Modern AGCO tractors use an onboard diagnostic system to monitor the engine, transmission, hydraulic system, electrical components, emissions system, and other critical functions. When a fault is detected, the tractor displays an error code that helps identify the affected system.
AGCO Tractor Error Codes
| Error Code | Description | Possible Causes | Recommended Solution |
|---|---|---|---|
| SPN 84 FMI 9 | Wheel speed sensor communication error | Faulty speed sensor, damaged wiring | Inspect sensor and wiring, replace if necessary |
| SPN 84 FMI 2 | Wheel speed signal erratic | Loose connector, sensor failure | Clean connectors and replace sensor |
| SPN 91 FMI 3 | Accelerator pedal voltage high | Failed throttle sensor | Test and replace pedal sensor |
| SPN 91 FMI 4 | Accelerator pedal voltage low | Wiring issue, sensor failure | Repair wiring or replace sensor |
| SPN 96 FMI 1 | Fuel pressure low | Dirty fuel filter, weak fuel pump | Replace filters and inspect pump |
| SPN 96 FMI 18 | Fuel pressure below normal | Fuel restriction, air in fuel system | Bleed fuel system and replace filters |
| SPN 100 FMI 1 | Engine oil pressure low | Low oil level, worn oil pump | Check oil level and inspect lubrication system |
| SPN 100 FMI 3 | Oil pressure sensor voltage high | Faulty sensor | Replace oil pressure sensor |
| SPN 102 FMI 3 | Intake manifold pressure high | MAP sensor fault | Inspect and replace sensor |
| SPN 102 FMI 4 | Intake manifold pressure low | Vacuum leak, failed sensor | Repair leak or replace sensor |
| SPN 110 FMI 0 | Coolant temperature high | Overheating engine | Check coolant level and radiator |
| SPN 110 FMI 15 | Engine overheating warning | Cooling fan failure | Inspect cooling system |
| SPN 132 FMI 3 | Battery voltage high | Faulty alternator regulator | Test charging system |
| SPN 132 FMI 4 | Battery voltage low | Weak battery, charging issue | Charge battery and inspect alternator |
| SPN 157 FMI 18 | Injector metering rail pressure low | Fuel pump issue | Test fuel system |
| SPN 1636 FMI 3 | Turbo actuator voltage high | Failed turbo actuator | Inspect actuator and wiring |
| SPN 1636 FMI 4 | Turbo actuator voltage low | Wiring fault | Repair harness |
| SPN 164 FMI 0 | Injector pressure abnormal | Fuel delivery issue | Check injectors and fuel pump |
| SPN 171 FMI 3 | Ambient air temperature sensor high | Sensor fault | Replace sensor |
| SPN 171 FMI 4 | Ambient air temperature sensor low | Open circuit | Repair wiring |
| SPN 172 FMI 3 | Intake air temperature high voltage | Failed sensor | Replace sensor |
| SPN 172 FMI 4 | Intake air temperature low voltage | Wiring issue | Inspect harness |
| SPN 174 FMI 0 | Fuel temperature high | Restricted fuel flow | Check cooling and fuel lines |
| SPN 175 FMI 0 | Engine oil temperature high | Heavy load, cooling issue | Reduce load and inspect cooling system |
| SPN 190 FMI 0 | Engine speed abnormal | Faulty crankshaft sensor | Inspect engine speed sensor |
| SPN 190 FMI 8 | Engine speed signal lost | Failed crank sensor | Replace sensor |
| SPN 2791 FMI 7 | EGR valve stuck | Carbon buildup | Clean or replace EGR valve |
| SPN 3031 FMI 9 | DEF pump communication fault | Wiring issue | Check harness and controller |
| SPN 3216 FMI 20 | DEF quality poor | Contaminated DEF | Drain and refill with fresh DEF |
| SPN 3226 FMI 20 | NOx conversion low | SCR catalyst issue | Inspect SCR system |
| SPN 3246 FMI 0 | DEF dosing valve fault | Injector blockage | Clean or replace DEF injector |
| SPN 3364 FMI 2 | DEF tank level sensor fault | Sensor failure | Replace sensor |
| SPN 3516 FMI 4 | Turbo boost pressure low | Boost leak | Inspect hoses and turbocharger |
| SPN 3521 FMI 4 | Turbo actuator fault | Actuator failure | Replace actuator |
| SPN 411 FMI 3 | Throttle position sensor voltage high | Sensor malfunction | Replace TPS |
| SPN 411 FMI 4 | Throttle position sensor voltage low | Wiring damage | Repair wiring |
| SPN 4334 FMI 18 | Diesel particulate filter soot high | Excessive soot accumulation | Perform parked regeneration |
| SPN 4334 FMI 0 | DPF regeneration required | Normal soot buildup | Start regeneration cycle |
| SPN 4364 FMI 18 | DPF regeneration unsuccessful | Failed regen | Inspect DPF and sensors |
| SPN 5246 FMI 0 | Engine protection derate active | Critical engine fault | Diagnose active engine faults |
| SPN 5394 FMI 5 | SCR efficiency low | DEF system problem | Inspect SCR components |
| SPN 641 FMI 9 | ECU communication error | CAN bus issue | Inspect CAN wiring |
| SPN 639 FMI 9 | CAN communication failure | Faulty ECU or wiring | Test CAN network |
| SPN 651 FMI 5 | Starter relay fault | Bad relay | Replace starter relay |
| SPN 677 FMI 3 | Transmission oil pressure sensor high | Sensor failure | Replace sensor |
| SPN 677 FMI 4 | Transmission oil pressure sensor low | Low transmission pressure | Check hydraulic system |
| SPN 723 FMI 5 | PTO speed sensor fault | Sensor failure | Replace PTO sensor |
| SPN 724 FMI 5 | PTO clutch fault | Worn clutch | Inspect PTO assembly |
| SPN 731 FMI 2 | Hydraulic oil temperature sensor erratic | Loose connector | Repair wiring |
| SPN 731 FMI 3 | Hydraulic oil temperature high | Overloaded hydraulics | Allow system to cool |
| SPN 789 FMI 5 | Hydraulic pump pressure fault | Pump wear | Test hydraulic pump |
| SPN 904 FMI 19 | Engine synchronization error | Camshaft/crankshaft timing issue | Inspect timing sensors |
| SPN 1077 FMI 3 | Fuel rail pressure sensor high | Sensor malfunction | Replace sensor |
| SPN 1077 FMI 4 | Fuel rail pressure sensor low | Wiring problem | Inspect wiring |
| SPN 1180 FMI 3 | Clutch pedal sensor high | Sensor issue | Replace clutch switch |
| SPN 1180 FMI 4 | Clutch pedal sensor low | Wiring fault | Repair connector |
| SPN 1569 FMI 31 | Engine derate active | Engine protection mode | Repair underlying engine fault |
| SPN 157 FMI 0 | Injector pressure abnormal | Fuel restriction | Inspect injectors |
| SPN 168 FMI 3 | System voltage high | Charging system fault | Test alternator |
| SPN 168 FMI 4 | System voltage low | Weak battery | Charge or replace battery |
Note: The exact code descriptions may vary slightly depending on the tractor model, engine manufacturer (AGCO Power, SISU, Cummins, etc.), and production year. Always verify with your operator’s or service manual.
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Most Common AGCO Tractor Error Codes
SPN 96 FMI 1 – Low Fuel Pressure
This code indicates that the engine is not receiving sufficient fuel pressure. The most common causes include clogged fuel filters, air entering the fuel system, contaminated fuel, or a failing lift pump.
SPN 110 FMI 0 – Engine Coolant Temperature High
An overheating engine can quickly cause severe damage. Check coolant levels, radiator cleanliness, thermostat operation, cooling fan, and water pump before continuing operation.
SPN 4334 FMI 18 – DPF Soot Level High
This fault means the diesel particulate filter has accumulated excessive soot. Perform a parked regeneration as soon as possible. Ignoring this warning may result in engine derating.
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SPN 3216 FMI 20 – DEF Quality Poor
Poor-quality or contaminated Diesel Exhaust Fluid is a common cause of emissions-related faults. Always use fresh DEF that meets ISO 22241 standards.
SPN 639 FMI 9 – CAN Communication Failure
Modern AGCO tractors rely on the Controller Area Network (CAN) for communication between electronic modules. Damaged wiring, loose connectors, or a failed ECU can trigger this code.
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How to Clear AGCO Tractor Error Codes
Many temporary error codes will disappear automatically once the underlying issue has been repaired. For persistent faults:
- Turn off the tractor and remove the ignition key.
- Repair the component causing the fault.
- Restart the tractor.
- Allow the system to perform a self-test.
- Use a compatible diagnostic scanner if the code remains active.
- Perform any required regeneration or calibration procedures.
- If the code immediately returns, further diagnosis is necessary.
Never clear a code without correcting the underlying problem, as this may lead to recurring faults or additional damage.
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Preventing AGCO Tractor Error Codes
Routine maintenance is the best way to minimize diagnostic faults. Replace engine oil, hydraulic fluid, and filters at the recommended service intervals.
Keep electrical connectors clean and dry, inspect wiring harnesses for wear, and use high-quality diesel fuel and DEF where applicable. Regularly monitor coolant levels, battery voltage, and tire speed sensors to catch minor issues before they become major repairs.
Final words
AGCO tractor error codes provide valuable diagnostic information that helps identify problems before they cause serious equipment damage. While some codes indicate simple issues such as a loose connector or dirty filter, others warn of critical engine, transmission, hydraulic, or emissions faults that require immediate attention.
Understanding the meaning of each error code allows operators to troubleshoot problems faster, reduce downtime, and keep their AGCO tractor operating safely and efficiently. When a fault persists after basic troubleshooting, consult an authorized AGCO technician or use a professional diagnostic tool for a more detailed analysis.
