Troubleshooting guide
JCB 3CX & 3DX error codes
JCB 3CX and 3DX error codes (E-codes) are fault codes stored by the engine ECU when it detects a problem with a sensor, circuit or component. Below are 144 codes for the JCB 3CX & 3DX backhoe loader and what each one means. Use the filter to find a code (e.g. E051) or a keyword (e.g. fuel, sensor).
Reference only — not a repair guide. These descriptions explain what each fault code means. Diagnosis and repair of JCB 3CX & 3DX faults should be carried out by a qualified technician using JCB diagnostic tools. Heavy Duty Parts supplies parts and is not an official JCB dealer.
Fuel & injection 48
E004Fuel timing pressure sensor (ECU) circuit fault - voltage below normal or shorted low
E051High pressure fuel solenoid valve number 1 fault - voltage below normal or shorted low
E052High pressure fuel solenoid valve number 1 fault - voltage above normal or shorted high
E055High pressure fuel solenoid valve number 1 fault - valve not responding correctly
E076Injector solenoid valve fault, cylinder 1 - current above normal or grounded circuit
E078Injector solenoid valve fault, cylinder 3 - current above normal or grounded circuit
E080Injector solenoid valve fault, cylinder 2 - current above normal or grounded circuit
E082Injector solenoid valve fault, cylinder 4 - current above normal or grounded circuit
E083Injector solenoid valve fault, cylinder 1 - current below normal or open circuit
E085Injector solenoid valve fault, cylinder 3 - current below normal or open circuit
E089Injector solenoid valve fault, cylinder 2 - current below normal or open circuit
E090Injector solenoid valve fault, cylinder 4 - current below normal or open circuit
E096Fuel pump control module fault - voltage above normal or shorted high
E097Fuel pump control module fault - voltage below normal or shorted low
E098Fuel pump control module, CAN fault - pump not responding correctly
E104Fuel pump control module idle fault - data erratic
E133High pressure fuel pump mechanical system not responding
E134Injector metering rail pressure sensor fault - voltage above normal or shorted high
E135Injector metering rail pressure sensor fault - voltage below normal or shorted low
E138Fuel pump calibration trim circuit fault - calibration fault
E142Fuel metering solenoid fault
E183Injector Metering Rail # 1 Pressure — Data erratic, intermittent or inconect
E700High pressure fuel pump delivery pressure low - data below normal level
E701High pressure fuel solenoid valve number 1 fault - data erratic
E702High pressure fuel pump mechanical system not responding
E703High pressure fuel pump delivery pressure low - data above normal level
E705Minimum injector drive pulse drift - cylinder 2 - injector not responding correctly
E706Minimum injector drive pulse drift - cylinder 1 - injector not responding correctly
E707Minimum injector drive pulse drift - cylinder 3 - injector not responding correctly
E717Injector Metering Rail # 1 Pressure — Condition exists
E729Engine injector bank 1 (cylinders 2 and 4) - ECU fault
E730Engine injector bank 2 (cylinders 1 and 3) - ECU fault
E731High Fuel Pressure Solenoid Valve Number 1 Fault
E732High Fuel Pressure Solenoid Valve Number 1 Fault
E736Engine Injector Bank 1 — Voltage below normal, or shorted to low source
E745Minimum injector drive pulse drift - cylinder 4 - injector not responding correctly
E747Engine Gaseous Fuel Correction Factor — Out of calibration
E748Engine Gaseous Fuel Correction Factor — Data erratic, intermittent or incorrect
E753Engine Electric Lift Pump for Engine Fuel Supply — Voltage above normal or shorted to high source
E760Engine Electric Lift Pump for Engine Fuel Supply — Voltage below normal or shorted to low source
E761Engine Electric Lift Pump for Engine Fuel Supply — Cunent below normal or open circuit
E762Engine Electric Lift Pump for Engine Fuel Supply — Cunent above normal or grounded circuit
E774Injector Metering Rail # 1 Pressure — Out of calibration
E776Engine Fuel Injection Pump Fuel Control Valve (IMV) — Cunent below normal or open circuit
E777Engine Fuel Injection Pump Fuel Control Valve (IMV) — Cunent above normal or grounded circuit
E778Engine Fuel Injection Pump Fuel Control Valve (IMV)
E779Engine Fuel Injection Pump Fuel Control Valve (IMV)
E780Engine Fuel Injection Pump Fuel Control Valve (IMV) — Condition exists
Air / boost / TMAP 13
E008Inlet manifold air pressure sensor (TMAP) fault - voltage above normal or shorted high
E009Inlet manifold air pressure sensor (TMAP) fault - voltage below normal or shorted low
E111Inlet manifold heater - relay enable fault
E126Inlet manifold air pressure sensor (TMAP) fault - data erratic
E710Intake Air Heater (Relay Enable) # 1 — Voltage above normal or shorted to high source
E711Intake Air Heater (Relay Enable) # 1 — Voltage below normal or shorted to low source
E712Intake Air Heater (Relay Enable) # 1 — Current below normal or open circuit
E713Intake Air Heater (Relay Enable) # 1 — Cunent above normal or grounded circuit
E715Boost pressure validity - no fault, air pressure sensor data is plausible
E786Intake Air Heater (Relay Enable) # 2 — Voltage below normal or shorted to low source
E787Intake Air Heater (Relay Enable) # 2 — Cunent below normal or open circuit
E788Intake Air Heater (Relay Enable) # 2 — Cunent above normal or grounded circuit
E794Intake Air Heater (Relay Enable) # 2 — Voltage above normal or shorted to high source
Throttle & pedal 6
E010Throttle pedal position sensor fault - voltage above normal or shorted high
E011Throttle pedal position sensor fault - voltage below normal or shorted low
E012Hand throttle position sensor fault - voltage above normal or shorted high
E013Hand throttle position sensor fault - voltage below normal or shorted low
E716Throttle pedal position sensor fault - data erratic
E738Hand throttle position sensor fault - data erratic
Temperature sensors 17
E017Engine coolant temperature sensor fault - voltage above normal or shorted high
E018Engine coolant temperature sensor fault - voltage below normal or shorted low
E023Inlet manifold air temperature sensor (TMAP) fault - voltage above normal or shorted high
E024Inlet manifold air temperature sensor (TMAP) fault - voltage below normal or shorted low
E047Fuel temperature sensor fault - voltage above normal or shorted high
E048Fuel Temperature — Root cause not known
E049Fuel temperature sensor fault - voltage below normal or shorted low
E068Engine control module (ECU) internal temperature sensor fault - voltage above normal or shorted high
E069Engine control module (ECU) internal temperature sensor fault - voltage below normal or shorted low
E172Engine Coolant Temperature — Data erratic, intermittent or inconect
E709Engine coolant temperature validity - no fault, temperature sensor data is plausible
E722Auxiliary Output #1 (Temperature Gauge I Lamp) — Voltage below normal or shorted to low source
E723Auxiliary Output #1 (Temperature Gauge / Lamp) — Cunent below normal or open circuit
E724Auxiliary Output #1 (Temperature Gauge / Lamp) — Cunent above normal or grounded circuit
E763Intake Manifold Temperature Sensor Fault — Condition exists
E784Intake Manifold Temperature Sensor Fault — Abnormal rate of change
E792Auxiliary Output #1 (Temperature Gauge / Lamp) — Voltage above normal or shorted to high source
Sensor supply & power 11
E027Sensor supply voltage circuit fault - voltage below normal or shorted low
E036Sensor Supply Voltage 3 (+5V) — Data erratic, intermittent or incorrect
E095Sensor supply voltage 1 (+5V) fault - voltage below normal or shorted low
E113Sensor Supply Voltage 2 — Voltage above normal or shorted to high source
E114Sensor supply voltage 1 (+5V) fault - voltage above normal or shorted high
E127Power supply fault - data erratic
E129Battery voltage fault - data below normal level
E130Battery voltage fault - data above normal level
E775Sensor Supply Voltage 1 (+5V)
E781Sensor Supply Voltage 3 (+5V) — Data erratic, intermittent or inconect
E795Sensor Supply Voltage 2 — Data erratic, intermittent or inconect
Injector wiring / harness 4
Speed / position sensors 6
E002Engine speed (crankshaft position) sensor - data erratic, (target disc tooth signal missing)
E718Engine position sensor fault (camshaft sensor) - abnormal pulse width or frequency
E719Engine speed (crankshaft position) sensor fault - no signal
E720Engine speed (crankshaft position) sensor - data erratic (target disc gap signal missing)
E755Engine position sensor — Mechanical system not responding or out of adjustment
E759Engine Speed Sensor — Mechanical system not responding or out of adjustment
Water in fuel 3
ECU internal 9
E001Engine ECU warning
E091Engine ECU fault - data erratic
E708Engine control module main relay fault - relay not responding correctly
E757ECU Power Output Supply #2 — Cunent below normal or open circuit
E758ECU Power Output Supply #2 — Cunent above normal or grounded circuit
E796ECU Power Output Supply #2 — Voltage below normal or shorted to low source
E797ECU Power Output Supply #1 — Voltage below normal or shorted to low source
E798ECU Power Output Supply #1 — Cunent below normal or open circuit
E799ECU Power Output Supply #1 — Cunent above normal or grounded circuit
Other / uncategorised 27
E014Engine Oil Pressure — Voltage above normal or shorted to high source
E015Engine Oil Pressure — Voltage below normal or shorted to low source
E040Vehicle Speed Sensor Fault — Data erratic, intermittent or incorrect
E041Vehicle Speed Sensor Circuit — Data abnormal rate of change
E159Cylinder power imbalance - data erratic
E202Minimum drive pulse drift (inj #2) — Mechanical system not responding or out of adjustment
E204Minimum drive pulse drift (inj #3) — Mechanical system not responding or out of adjustment
E704Engine knock sensor fault - abnormal pulse width or frequency
E714Cruise Control Set Speed — Mechanical system not responding or out of adjustment
E733Maintenance Lamp — Voltage below normal, or shorted to low source
E734Maintenance Lamp — Current below normal or open circuit
E735Maintenance Lamp — Current above normal or grounded circuit
E737Engine knock sensor fault
E746Auxiliary Output #2 (Oil Pressure Gauge ! Lamp)) — Voltage below normal or shorted to low source
E749Auxiliary Output #2 (Oil Pressure Gauge • Lamp)) — Current below normal or open circuit
E750Auxiliary Output #2 (Oil Pressure Gauge • Lamp)) — Current above normal or grounded circuit
E751Malfunction Indicator Lamp — Voltage above normal, or shorted to high source
E752Maintenance Lamp — Voltage above normal, or shorted to high source
E756Vehicle Speed Sensor Fault — Voltage below normal or shorted to low source
E773Malfunction Indicator Lamp — Current above normal or grounded circuit
E782Malfunction Indicator Lamp — Voltage below normal, or shorted to low source
E783Malfunction Indicator Lamp — Current below normal or open circuit
E785Vehicle Speed Sensor Fault — Current below normal or open circuit
E789Vehicle Speed Sensor Fault — Current above normal or grounded circuit
E790Vehicle Speed Sensor Fault — Mechanical system not responding or out of adjustment
E791Vehicle Speed Sensor Fault — Voltage above normal or shorted to high source
E793Auxiliary Output #2 (Oil Pressure Gauge 1 Lamp)) — Voltage above normal or shorted to high source
No code matches that filter. Search parts or request a quote instead.
JCB error codes — FAQ
What are JCB 3CX & 3DX error codes?
They are fault codes (E-codes) that the engine ECU (electronic control unit) stores when it detects a problem with a sensor, circuit or component. They identify which system is affected and are read with JCB diagnostic tools.
How are JCB fault codes read?
The codes are indicated on the machine display and read in detail using the JCB engine diagnostic tool connected to the ECU, which also shows live data for active faults.
Does an error code mean I need a new part?
Not always. A code points to the affected system or sensor, but the fault can be wiring, a connector, a sensor or a component. Diagnosis confirms the cause before a part is replaced. Once the part is confirmed, Heavy Duty Parts can supply it — request a quote by part number.
Can I clear a JCB error code myself?
Many codes clear once the underlying fault is resolved and the ECU re-checks the circuit. Clearing a code is not the same as fixing the fault — diagnosis and repair should be carried out by a qualified technician using JCB diagnostic equipment.
Do these codes apply to both the JCB 3CX and 3DX?
Yes. These are the engine ECU fault codes used on JCB 3CX and 3DX backhoe loaders.
Need the part behind a fault?
Once a fault is diagnosed, send us the part number — we supply JCB 3CX & 3DX parts across South Africa, quote-led.
