What does code P20E8 mean?

Q: What does code P20E8 mean?

Reductant Pressure Too Low. P20E8 indicates that the powertrain control module has detected reductant pressure below the expected threshold in the selective catalytic reduction system, which injects diesel exhaust fluid into the exhaust stream. The computer monitors a pressure sensor in the reductant supply circuit and sets this code when the measured pressure stays too low during commanded operation.

DTC codes / P20xx · Fuel and air metering and auxiliary emission controls / P20E8

P20E8Reductant Pressure Too Low

P20E8 indicates that the powertrain control module has detected reductant pressure below the expected threshold in the selective catalytic reduction system, which injects diesel exhaust fluid into the exhaust stream. The computer monitors a pressure sensor in the reductant supply circuit and sets this code when the measured pressure stays too low during commanded operation.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering and auxiliary 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.