Aftertreatment Inducement Derate Active

Common Symptoms

• Tractor speed drops to a crawl, typically limited to 5 mph or less regardless of throttle position
• Engine power feels severely reduced, as if running on half throttle no matter what you do
• Warning light and red stop lamp are both lit on the instrument cluster at the same time
• Fault code 5246-15 appears on the dashboard display or when connected to AGCO EDT
• DEF warning indicator has been active for an extended period before this derate triggered
• PTO engagement may cut out or refuse to engage at full rated speed
• Tractor may be unable to pull normal field loads without the engine lugging down immediately

Probable Causes (Ranked by Likelihood)

• DEF tank was run empty or near-empty and prior low-DEF warning codes were not corrected within the EPA-mandated time window Very Likely
• SCR dosing injector has failed or is clogged, preventing DEF from being injected into the exhaust stream, causing the system to trigger inducement after repeated dosing faults Very Likely
• DEF quality sensor (urea concentration out of range) detected a diluted or contaminated DEF supply, and the fault was ignored long enough to reach the inducement threshold Likely
• SCR catalyst temperature sensor fault or NOx sensor failure reported an out-of-range condition that the ECM could not clear, accumulating fault time toward inducement Likely
• DEF supply pump or DEF lines have a blockage or leak, causing repeated DEF system pressure faults that finally triggered inducement Possible
• CAN communication fault between the aftertreatment controller and the main engine ECM caused the SCR system to report persistent failure status Possible
• Tampering or removal of SCR components detected by the ECM, which automatically triggers inducement per EPA regulations Less Likely

Step-by-Step Diagnostic Procedure

1. Connect AGCO EDT to the tractor's diagnostic port and pull the full fault code list. Write down every active and stored SPN/FMI code. You are looking for companion codes in the 3364, 4334, 3515, 3031, or 5246 range that triggered inducement. The 5246-15 code itself is a symptom of those underlying faults, not the root cause.

2. Check the DEF tank level first. If it is below 10 percent, fill it with fresh, certified DEF (ISO 22241 standard, 32.5 percent urea). Do not use water or off-brand fluid. A low or empty tank is the single most common reason inducement activates.

3. Inspect the DEF tank fill cap and the fluid itself. Good DEF is clear to very slightly blue-tinted. If it is yellow, cloudy, or smells strongly of ammonia, drain the tank completely, flush with distilled water, and refill with fresh DEF. Contaminated DEF triggers concentration faults that accumulate toward inducement.

4. With AGCO EDT connected, navigate to the aftertreatment section and check the DEF dosing injector status. If the injector shows a fault, remove it and inspect the tip for crystallized DEF deposits. Soak the tip in warm water to dissolve any buildup. A faulty injector that has been logged as failed repeatedly is a primary driver of inducement.

5. Check the NOx sensors (upstream and downstream of the SCR) and the DEF quality sensor for open-circuit or out-of-range faults in AGCO EDT. A failed NOx sensor on the outlet side will make the ECM believe the SCR is not reducing emissions, and it will log conversion efficiency faults. Sensor replacement requires no special tools beyond a wrench and basic electrical test equipment.

6. Measure the DEF supply pressure using AGCO EDT live data or a mechanical gauge at the dosing injector supply line. Operating pressure should be approximately 9 bar (130 psi) when the system is running. Low pressure points to a failing DEF supply pump or a clogged DEF filter. Replace the DEF filter first as it is the cheapest fix.

7. After correcting any underlying faults, use AGCO EDT to perform an aftertreatment system reset and clear all stored codes. The inducement derate will NOT clear by simply cycling the key. The ECM requires a confirmed diagnostic clear through AGCO EDT once all root-cause faults are resolved. If the derate does not lift after clearing, the system needs a dealer-level inducement override, which requires AGCO EDT with a dealer-level license.

8. If you cannot identify the root cause with the steps above, or if the derate returns within one operating cycle after clearing, stop field work and call your AGCO dealer. Continued operation under inducement puts extreme stress on the drivetrain and risks additional faults.

Frequently Asked Questions