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Fix those codes!
So your JLG boom lift isn’t functioning properly? Well that’s alright because we’ve come up with a troubleshooting page for you, this one specifically for JLG boom lifts. Written below are some highly popular JLG boom lifts and their corresponding error codes, although not restricted to these models. If you ever need or accessories, you can visit our website by
Popular JLG Boom Lifts:
– JLG 400S – JLG 800’s
– JLG 450A’s – JLG 860SJ
– JLG 460SJ – JLG E300’s
– JLG 600’s – JLG E400’s
– JLG 660SJ’s – JLG E450’s
Chassis & Turntable Codes
Listed below are various Diagnostic Trouble Codes and their corresponding descriptions along with the best action to take to resolve it.
DTC: 116
Fault Message: ECT higher than expected stage 1
Description: Engine Coolant Temperature reading or estimate greater than the stage 1 limit when operating at a speed greater than defined in the diagnostic calibration.
Corrective Action: Sound audible warning or illuminate secondary warning lamp, disable adaptive learning fuel correction during active fault.
DTC: 117
Fault Message: ECT Voltage Low
Description: Sensor voltage less than the limit defined in the diagnostic calibration.
Corrective Action: Sound audible warning or illuminate secondary warning lamp, disable adaptive learning fuel correction during active fault.
DTC: 118
Fault Message: ECT Voltage High
Description: Sensor voltage higher than the limit defined in the diagnostic calibration.
Corrective Action: Sound audible warning or illuminate secondary warning lamp, disable adaptive learning fuel correction during active fault.
DTC: 122
Fault Message: TPS 1 Low Voltage
Description: TPS sensor voltage lower than the limit defined in the diagnostic calibration.
Corrective Action: Sound audible warning or illuminate secondary warning lamp, shut down engine
DTC: 123
Fault Message: TPS 1 High Voltage
Description: TPS sensor voltage higher than the limit defined in the diagnostic calibration.
Corrective Action: Sound audible warning or illuminate secondary warning lamp, shut down engine
DTC: 217
Fault Message: ECT higher than expected stage 2
Description: Engine coolant temperature reading greater than the stage 2 limit when operating at a speed greater than defined.
Corrective Action: Sound audible warning or illuminate secondary warning lamp, disable adaptive learning fuel correction during active fault.
DTC: 219
Fault Message: RPM higher than max allowed
Description: Engine speed greater than the max governor override speed as defined.
Corrective Action: Sound audible warning or illuminate secondary warning lamp, reduce throttle to limit speed.
DTC: 336
Fault Message: Crank signal input noise
Description: Electrical noise or irregular crank pattern detected causing x number of crank resynchronization events
Corrective Action: Illuminate MIL and/or sound audible warning or illuminate secondary warning lamp and disable fueling correction for remainder of key cycle.
DTC: 337
Fault Message: Loss of Crank Input Signal
Description: loss of crankshaft position signal while valid camshaft position signals continue for x number of cam pulses.
Corrective Action: Illuminate MIL and/or sound audible warning or illuminate secondary warning lamp.
DTC: 521
Fault Message: Oil pressure high
Description: Oil pressure is indicating high when the engine has been stopped for more than x seconds.
Corrective Action: Illuminate MIL and/or sound audible warning or illuminate secondary warning lamp, possibly configure for power derate 1 or low rev limit.
DTC: 524
Fault Message: Oil pressure low
Description: Engine oil pressure lower than expected while engine has been running for a minimum amount of time
Corrective Action: Illuminate MIL and/or sound audible warning or illuminate secondary warning lamp, generally configured to derate the engine and trigger an engine shutdown.
DTC: 562
Fault Message: Battery voltage low
Description: Battery voltage to ECM less than x volts while the engine is operating at y RPM or greater
Corrective Action: Illuminate MIL and/or sound audible warning or illuminate secondary warning lamp, disable adaptive fueling correction for remainder of key cycle.
DTC: 563
Fault Message: Battery voltage high
Description: Battery voltage to ECM greater than x volts while the engine is running.
Corrective Action: Illuminate MIL and/or sound audible warning or illuminate secondary warning lamp, disable adaptive fueling correction for remainder of key cycle.
DTC: 642
Fault Message: Sensor supply voltage 1 low
Description: ECM 5 volt output is below the acceptable limit.
Corrective Action: Illuminate MIL and/or sound audible warning or illuminate secondary warning lamp.
DTC: 643
Fault Message: Sensor supply voltage 1 high
Description: ECM 5 volt output is above the acceptable limit.
Corrective Action: Illuminate MIL and/or sound audible warning or illuminate secondary warning lamp.
DTC: 1612
Fault Message: Microprocessor failure RTI 1
Description: Internal microprocessor error
DTC: 1613
Fault Message: Microprocessor failure RTI 2
Description: Internal microprocessor error
DTC: 1614
Fault Message: Microprocessor failure RTI 3
Description: Internal microprocessor error
DTC: 1615
Fault Message: Microprocessor failure A/D
Description: Internal microprocessor error
DTC: 1616
Fault Message: Microprocessor failure Interrupt
Description: Internal microprocessor error
DTC: 1625
Fault Message: CAN J1939 shutdown request
Description: ECM has received shutdown message from another CAN device and is shutdown on request.
Corrective Action: Illuminate MIL and/or sound audible warning or illuminate secondary warning lamp.
DTC: 1652
Fault Message: TPS1 loss of communications
Description: ECM is expecting to receive throttle position information from the throttle actuator and is not.
Corrective Action: Illuminate MIL and/or sound audible warning or illuminate secondary warning lamp. Shut down engine.
DTC: 2111
Fault Message: Unable to reach lower TPS
Description: Throttle command is 20% less than throttle position for 200ms or longer.
Corrective Action: Engine shut down
DTC: 2112
Fault Message: Unable to reach higher TPS
Description: Throttle command is 20% more than actual throttle position.
Corrective Action: Engine shut down
DTC: 9999
Fault Message: TPS1 failsafe spring failure
Description: When the key is off, the ECM is expecting the failsafe spring in the actuator to return the throttle position to near 0%.
Corrective Action: Illuminate MIL and/or sound audible warning or illuminate secondary warning lamp. Govern the engine speed to a forced idle speed.
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