DEF Fault Speed Limited Procedure
WARNING: This page is about a different car, the 2020 Ford F-550 Super Duty, 2020 Ford F-450 Super Duty, 2020 Ford F-350 Super Duty, 2020 Ford F-250 Super Duty, and 2020 Ford F-150. 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.