Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2021EDGE SE, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 10 (ENGINE CONTROLS - DIAGNOSTIC METHODS (DIESEL))DRIVE CYCLESEXHAUST FLUID SYSTEM FAULT PROCEDUREEXHAUST FLUID SYSTEM FAULT PROCEDURE - ALL OTHERSDEF FAULT SPEED LIMITED PROCEDURE
2021 Ford Edge SE, 4WD
DEF Fault Speed Limited Procedure
2021 Ford Edge SE, 4WDSECTION DEF Fault Speed Limited Procedure
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2018 Ford Transit-350 HD, 2018 Ford Transit-350, 2018 Ford Transit-250, 2018 Ford Transit-150, and 2018 Ford F-550 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
If the DEF Fault messages do not clear when the diesel exhaust fluid tank is refilled, carry out the following procedure using the scan tool.
Carry out the DEF Fault inducement clearing procedure to allow the vehicle to exit the speed limited mode when any of the following messages are present:
- DEF Fault Speed Limited to XX MPH in XX MI
- DEF Fault Speed Limited to XX MPH Upon Restart
- DEF Fault Speed Limited to XX MPH
- DEF Fault Engine Idled Soon
- Monitor the EGT12, EGT13, EGT14, REDUCT_INJ_DC and REDUCT_TNK_LV PIDs. Add up to 9.46L (2.5 Gal) of diesel exhaust fluid until the REDUCT_TNK_LV PID reads 100%.
- Run the vehicle until the EGT12 and EGT13 PIDs read greater than 200°C (392°F) and EGT14 PID reads greater than 225°C (437°F).
- Shut off the engine for a minimum of 2 minutes, then restart the engine.
- Dosing injection will begin and may continue for up to 5 minutes. Monitor the REDUCT_INJ_DC PID until it reads 0 for greater than 30 seconds.
- Carry out 5 acceleration events from 0 to 24.14 km/h (0 to 15 mph). Bring the vehicle to a stop. Idle with the transmission in PARK (neutral for M/T) for a minimum of 30 minutes.
- The DEF Fault Speed Limited message should clear.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.