliary emission controls / P246F

P246FReductant System Cold Start Performance

P246F indicates that the reductant system, which injects diesel exhaust fluid (DEF) into the exhaust to reduce nitrogen oxides (NOx), did not achieve the expected performance during a cold start. The engine control module (ECM) monitors NOx reduction efficiency and DEF dosing immediately after a cold start and sets this code when the system's performance falls below the calibrated threshold.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaAuxiliary emission controls

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