26 JCB diagnostic codes on file — with the full diagnosis, repair steps, and field insights open to read free, no signup required.
Disclaimer: General reference information for trained, qualified technicians only. Codes and procedures vary by model, serial number and software version. Always follow the manufacturer's service manual and your site's safety procedures. Use at your own risk. Not affiliated with or endorsed by any manufacturer.
Find a JCB code by searching below, or browse the table. Codes on file by system:
| Code | System | Symptom | Full fix |
|---|---|---|---|
| 101 | Transmission | No Drive / Neutral Only. | View fix |
| B1104-14 | Controls / Joysticks | Boom Lifts Uncommanded or Won't Lower | View fix |
| B1123-13 | Boom / Telescope | Boom Will Not Extend / Retract Works | View fix |
| B1201-11 | Safety / Seat | Hydraulics Drop Out When Operator Leans | View fix |
| C1085-01 | Safety / Interlock | Boom Up/Down Dead / Green Light Flashes | View fix |
| C108A-12 | Safety / LLMI | Hydraulics Locked / Alarm Buzzer Sounds | View fix |
| E0301 | Electrical | No-Start / Intermittent Shutdown | View fix |
| E0301 | Electrical | No-Start / intermittent Shutdown | View fix |
| E0301 | Electrical | No-Start / Intermittent Shutdown | View fix |
| P0101 | Air Intake (MAF) | Engine Stumble / High Fuel Use. | View fix |
| P0122 | Throttle / Engine | Engine Defaults to Low Idle / Throttle Dial Dead | View fix |
| P0193 | Fuel (Rail) | Engine Derate / Harsh Knock. | View fix |
| P0404 | — | Limp Mode. | View fix |
| P0404 | Emissions (EGR) | Low Power / Black Smoke. | View fix |
| P0524 | Engine (Lube) | Engine Shutdown / Low Oil Press. | View fix |
| P0562 | Electrical / System | Gauges Sweep Erratic / Transmission Drops Out | View fix |
| P0721 | Transmission / Speed | Harsh Shifts / Transmission Drops Drive | View fix |
| P204F | AdBlue / DEF | Limp Mode / SCR System Fault | View fix |
| P204F | DEF/SCR | AdBlue System Bank 1 Performance | View fix |
| P204F | Emissions / DEF | Limp Mode / SCR System Fault | View fix |
| P204F | AdBlue / DEF | Limp Mode / SCR System Fault | View fix |
| P205B-00 | — | No SCR Dosing. | View fix |
| P2269 | Fuel (Water) | Water in Fuel Alarm / Limp Mode. | View fix |
| P2269 | Fuel | Water in Fuel Light. | View fix |
| SPN 522700 FMI 04 | Hydraulics / Slew | Sway / Frame Leveling Cylinders Won't Stroke | View fix |
| U0100 | Electrical (CAN) | No Crank / Dash "Lost Comm". | View fix |
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