EES Loss of Communication to Controller

The emissions after-treatment system (EES) lost CAN/serial communication with the main controller.

Possible causes

Damaged or disconnected CAN harness between EES and controller
EES ECU not powered (blown fuse)
Failed EES ECU
Termination resistor or CAN bus fault

Recommended actions

Inspect EES harness and connectors
Verify EES ECU power and ground
Check CAN bus voltages and termination
Reset; if alarm reactivates, replace EES ECU

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