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JLG error codes

JLG RT rough terrain scissor lifts (3394RT, 4394RT)

These machines do not give a fault number: the display and the JLG analyser show a text message (e.g. KEYSWITCH FAULTY - PLATFORM & GROUND ACTIVE TOGETHER), and some messages also flash out a flash code (e.g. 2/1) on the diagnostic light. In our database the message is also the code. Below are 124 messages with the original message from the manufacturer's manual and its description. They apply to these machines: JLG 3394RT, 4394RT. Source: JLG Service and Maintenance Manual 3394RT / 4394RT (3121249), Help Messages tables.

Showing the first 30: type more digits of the code.

The descriptions are quoted from the manufacturer's service documentation and are for guidance only. Clearing codes, calibrations and repairs are carried out by a qualified service technician according to the manual for the specific serial number. A machine with an active blocking code must not be used until the cause has been removed.

All JLG messages: the list

MessageMeaningType
FUNCTION SELECTED BUT TRIGGER SWITCH OPENFUNCTION SELECTED BUT TRIGGER SWITCH OPENwarning / function limited
RUNNING AT CUTBACK - ABOVE ELEVATIONRUNNING AT CUTBACK - ABOVE ELEVATIONmessage
ACCESSORY FAULTACCESSORY FAULTwarning / function limited
FRONT LEFT LEVELING JACK AT END OF STROKEFRONT LEFT LEVELING JACK AT END OF STROKEmessage
FRONT RIGHT LEVELING JACK AT END OF STROKEFRONT RIGHT LEVELING JACK AT END OF STROKEmessage
REAR LEFT LEVELING JACK AT END OF STROKEREAR LEFT LEVELING JACK AT END OF STROKEmessage
REAR RIGHT LEVELING JACK AT END OF STROKEREAR RIGHT LEVELING JACK AT END OF STROKEmessage
LEVELING JACK SET PREVENTED - ECM LOSTLEVELING JACK SET PREVENTED - ECM LOSTblocking fault
GENERATOR PREVENTED - ECM LOSTGENERATOR PREVENTED - ECM LOSTblocking fault
DRIVE PREVENTED - ECM LOSTDRIVE PREVENTED - ECM LOSTblocking fault
ELEVATION SENSOR DISAGREEMENTELEVATION SENSOR DISAGREEMENTblocking fault
KEYSWITCH FAULTY - PLATFORM & GROUND ACTIVE TOGETHERflash code 2/1KEYSWITCH FAULTY - PLATFORM & GROUND ACTIVE TOGETHERwarning / function limited
TRIGGER SWITCH WIRING SHORTED HIGH IN PLATFORM CABLEflash code 2/2TRIGGER SWITCH WIRING SHORTED HIGH IN PLATFORM CABLEblocking fault
TRIGGER SWITCH WIRING SHORTED LOW IN PLATFORM CABLEflash code 2/2TRIGGER SWITCH WIRING SHORTED LOW IN PLATFORM CABLEblocking fault
FUNCTION LOCKED OUT - DRIVE SELECT PERMANENTLY CLOSEDflash code 2/2FUNCTION LOCKED OUT - DRIVE SELECT PERMANENTLY CLOSEDblocking fault
FUNCTION LOCKED OUT - LIFT SELECT PERMANENTLY CLOSEDflash code 2/2FUNCTION LOCKED OUT - LIFT SELECT PERMANENTLY CLOSEDblocking fault
FUNCTION LOCKED OUT - FRONT DECK SELECT PERMANENTLY CLOSEDflash code 2/2FUNCTION LOCKED OUT - FRONT DECK SELECT PERMANENTLY CLOSEDblocking fault
FUNCTION LOCKED OUT - REAR DECK SELECT PERMANENTLY CLOSEDflash code 2/2FUNCTION LOCKED OUT - REAR DECK SELECT PERMANENTLY CLOSEDblocking fault
FUNCTION LOCKED OUT - START PERMANENTLY CLOSEDflash code 2/2FUNCTION LOCKED OUT - START PERMANENTLY CLOSEDblocking fault
FUNCTION LOCKED OUT - STEER LEFT PERMANENTLY CLOSEDflash code 2/2FUNCTION LOCKED OUT - STEER LEFT PERMANENTLY CLOSEDblocking fault
FUNCTION LOCKED OUT - STEER RIGHT PERMANENTLY CLOSEDflash code 2/2FUNCTION LOCKED OUT - STEER RIGHT PERMANENTLY CLOSEDblocking fault
FUNCTION LOCKED OUT - AUX POWER SWITCH PERMANENTLY CLOSEDflash code 2/2FUNCTION LOCKED OUT - AUX POWER SWITCH PERMANENTLY CLOSEDblocking fault
FUNCTION LOCKED OUT - GENERATOR SWITCH PERMANENTLY CLOSEDflash code 2/2FUNCTION LOCKED OUT - GENERATOR SWITCH PERMANENTLY CLOSEDblocking fault
FUNCTION LOCKED OUT - AUTOLEVEL SWITCH PERMANENTLY CLOSEDflash code 2/2FUNCTION LOCKED OUT - AUTOLEVEL SWITCH PERMANENTLY CLOSEDblocking fault
TRIGGER CLOSED TOO LONG WHILE IN NEUTRALflash code 2/2TRIGGER CLOSED TOO LONG WHILE IN NEUTRALwarning / function limited
FUNCTION LOCKED OUT - JOYSTICK NOT CENTEREDflash code 2/2FUNCTION LOCKED OUT - JOYSTICK NOT CENTEREDwarning / function limited
FUNCTION LOCKED OUT - TRIGGER SWITCH PERMANENTLY CLOSEDflash code 2/2FUNCTION LOCKED OUT - TRIGGER SWITCH PERMANENTLY CLOSEDblocking fault
JOYSTICK FAULTY - STEER SWITCHES ACTIVE TOGETHERflash code 2/2JOYSTICK FAULTY - STEER SWITCHES ACTIVE TOGETHERblocking fault
FUNCTION LOCKED OUT - HORN SWITCH PERMANENTLY CLOSEDflash code 2/2FUNCTION LOCKED OUT - HORN SWITCH PERMANENTLY CLOSEDblocking fault
JOYSTICK CALIBRATION FAULTYflash code 2/2JOYSTICK CALIBRATION FAULTYblocking fault
FUNCTION LOCKED OUT - GROUND LIFT UP PERMANENTLY CLOSEDflash code 2/3FUNCTION LOCKED OUT - GROUND LIFT UP PERMANENTLY CLOSEDblocking fault
FUNCTION LOCKED OUT - GROUND LIFT DOWN PERMANENTLY CLOSEDflash code 2/3FUNCTION LOCKED OUT - GROUND LIFT DOWN PERMANENTLY CLOSEDblocking fault
FUNCTION LOCKED OUT - GROUND FRONT DECK EXT PERMANENTLY CLOSEDflash code 2/3FUNCTION LOCKED OUT - GROUND FRONT DECK EXT PERMANENTLY CLOSEDblocking fault
FUNCTION LOCKED OUT - GROUND FRONT DECK RET PREMANENTLY CLOSEDflash code 2/3FUNCTION LOCKED OUT - GROUND FRONT DECK RET PREMANENTLY CLOSEDblocking fault
FUNCTION LOCKED OUT - GROUND REAR DECK EXT PERMANENTLY CLOSEDflash code 2/3FUNCTION LOCKED OUT - GROUND REAR DECK EXT PERMANENTLY CLOSEDblocking fault
FUNCTION LOCKED OUT - GROUND REAR DECK RET PERMANENTLY CLOSEDflash code 2/3FUNCTION LOCKED OUT - GROUND REAR DECK RET PERMANENTLY CLOSEDblocking fault
GROUND LIFT UP/DOWN ACTIVE TOGETHERflash code 2/3GROUND LIFT UP/DOWN ACTIVE TOGETHERwarning / function limited
GROUND FRONT DECK EXTEND/RETRACT ACTIVE TOGETHERflash code 2/3GROUND FRONT DECK EXTEND/RETRACT ACTIVE TOGETHERwarning / function limited
GROUND REAR DECK EXTEND/RETRACT ACTIVE TOGETHERflash code 2/3GROUND REAR DECK EXTEND/RETRACT ACTIVE TOGETHERwarning / function limited
NO SIGNAL FROM TILT SENSOR X AXIS - CHECK WIRINGflash code 2/3NO SIGNAL FROM TILT SENSOR X AXIS - CHECK WIRINGblocking fault
NO SIGNAL FROM TILT SENSOR Y AXIS - CHECK WIRINGflash code 2/3NO SIGNAL FROM TILT SENSOR Y AXIS - CHECK WIRINGblocking fault
LEVEL SENSOR FAILUREflash code 2/3LEVEL SENSOR FAILUREblocking fault
FUNCTION LOCKED OUT - GROUND AUX SWITCH PERMANENTLY CLOSEDflash code 2/3FUNCTION LOCKED OUT - GROUND AUX SWITCH PERMANENTLY CLOSEDblocking fault
FUNCTION LOCKED OUT - GROUND START SWITCH PERMANENTLY CLOSEDflash code 2/3FUNCTION LOCKED OUT - GROUND START SWITCH PERMANENTLY CLOSEDblocking fault
ELEV ANGLE SENSOR FAULTY - NOT MOUNTED OR VOLTAGE OUT OF RANGEflash code 2/5ELEV ANGLE SENSOR FAULTY - NOT MOUNTED OR VOLTAGE OUT OF RANGEblocking fault
ELEV ANGLE SENSOR HAS NOT BEEN CALIBRATEDflash code 2/5ELEV ANGLE SENSOR HAS NOT BEEN CALIBRATEDblocking fault
ELEVATION PROX SWITCH PERMANENTLY CLOSEDflash code 2/5ELEVATION PROX SWITCH PERMANENTLY CLOSEDblocking fault
ELEVATION PROX SWITCH PERMANENTLY OPENflash code 2/5ELEVATION PROX SWITCH PERMANENTLY OPENblocking fault
FRONT LEFT LEVELING JACK PRESSURE TRANSDUCER FAILUREflash code 2/5FRONT LEFT LEVELING JACK PRESSURE TRANSDUCER FAILUREblocking fault
FRONT RIGHT LEVELING JACK PRESSURE TRANSDUCER FAILUREflash code 2/5FRONT RIGHT LEVELING JACK PRESSURE TRANSDUCER FAILUREblocking fault
REAR LEFT LEVELING JACK PRESSURE TRANSDUCER FAILUREflash code 2/5REAR LEFT LEVELING JACK PRESSURE TRANSDUCER FAILUREblocking fault
REAR RIGHT LEVELING JACK PRESSURE TRANSDUCER FAILUREflash code 2/5REAR RIGHT LEVELING JACK PRESSURE TRANSDUCER FAILUREblocking fault
PLATFORM OVERLOADflash code 2/5PLATFORM OVERLOADblocking fault
FRONT LEFT LEVELING JACK STOW SWITCH PERMANENTLY CLOSEDflash code 2/5FRONT LEFT LEVELING JACK STOW SWITCH PERMANENTLY CLOSEDblocking fault
FRONT RIGHT LEVELING JACK STOW SWITCH PERMANENTLY CLOSEDflash code 2/5FRONT RIGHT LEVELING JACK STOW SWITCH PERMANENTLY CLOSEDblocking fault
REAR LEFT LEVELING JACK STOW SWITCH PERMANENTLY CLOSEDflash code 2/5REAR LEFT LEVELING JACK STOW SWITCH PERMANENTLY CLOSEDblocking fault
REAR RIGHT LEVELING JACK STOW SWITCH PERMANENTLY CLOSEDflash code 2/5REAR RIGHT LEVELING JACK STOW SWITCH PERMANENTLY CLOSEDblocking fault
ELEV ANGLE SENSOR NOT DETECTING CHANGEflash code 2/5ELEV ANGLE SENSOR NOT DETECTING CHANGEblocking fault
FRONT LEFT LEVELING JACK OPEN CIRCUITflash code 2/6FRONT LEFT LEVELING JACK OPEN CIRCUITblocking fault
FRONT LEFT LEVELING JACK SHORT TO GROUNDflash code 2/6FRONT LEFT LEVELING JACK SHORT TO GROUNDblocking fault
FRONT LEFT LEVELING JACK SHORT TO BATTERYflash code 2/6FRONT LEFT LEVELING JACK SHORT TO BATTERYblocking fault
FRONT RIGHT LEVELING JACK OPEN CIRCUITflash code 2/6FRONT RIGHT LEVELING JACK OPEN CIRCUITblocking fault
FRONT RIGHT LEVELING JACK SHORT TO GROUNDflash code 2/6FRONT RIGHT LEVELING JACK SHORT TO GROUNDblocking fault
FRONT RIGHT LEVELING JACK SHORT TO BATTERYflash code 2/6FRONT RIGHT LEVELING JACK SHORT TO BATTERYblocking fault
REAR LEFT LEVELING JACK OPEN CIRCUITflash code 2/6REAR LEFT LEVELING JACK OPEN CIRCUITblocking fault
REAR LEFT LEVELING JACK SHORT TO GROUNDflash code 2/6REAR LEFT LEVELING JACK SHORT TO GROUNDblocking fault
REAR LEFT LEVELING JACK SHORT TO BATTERYflash code 2/6REAR LEFT LEVELING JACK SHORT TO BATTERYblocking fault
REAR RIGHT LEVELING JACK OPEN CIRCUITflash code 2/6REAR RIGHT LEVELING JACK OPEN CIRCUITblocking fault
REAR RIGHT LEVELING JACK SHORT TO GROUNDflash code 2/6REAR RIGHT LEVELING JACK SHORT TO GROUNDblocking fault
REAR RIGHT LEVELING JACK SHORT TO BATTERYflash code 2/6REAR RIGHT LEVELING JACK SHORT TO BATTERYblocking fault
LEVELING JACK EXTEND VALVE OPEN CIRCUITflash code 2/6LEVELING JACK EXTEND VALVE OPEN CIRCUITblocking fault
LEVELING JACK EXTEND VALVE SHORT TO GROUNDflash code 2/6LEVELING JACK EXTEND VALVE SHORT TO GROUNDblocking fault
LEVELING JACK EXTEND VALVE SHORT TO BATTERYflash code 2/6LEVELING JACK EXTEND VALVE SHORT TO BATTERYblocking fault
LEVELING JACK RETRACT VALVE OPEN CIRCUITflash code 2/6LEVELING JACK RETRACT VALVE OPEN CIRCUITblocking fault
LEVELING JACK RETRACT VALVE SHORT TO GROUNDflash code 2/6LEVELING JACK RETRACT VALVE SHORT TO GROUNDblocking fault
LEVELING JACK RETRACT VALVE SHORT TO BATTERYflash code 2/6LEVELING JACK RETRACT VALVE SHORT TO BATTERYblocking fault
FRONT DECK EXTEND VALVE OPEN CIRCUITflash code 2/6FRONT DECK EXTEND VALVE OPEN CIRCUITblocking fault
FRONT DECK EXTEND VALVE SHORT TO GROUNDflash code 2/6FRONT DECK EXTEND VALVE SHORT TO GROUNDblocking fault
FRONT DECK EXTEND VALVE SHORT TO BATTERYflash code 2/6FRONT DECK EXTEND VALVE SHORT TO BATTERYblocking fault
FRONT DECK RETRACT VALVE OPEN CIRCUITflash code 2/6FRONT DECK RETRACT VALVE OPEN CIRCUITblocking fault
FRONT DECK RETRACT VALVE SHORT TO GROUNDflash code 2/6FRONT DECK RETRACT VALVE SHORT TO GROUNDblocking fault
FRONT DECK RETRACT VALVE SHORT TO BATTERYflash code 2/6FRONT DECK RETRACT VALVE SHORT TO BATTERYblocking fault
REAR DECK EXTEND VALVE OPEN CIRCUITflash code 2/6REAR DECK EXTEND VALVE OPEN CIRCUITblocking fault
REAR DECK EXTEND VALVE SHORT TO GROUNDflash code 2/6REAR DECK EXTEND VALVE SHORT TO GROUNDblocking fault
REAR DECK EXTEND VALVE SHORT TO BATTERYflash code 2/6REAR DECK EXTEND VALVE SHORT TO BATTERYblocking fault
REAR DECK RETRACT VALVE OPEN CIRCUITflash code 2/6REAR DECK RETRACT VALVE OPEN CIRCUITblocking fault
REAR DECK RETRACT VALVE SHORT TO GROUNDflash code 2/6REAR DECK RETRACT VALVE SHORT TO GROUNDblocking fault
REAR DECK RETRACT VALVE SHORT TO BATTERYflash code 2/6REAR DECK RETRACT VALVE SHORT TO BATTERYblocking fault
FUEL SENSOR SHORT TO BATTERYflash code 4/3FUEL SENSOR SHORT TO BATTERYblocking fault
FUEL SENSOR SHORT TO GROUNDflash code 4/3FUEL SENSOR SHORT TO GROUNDblocking fault
FUEL SENSOR DISCONNECTEDflash code 4/3FUEL SENSOR DISCONNECTEDblocking fault
OIL PRESSURE SHORT TO BATTERYflash code 4/3OIL PRESSURE SHORT TO BATTERYblocking fault
OIL PRESSURE SHORT TO GROUNDflash code 4/3OIL PRESSURE SHORT TO GROUNDblocking fault
COOLANT TEMPERATURE SHORT TO GROUNDflash code 4/3COOLANT TEMPERATURE SHORT TO GROUNDblocking fault
ENGINE TEMPERATURE HIGHflash code 4/3ENGINE TEMPERATURE HIGHmessage
AIR FILTER BYPASSEDflash code 4/3AIR FILTER BYPASSEDmessage
NO ALTERNATOR OUTPUTflash code 4/3NO ALTERNATOR OUTPUTblocking fault
OIL PRESSURE LOWflash code 4/3OIL PRESSURE LOWblocking fault
ENGINE SHUTDOWN COMMANDED - CHECK ENGINE SENSORSflash code 4/3ENGINE SHUTDOWN COMMANDED - CHECK ENGINE SENSORSblocking fault
WRONG ENGINE SELECTEDflash code 4/3WRONG ENGINE SELECTEDblocking fault
DEUTZ ECM FAULT CODEflash code 4/3DEUTZ ECM FAULT CODEblocking fault
BATTERY LOWflash code 4/4BATTERY LOWwarning / function limited
BATTERY TOO HIGH - SYSTEM SHUTDOWNflash code 4/4BATTERY TOO HIGH - SYSTEM SHUTDOWNblocking fault
BATTERY TOO LOW - SYSTEM SHUTDOWNflash code 4/4BATTERY TOO LOW - SYSTEM SHUTDOWNblocking fault
LSS BATTERY VOLTAGE HIGHflash code 4/4LSS BATTERY VOLTAGE HIGHwarning / function limited
LSS BATTERY VOLTAGE LOWflash code 4/4LSS BATTERY VOLTAGE LOWwarning / function limited
SPEED SENSOR READING INVALID SPEEDflash code 5/5SPEED SENSOR READING INVALID SPEEDblocking fault
SPEED INPUT LOSTflash code 5/5SPEED INPUT LOSTblocking fault
CAN BUS FAILUREflash code 6/6CAN BUS FAILUREblocking fault
LSS NOT SENDING CAN MESSAGESflash code 6/6LSS NOT SENDING CAN MESSAGESblocking fault
ENGINE CONTROLLER CAN COMMUNICATION LOSTflash code 6/6ENGINE CONTROLLER CAN COMMUNICATION LOSTblocking fault
TWO PLATFORM MODULES DETECTEDflash code 6/6TWO PLATFORM MODULES DETECTEDblocking fault
LSS CELL #1 ERRORflash code 8/1LSS CELL #1 ERRORblocking fault
LSS CELL #2 ERRORflash code 8/2LSS CELL #2 ERRORblocking fault
LSS CELL #3 ERRORflash code 8/3LSS CELL #3 ERRORblocking fault
LSS CELL #4 ERRORflash code 8/4LSS CELL #4 ERRORblocking fault
LSS WATCHDOG RESETflash code 9/1LSS WATCHDOG RESETblocking fault
LSS EEPROM ERRORflash code 9/2LSS EEPROM ERRORblocking fault
LSS HAS NOT BEEN CALIBRATEDflash code 9/3LSS HAS NOT BEEN CALIBRATEDblocking fault
LSS NEEDS TO BE RE-CALIBRATEDflash code 9/9LSS NEEDS TO BE RE-CALIBRATEDblocking fault
LSS INTERNAL ERROR - PIN EXCITATIONflash code 9/9LSS INTERNAL ERROR - PIN EXCITATIONblocking fault
LSS INTERNAL ERROR - DRIVER FAULTflash code 9/9LSS INTERNAL ERROR - DRIVER FAULTblocking fault
LSS INTERNAL ERROR - DRDY MISSING FROM A/Dflash code 9/9LSS INTERNAL ERROR - DRDY MISSING FROM A/Dblocking fault
EEPROM FAILURE - CHECK ALL SETTINGSflash code 9/9EEPROM FAILURE - CHECK ALL SETTINGSblocking fault