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.
2003 Lincoln Aviator RWDFACTORY OEM SERVICE PROCEDURE
Transfer Case DTCS
TRANSFER CASE (FOUR-WHEEL DRIVE CONTROL MODULE) DIAGNOSTIC TROUBLE CODE INDEX
| DTC | Description | Source | Action |
|---|---|---|---|
| B1317 | Battery Voltage High | 4WD Control Module | Refer to BATTERY & CHARGING SYSTEM . |
| B1318 | Battery Voltage Low | 4WD Control Module | Refer to BATTERY & CHARGING SYSTEM . |
| B1342 | ECU Defective | 4WD Control Module | CLEAR the DTCs. REPEAT the 4x4 module. REPEAT the self test. If DTC B1342 is retrieved, INSTALL a new 4x4 module. REFER to FOUR-WHEEL DRIVE (4WD) CONTROL MODULE . CLEAR the DTCs. REPEAT the self test. |
| B2105 | Throttle Position (TP) Input Out of Range - Low | 4WD Control Module | REFER to SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE . |
| B2106 | Throttle Position (TP) Input Out of Range - High | 4WD Control Module | REFER to SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE |
| P1824 | 4WD Clutch Relay Circuit Failure | 4WD Control Module | Go To PINPOINT TEST B . |
| P1826 | Transmission 4-Wheel Drive Low Clutch Relay Short Circuit to Battery | 4WD Control Module | Go To PINPOINT TEST B . |
| P1827 | Transmission 4-Wheel Drive Low Clutch Relay Short Circuit to Ground | 4WD Control Module | Go To PINPOINT TEST B . |
| U1900 | CAN Communication BUS fault | 4WD Control Module | Refer to MODULE COMMUNICATIONS NETWORK . |
| U1950 | UBP Communication BUS Fault | 4WD Control Module | Refer to MODULE COMMUNICATIONS NETWORK . |
| U2023 | External Node Fault | 4WD Control Module | Refer to MODULE COMMUNICATIONS NETWORK . |
| U2306 | Invalid UBP Data From Instrument Cluster (Node 60) | 4WD Control Module | Refer to MODULE COMMUNICATIONS NETWORK . |
| U2226 | Invalid UBP Data From PCM (Node 10) | 4WD Control Module | Refer to MODULE COMMUNICATIONS NETWORK . |
Factory Service Tools
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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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