Grease,

Code 54 is for pump controller not responding to master controller. See listing below for code.

54 Pump controller does not respond to
master controller.
No Pump
Symptom
Hydraulic pump motor does not operate.
Possible Causes and Test Procedures
* Malfunction of motor controller.
Check key switch input to motor controller.
See Controller Status Light Emitting Diodes (LEDs).
* CANbus communication between motor controller and master controller is not working
Check for loose or broken wires.
* This status code may appear on trucks with contactor controlled DC pump motors. The master controller senses
the presence of a contactor by a voltage on pin 40. If there is no voltage on pin 40, the master controller assumes
an AC pump motor controller is present, but not able to communicate.
Check for voltage at the pump contactor coil.
Check wiring from pump contactor coil to master controller, pin 40.
* A code may appear when the master controller does not detect the key turning OFF, but the pump controller does
detect the key turning OFF. This is caused when there is a voltage on the key switch circuit that is greater that 3
volts and less than 10 volts with the key turned OFF.
The CANBUS wires are solid yellow and green wires twisted together. Good Luck