PACCAR MX (2004 Emissions) Fault Code: P151D Aftertreatment System – DEF Level Very Low

SET CONDITIONS:
The DEF level is less than 15% of the DEF tank volume.

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the ignition is on.

RESET CONDITION:
This DTC becomes inactive after the ignition is keyed on and the volume in the DEF tank is above the set condition value.

POSSIBLE CAUSES:
Empty DEF tank

ADDITIONAL INFORMATION:
This DTC activates an engine torque derate of 25% and P1518 becomes active.