DEF dosing valve circuit open
The ECM is commanding a device on but almost no current flows. The circuit is open somewhere: connector, wire or the coil in the device.
SPN 5394 — DEF dosing valve circuit open
SPN 5394 is the parameter the ECM is flagging on CAT, Detroit, International, PACCAR, MERCEDES, Volvo, Mack, Cummins engines. The FMI that comes with it tells you how it failed. Each failure mode below has its own causes and its own test order — do not treat them as the same repair.
DEF dosing valve circuit open
The ECM is commanding a device on but almost no current flows. The circuit is open somewhere: connector, wire or the coil in the device.
DEF dosing valve circuit open
The ECM is commanding a device on but almost no current flows. The circuit is open somewhere: connector, wire or the coil in the device.
DEF dosing valve circuit open
The ECM is commanding a device on but almost no current flows. The circuit is open somewhere: connector, wire or the coil in the device.
DEF dosing valve circuit open
The ECM is commanding a device on but almost no current flows. The circuit is open somewhere: connector, wire or the coil in the device.
DEF dosing valve circuit open
The ECM is commanding a device on but almost no current flows. The circuit is open somewhere: connector, wire or the coil in the device.
DEF dosing valve circuit open
The ECM is commanding a device on but almost no current flows. The circuit is open somewhere: connector, wire or the coil in the device.
DEF dosing valve circuit open
The ECM is commanding a device on but almost no current flows. The circuit is open somewhere: connector, wire or the coil in the device.
The reference is free. The diagnosis is Pro.
Every SPN and FMI page on this site stays open — no account needed. Pro members can take the code into Truck Commander Pro AI with the VIN, symptoms and photos, keep per-truck history, and print a work order. $14.99 a month or $99.99 a year.