Diagnostics
JLG Telescopic Boom Lift Fault Codes List & Code Lookup
Look up 27 JLG Telescopic Boom Lift fault codes and error codes, in plain English. 27 of them have a full guide covering what the code means, what triggers it, the most common causes, and the first things to check before you call the dealer.
- 1Speed Sensor 1
- 10Charge Air Temperature
- 11Sleep Mode
- 12Throttle Position (TP) Sensor Low Voltage
- 13Overspeed
- 14Manifold Absolute Pressure (MAP) Low Voltage
- 17Help Comment - Over Moment - Hydraulics Suspended
- 21Problems with Foot Switch
- 22Problems with Drive & Steer Selection
- 23Problems with Boom Function Selection
- 31Contactor Did Not Close When Energized
- 32Charge Air Temperature Warning
- 33Driver Problem
- 34Coolant Level Warning
- 35Brake Pressure Problem
- 43Problems with the Engine
- 44Problems with the Battery Supply
- 45Intake Air Temperature (lAT) Sensor Low Voltage
- 55Vehicle Engine RPM or the Encoder
- 66Problems with the CAN Bus
- 77Problems with a Motor
- 83Reference Voltage 1
- 84Reference Voltage 2
- 85Reference Voltage 4
- 86Internal Temperature
- 861Steering Axle - Restricted to Transport - Oscillating Axle Pressure Switch Disagreement
- 99Problems with the Controller
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Safety-critical: confirm before use
Safety first: park on level ground, stop the engine, and secure the machine before any inspection. Thresholds, component locations, wire numbers, fuse locations, and reset procedures can vary by model, configuration, and serial number. Confirm them in the service documentation for your exact machine.