Your engine control module (ECU or ECM) is one of the most vital components of your agricultural equipment. It’s the brain behind fuel delivery, ignition timing, emissions control, throttle response, and more. When the ECU fails, your equipment becomes unreliable — or worse, completely inoperable.
At UpFix, we specialize in diagnosing and repairing ECU and ECM problems for tractors, combines, harvesters, sprayers, and other heavy-duty ag machines. Our repairs are fast, reliable, and plug-and-play ready.
🚜 Common Symptoms of ECU/ECM Failure
A faulty engine control module can mimic all kinds of mechanical issues — which makes misdiagnosis common. Look out for these warning signs:
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Engine won’t start or crank
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Injector misfires or cylinder cutouts
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Throttle pedal is unresponsive or erratic
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Frequent stalling or limp mode activation
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Persistent or flashing fault codes
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Poor fuel economy or sluggish performance
These issues are often blamed on wiring, fuel systems, or sensors — but the root cause could be your ECU.
🛑 Common Error Codes / Messages:
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SPN 651 FMI 5 – Engine controller not responding
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SPN 91 FMI 2 – Throttle signal fault
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SPN 157 FMI 18 – Injector misfire or circuit issue
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ECU 128 – General ECU failure
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SPN 639 FMI 2 – CAN communication failure
🔧 Common Symptoms:
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No crank / no start
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Throttle unresponsive
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Engine stalls or misfires
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Limp mode activation
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Active codes across multiple systems
🔍 What Causes ECU/ECM Failures?
ECUs in agricultural equipment operate under extreme conditions — including heat, moisture, vibration, and power fluctuation. Common failure points include:
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Overheating from engine bay temperatures
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Water intrusion or corrosion in the housing
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Cracked solder joints due to vibration
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Faulty or corroded connector pins
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Voltage spikes from jump-starting or failing alternators
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Short circuits or burnt components internally
These failures are not unusual — but they don’t require replacement in most cases. They can be professionally repaired.
🛠️ How UpFix Repairs ECUs
When you send your ECU to UpFix, our technicians perform:
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✅ Full diagnostic testing to identify specific circuit-level failures
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✅ Repair or replacement of damaged components (resistors, capacitors, ICs, power regulators, etc.)
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✅ Re-soldering and trace repair for damaged connections
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✅ Moisture and corrosion cleanup with protective coating re-application
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✅ Simulated bench testing to verify real-world functionality
Our goal is to return your ECU fully functional and plug-and-play ready — no reprogramming needed in most cases.
🔧 Common Equipment We Service
We repair ECUs and ECMs from major agricultural brands, including:
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John Deere
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Case IH
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New Holland
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Kubota
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AGCO / Massey Ferguson / Challenger
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Fendt, Claas, and others
Even if your ECU model isn’t listed on our site, we can likely repair it.
👉 Submit a Custom Repair Request
💰 Why Repair Instead of Replace?
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✅ Save up to 80% over the cost of a new or remanufactured ECU
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✅ No need for programming when returned — just install and go
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✅ Fast turnaround: Most repairs completed in 2–5 business days
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✅ Eco-friendly: Repairing reduces waste and saves your original part
📦 Ready to Start?
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Find your category and begin your repair order:
👉 Start Your Order -
Ship your ECU to UpFix using the label we provide
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We repair and test it in-house
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You receive it back, ready to install
📞 Still Have Questions?
Our team is happy to help.
Call or text us at 888-979-9343 or contact us online:
👉 Contact Us
💡 Trust UpFix for Your ECU Repair Needs
When your agricultural equipment suffers from engine control problems, don’t waste time or money on replacement modules. Let UpFix restore your ECU with expert-level service and full diagnostic testing — at a fraction of the cost.