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.
2021 Ford Explorer TimberlineFACTORY OEM SERVICE PROCEDURE
Four-Wheel Drive Systems
- Description And Operation
- Diagnosis And Testing
- Four-Wheel Drive Systems - Vehicles Built Up To: 11-August-2020
- Diagnostic Trouble Code (DTC) Chart
- Symptom Chart
- Symptom Chart - NVH
- Pinpoint Tests
- Pinpoint Test A : B11D9:16 Or B11D9:17
- Pinpoint Test B : Lost Communication With BCM (Body Control Module)
- Pinpoint Test C : U2002:9E
- Pinpoint Test D : U2009:9E Or U3000:04
- Pinpoint Test E : AWD Module Power, Ground, Or Internal Fault
- Pinpoint Test F : C00A6:07
- Pinpoint Test G : Transfer Case Clutch Actuator
- Pinpoint Test H : C00A6:4B
- Pinpoint Test I : C00A6:54
- Pinpoint Test J : C00A6:66
- Pinpoint Test K : C00A7:11, C00A7:13, C00A7:17
- Pinpoint Test L : C00A8:11, C00A8:13, C00A8:17
- Pinpoint Test M : C0631:14
- Pinpoint Test N : C0631:17
- Pinpoint Test O : C0631:7E
- Pinpoint Test P : C0631:7F
- Pinpoint Test Q : Front Axle Disconnect Actuator Fads And FADM Circuits
- Pinpoint Test R : Front HALFSHAFT Speed Sensor
- Pinpoint Test S : Module Configuration Faults
- Pinpoint Test T : P1001, P1397, P1501, P1705
- Pinpoint Test U : P166E:00
- Pinpoint Test V : Lost Communication With Another Module
- Pinpoint Test W : Invalid Data Received From Another Module
- Pinpoint Test X : Incorrect Torque Transferred To Front Axle After Installing Transfer Case
- Pinpoint Test Y : The AWD (All Wheel Drive) Module Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test Z : The ATCM (All Terrain Control Module) Does Not Respond To The Diagnostic Scan Tool
- Pinpoint Test Aa : Front Axle Will Not Disconnect Or Front Axle Will Not Connect
- Pinpoint Test Ab : Front Axle Will Not Disconnect Or Front Axle Will Not Connect
- Pinpoint Test Ac : Front Axle Will Not Disconnect Or Front Axle Will Not Connect
- Pinpoint Test Ad : Front Axle Will Not Disconnect Or Front Axle Will Not Connect
- Pinpoint Test AE : Front Axle Will Not Disconnect Or Front Axle Will Not Connect
- Pinpoint Test AF : Front Axle Will Not Disconnect Or Front Axle Will Not Connect
- Pinpoint Test Ag : Front Axle Will Not Disconnect Or Front Axle Will Not Connect
- Pinpoint Test Ah : The Transfer Case Does Not Transfer Torque Correctly
- Pinpoint Test Ai : The Transfer Case Does Not Transfer Torque Correctly
- Pinpoint Test AJ : The Transfer Case Does Not Transfer Torque Correctly
- Pinpoint Test AK : The Transfer Case Does Not Transfer Torque Correctly
- Pinpoint Test Al : The Transfer Case Does Not Transfer Torque Correctly
- Pinpoint Test Am : Fluid Leak From Transfer Case
- Pinpoint Test An : Fluid Leak From Transfer Case
- Pinpoint Test AO : Fluid Leak From Transfer Case
- Pinpoint Test AP : Front Axle Binding On Sharp Turns On Dry Pavement
- Pinpoint Test AQ : 4WD Temporarily Locked Message Displayed
- Pinpoint Test Ar : 4WD Temporarily Locked Message Displayed
- Pinpoint Test As : Clicking/Whirring Noise From Transfer Case At Start Up
- Pinpoint Test At : Intermittent Tick Noise From FADA
- Pinpoint Test AU : The Transfer Case Makes Noise
- Pinpoint Test Av : Noise From The Front Axle
- Pinpoint Test Aw : Noise From The Front Axle
- Pinpoint Test Ax : Noise From The Front Axle
- Pinpoint Test AY : Noise From The Front Axle
- Pinpoint Test AZ : Noise From The Front Axle
- Pinpoint Test BA : Noise From The Rear Axle
- Four-Wheel Drive Systems - Vehicles Built From: 10-August-2020
- Diagnostic Trouble Code (DTC) Chart
- Symptom Chart
- Symptom Chart -- NVH
- Pinpoint Tests
- Pinpoint Test A : B11D9:16 Or B11D9:17
- Pinpoint Test B : Lost Communication With BCM (Body Control Module)
- Pinpoint Test C : U2002:9E
- Pinpoint Test D : U2009:9E Or U3000:04
- Pinpoint Test E : AWD Module Power, Ground, Or Internal Fault
- Pinpoint Test F : Transfer Case Clutch Actuator
- Pinpoint Test G : C00A6:4B
- Pinpoint Test H : C00A6:54
- Pinpoint Test I : C00A6:66
- Pinpoint Test J : C00A7:11, C00A7:13, C00A7:17
- Pinpoint Test K : C00A8:11, C00A8:13, C00A8:17
- Pinpoint Test L : Module Configuration Faults
- Pinpoint Test M : P1001, P1397, P1501, P1705
- Pinpoint Test N : P166E:00
- Pinpoint Test O : Lost Communication With Another Module
- Pinpoint Test P : Invalid Data Received From Another Module
- Pinpoint Test Q : Incorrect Torque Transferred To Front Axle After Installing Transfer Case
- Pinpoint Test R : The Transfer Case Does Not Transfer Torque Correctly
- Pinpoint Test S : The Transfer Case Does Not Transfer Torque Correctly
- Pinpoint Test T : The Transfer Case Does Not Transfer Torque Correctly
- Pinpoint Test U : The Transfer Case Does Not Transfer Torque Correctly
- Pinpoint Test V : Fluid Leak From Transfer Case
- Pinpoint Test W : Fluid Leak From Transfer Case
- Pinpoint Test X : Fluid Leak From Transfer Case
- Pinpoint Test Y : Front Axle Binding On Sharp Turns On Dry Pavement
- Pinpoint Test Z : 4WD Temporarily Locked Message Displayed
- Pinpoint Test Aa : 4WD Temporarily Locked Message Displayed
- Pinpoint Test Ab : Clicking/Whirring Noise From Transfer Case At Start Up
- Pinpoint Test Ac : The Transfer Case Makes Noise
- Four-Wheel Drive Systems - Vehicles Built Up To: 11-August-2020
- General Procedures
- Removal And Installation
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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