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 MANUALSFORD2021EXPEDITION PLATINUM, RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 50 (FOUR-WHEEL DRIVE SYSTEMS)
2021 Ford Expedition Platinum, RWD
Section 50 (Four-Wheel Drive Systems)
2021 Ford Expedition Platinum, RWDSECTION Section 50 (Four-Wheel Drive Systems)
WARNING: This page is about a different car, the 2018 Ford F-550 Super Duty, 2018 Ford F-450 Super Duty, 2018 Ford F-350 Super Duty, and 2018 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
- Description And Operation
- Four-Wheel Drive Systems - Overview
- Four-Wheel Drive Systems - System Operation and Component Description
- System Operation
- Manual Shift-On-Stop (MSOS) System
- To shift from 2H (4X2) to 4H (4X4 HIGH):
- To shift from 4H (4X4 HIGH) to 2H (4X2):
- To shift from 2H (4X2) or 4H (4X4 HIGH) to 4L (4X4 LOW):
- To shift from 4L (4X4 LOW) to 4H (4X4 HIGH) or 2H (4X2):
- Electronic Shift-On-The-Fly (ESOF) System
- Electronic Locking Differential (ELD) System
- ELD Engagement Speeds - 4WD Vehicles
- System Operation
- Diagnosis And Testing
- Four-Wheel Drive Systems - Electronic Shift
- Principles of Operation
- Inspection and Verification
- DTC Chart: Transfer Case Control Module (TCCM)
- Symptom Chart(s)
- Pinpoint Tests
- Pinpoint Test A : DTC (Diagnostic Trouble Code) P0562:00
- Pinpoint Test B : DTC (Diagnostic Trouble Code) P0563:00
- Pinpoint Test C : The 4WD Mode Indicators Do Not Operate Correctly
- Pinpoint Test D : The Vehicle Does Not Shift Between 2H And 4H Modes Correctly
- Pinpoint Test E : The Vehicle Does Not Shift Between 4H And 4L Modes Correctly
- Pinpoint Test F : The Front Axles Do Not Engage/Disengage Correctly
- Pinpoint Test G : The 4WD Does Not Engage At Speed Correctly
- Pinpoint Test H : The Transfer Case Jumps Out Of Gear
- Pinpoint Test I : Vehicle Pulsates Or Shudders In A Straight Line (STRAIGHTLINE Driveline Wind Up)
- Pinpoint Test J : Electronic Shift-On-The-Fly (ESOF) System Functional Test
- Pinpoint Test K : U0100
- Pinpoint Test L : U0101:00
- Pinpoint Test M : U0121:00
- Pinpoint Test N : U0140:00
- Four-Wheel Drive Systems - Mechanical Shift
- Principles of Operation
- Inspection and Verification
- Symptom Chart(s)
- Pinpoint Tests
- Pinpoint Test A : The Four-Wheel Drive (4WD) Indicators Do Not Operate Correctly
- Pinpoint Test B : The Vehicle Does Not Shift Between 2H And 4H Modes Correctly
- Pinpoint Test C : The Vehicle Does Not Shift Between 4H And 4L Modes Correctly
- Pinpoint Test D : The Transfer Case Jumps Out Of Gear
- Pinpoint Test E : Vehicle Pulsates Or Shudders In A Straight Line (Straight Line Driveline Wind Up)
- Pinpoint Test F : MSOS Functional Test
- Four-Wheel Drive Systems - Electronic Shift
- Removal And Installation
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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.