7 Main AGCO Tractor Error Codes and Solutions (2025)

AGCO tractors—including Massey Ferguson, Fendt, Challenger, Valtra, and AGCO Allis—are known for their advanced electronics, CAN-bus systems, and diagnostic capabilities. With this sophistication comes the need to understand and respond to error codes that can stop your work, from PTO sensor faults to engine, hydraulic, and transmission warnings. This guide offers a deep dive into AGCO tractor error codes, their meaning, practical solutions, and maintenance tips to keep your machine running smoothly.

Table of Contents

Understanding AGCO Tractor Error Codes: The Basics

Modern AGCO tractors use digital displays, ECU (engine control unit), and CAN-bus networks to report issues. You’ll encounter codes in various formats:

SPN/FMI Codes: Standard diagnostic codes used across most AGCO machines.
- SPN = Suspect Parameter Number (component, like “engine speed sensor”)
- FMI = Failure Mode Identifier (type of fault, like “high voltage”)
E-Codes: Simpler error reporting, commonly used on older or mid-range machines (e.g., E23, E71).
Module-specific Codes: CCU (Central Control Unit), EIC (Electronic Interface Controller), PTR (Powertrain), ICC (Instrument Cluster Controller), and more.

Accessing codes may require using the display menu, diagnostic tools (AGCO EDT, TechTouch, Jaltest), or reading visual blinks/sequences from dash displays.

Common AGCO Error Codes, Causes, and Practical Solutions

Below is a structured overview of real-world AGCO error codes grouped by major system, with troubleshooting steps for each.

1. Powertrain & Transmission Errors

Key Codes:

001638.00 – Transmission Hydraulic Oil Temperature Is Very High (CCU)
001638.03/.04 – Transmission Hydraulic Oil Temperature Sensor Voltage High/Low
000630.14 – Rear PTO Speed Issue Detected
000191.00/.17 – Transmission Speed Sensor Out of Range During Calibration
522456.31 – Manual Gear Change Without Clutch

Causes:

Overheating due to worn clutch packs, low fluid, blocked filters
Sensor failure, wiring harness corrosion, voltage issues
Operator not using clutch as required

Solutions:

Check fluid levels regularly; top up with OEM hydraulic oil.
Clean/replace transmission filters and inspect for debris in the sump.
Inspect wiring for loose connections, wear, or corrosion—especially at sensors.
Reset system: Turn off tractor, wait 1 minute, restart. Clear minor faults.
Calibrate transmission following manufacturer procedures after servicing.

2. PTO and Hydraulic System Errors

Key Codes:

001883.00 – Rear PTO Overspeed Detected
524252.05 – PTO Circuit Voltage Issue
E41 – Hydraulic Oil Temperature Too High
E51 – PTO Speed Sensor Fault

Causes:

Mechanical wear in PTO, sensor faults, operator error (engaging PTO under load)
Low or contaminated hydraulic oil
Overuse, blocked lines, or air in system

Solutions:

Inspect and replace PTO speed sensor: Check wiring and alignment.
Ensure correct hydraulic fluid type and level; change if contaminated.
Clean hydraulic/return filters; inspect pump/fan operation.
Monitor operator usage: Always engage PTO at correct speed, avoid aggressive engagement.

3. Electrical System & Battery Errors

Key Codes:

523316.04 – Low Module Switched 12 Volt Supply Voltage
E71 – Battery Voltage Out of Range
000167.04 – Low Battery/Alternator Voltage

Causes:

Old battery, failing alternator, poor ground connection, loose terminals
Sensor wiring issues, corroded plug connectors

Solutions:

Test battery: Replace if voltage drops below recommended specs, especially under load.
Inspect alternator, wiring, and connectors: Tighten, clean, or replace as needed.
Use dielectric grease on connectors to prevent future corrosion.
Check fuses and relays, replace blown units.

4. Sensor and ECU/Module-related Codes

Key Codes:

003509.03/.04 – 5 Volt Sensor Supply High/Low Voltage
000096.03/.04 – Fuel Level Sender High/Low Voltage
000628.02 – Internal Module Error When Booting Up (EIC)
000237.02 – Stored Tractor Configuration Data Error

Causes:

Sensor failure, supply voltage out of spec (possibly due to alternator or battery fault)
Software/data errors during power cycle
Faulty or damaged control module

Solutions:

Inspect supply voltage with a multimeter; address root electrical issue first.
Check and replace faulty sensors.
Update/reflash ECU firmware if persistent boot errors occur (requires dealer/service technician).
Re-seat/inspect ECU physical connections for corrosion/damage.
Clear codes after repairs with a diagnostic tool or through display reset function.

5. Operator Safety and Seat Switch Errors

Key Codes:

002818.31 – Operator Seat Switch Not Activated With PTO On
001504.10 – Driver Present Seat Switch Issue

Causes:

Defective seat switch, wiring problem
Operator left seat with PTO running (safety violation)

Solutions:

Check seat switch for physical damage or stuck contacts.
Test with a multimeter; replace failed switch.
Educate operators on safety routines (never leave seat with PTO engaged).

6. Emissions (AdBlue/SCR) System Errors

Key Codes:

SPN4090 FMI18 – NOx Control System/AdBlue Level Implausible (Valtra)
"Urea quality doesn't reply to Agco Power recommendation"

Causes:

Substandard AdBlue/DEF fluid
Faulty NOx sensor, AdBlue injection anomalies
SCR system software error

Solutions:

Use only recommended AdBlue/DEF; drain, flush, refill if fluid is questionable.
Replace NOx sensor or test wiring/routes.
Update/reprogram EEM4/EECU software to correct logic errors (dealer support required).
Override limp mode if software update required, but only as a last resort.

7. Common CHALLENGER Tractor Errors (Examples)

Codes & Solutions:

T4107 – Faulty oil pressure sensor high: Replace or test oil pressure sensor
T4124 – Parking brake sensor: Test, adjust, or replace sensor and wiring
E9172-E9244 – Starter relay/module faults: Check relay connection, module IDs, or contact dealer
E9303 – Cruise control fault: Inspect system wiring and controls

Diagnostic Tools & Reading Codes

Built-in Display Navigation: Most AGCO tractors allow scrolling through fault codes via up/down arrows on the left screen; “dcerr” (dash errors), “tcerr” (transmission errors)
Dealer-Specific Tools: AGCO EDT, Jaltest, and TechTouch for advanced diagnostics, code clearing, and system recalibration.
Basic Diagnostic Steps:
1. Record the full code, including SPN/FMI or E-Code
2. Inspect affected system for obvious faults (fluid levels, wiring, sensors)
3. Perform basic reset (full power down, restart)
4. If code persists or controls are impacted, escalate with diagnostic scan tool or contact service

Preventive Maintenance Tips

Modern AGCO tractors depend heavily on sensor health, clean power supply, and proper fluid levels for trouble-free operation:

Replace filters on schedule (fuel, oil, hydraulic, air)
Clean connectors regularly, especially under harsh or wet conditions
Check battery and charging system status each month
Use only OEM sensors, fluids, and calibration parts
Avoid overheating and operating in limp mode; address DPF and DEF errors immediately

Sample Table: Critical AGCO Error Codes, Systems, and Solutions

Error Code	System/Area	Meaning/Problem	Common Solution
001638.00	Transmission Hydro Oil Temp (CCU)	Oil Temp Very High	Check/fluid/filter, cool down, replace
001883.00	PTO (CCU)	Rear PTO Overspeed	Inspect shaft/sensor, reset PTO
003509.03/.04	Supply Voltage (CCU)	5V Sensor Supply High/Low	Check battery/wiring, replace sensor
523316.04	Electrical System	Low 12V Supply Voltage	Test battery/alternator, fix grounds
000096.03/.04	Fuel System	Fuel Sender High/Low Voltage	Replace sender, check wiring
524252.05	Hydraulic System	PTO Circuit Voltage Issue	Fluid level, inspect circuit
000630.14	Transmission (CCU)	Rear PTO Speed Error	Inspect/replace speed sensor
SPN4090 FMI18	Emissions (SCR/AdBlue)	NOx/AdBlue System Anomaly	Replace sensor, use correct AdBlue
T4107/T4124/E9172-E9244	Challenger Tractor	Oil pressure/parking brake/starter module	Replace corresponfing sensors/modules

Advanced Troubleshooting: When to Call a Technician

Repeated SPN/FMI codes: Indicates persistent sensor or CAN-bus fault.
Transmission/engine won’t calibrate: Further diagnostic and possibly software update required.
Hydraulic, PTO, or emissions codes with limp mode: Dealer service tools and ECU reprogramming may be necessary.
Codes linked to airbag, steering, or critical engine functions: Shut down tractor and consult dealer immediately.

Conclusion

AGCO tractors offer industry-leading performance—but diagnosing error codes is critical to reliability and uptime. Whether you’re confronting hydraulic, transmission, electrical, safety, or emissions faults, begin with the basics: record error codes, inspect affected systems, reset the display, and escalate with dealers when needed.

Routine maintenance, clean electronics, and fast response to warning codes keep your tractor safe and profitable throughout each season. Bookmark your diagnostic codes and troubleshooting steps for reference—and always use trusted AGCO service resources for deeper repairs.

If you encounter a code not referenced here, you can search thousands of codes using online AGCO or dedicated tractor error code databases, or consult AGCO service manuals for specifics.

References

David Holtzman

I’m David man behind Lawn Mowerly; I’ve been dealing with lawnmowers and Tractors with my father since I was a kid. I know every make and model and what each one is capable of and love helping people find the perfect equipment for their needs.