NOTE: This code sets when the aftertreatment control module (ACM) detects that the diesel exhaust fluid (DEF) pump speed is too low when activated.
DESCRIPTION:Non DEF flow situation.
MONITORED PARAMETER:DEF pump speed.
TYPICAL ENABLING CONDITIONS:DEF pump enabled and cannot operate above a DEF pump speed threshold.
MONITOR SEQUENCE:DEF pump is enabled.
EXECUTION FREQUENCY:Service tool and infrequent in-use checks during on DEF dosing conditions.
TYPICAL DURATION:Two seconds
DASH LAMPS:1. MIL2. CEL
ENGINE REACTION:Derate 25%
VERIFICATION:Selective catalyst reduction airless dosing system (SCR ADS) self-check.
NOTE: If codes 4374-3, 4374-4, or 4374-5 are active, fix those first.
PROBABLE CAUSES:1. Inspect the DEF pump harness wiring & connector.2. Failed DEF pump.