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.
Four-Wheel Drive (4WD) Systems DTCS
Diagnostics in this service information assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to Diagnostic Methods for information about these practices.
| DTC | Description | Action |
|---|---|---|
| P164D | AWD ID Block Corrupted, Not Programmed | CLEAR the DTC. REPEAT the self-test. If the DTC returns, PROGRAM the PCM with the Active Torque Coupling (ATC) solenoid bar code information. REFER to Automatic Torque Coupling (ATC) Configuration . |
| P181F | Clutch Control System Performance | This an internal AWD relay module fault. INSTALL a new AWD relay module. REFER to All Wheel Drive (AWD) Relay Module . |
| P182B | Transfer Case Fluid Temperature Sensor Circuit Range/Performance | GO to Pinpoint Test B . |
| P182C | Transfer Case Fluid Temperature Sensor Circuit Low | GO to Pinpoint Test B . |
| P182D | Transfer Case Fluid Temperature Sensor Circuit High | GO to Pinpoint Test B . |
| P187B | Tire Size Out of Acceptable Range - AWD Disabled / Limited Function | GO to Pinpoint Test C . |
| P188B | AWD Clutch Control Circuit | GO to Pinpoint Test D . |
| P188C | AWD Relay Module Communication Circuit | CLEAR the DTCs. REPEAT the self-test. If DTC returns, GO to Pinpoint Test E . |
| P188D | AWD Relay Module Feedback Circuit | CLEAR the DTCs. REPEAT the self-test. If DTC returns, GO to Pinpoint Test E . |
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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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