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.
4X4 Control Module DTC Chart
2008 Lincoln Navigator RWDSECTION 4X4 Control Module DTC Chart
WARNING: This page is about a different variant/trim than selected.
4X4 CONTROL MODULE DTC CHART
| DTC | Description | Source | Action |
|---|---|---|---|
| B1317 | Battery Voltage High | 4X4 Control Module | Go to Pinpoint Test B . |
| B1318 | Battery Voltage Low | 4X4 Control Module | Go to Pinpoint Test B . |
| B1342 | ECU is Defective | 4X4 Control Module | CLEAR the DTC. REPEAT the self-test. If DTC B1342 is retrieved, INSTALL a new 4X4 control module. REFER to 4X4 Control Module . REPEAT the self-test. |
| B1555 | Ignition Run/Start Circuit Failure | 4X4 Control Module | Go to Pinpoint Test A . |
| C1979 | IWE Solenoid Circuit Failure | 4X4 Control Module | Go to Pinpoint Test C . |
| C1980 | IWE Solenoid Short to Battery | 4X4 Control Module | Go to Pinpoint Test C . |
| P1812 | 4-Wheel Drive Mode Select Circuit Failure | 4X4 Control Module | Go to Pinpoint Test D . |
| P1815 | 4-Wheel Drive Mode Select Short Circuit to Ground | 4X4 Control Module | Go to Pinpoint Test D . |
| P1825 | 4-Wheel Drive Clutch Relay Open Circuit | 4X4 Control Module | Go to Pinpoint Test E . |
| P1826 | 4-Wheel Drive Low Clutch Relay Circuit to Battery | 4X4 Control Module | Go to Pinpoint Test E . |
| P1827 | 4-Wheel Drive Low Clutch Relay Circuit to Ground | 4X4 Control Module | Go to Pinpoint Test E . |
| P1886 | 4X4 Initialization Failure | 4X4 Control Module | CLEAR the DTC. REPEAT the self-test. If the DTC still reports, CONFIRM the 4X4 control module part number is correct for the vehicle. |
| U0100 | Lost Communication with ECM/PCM | 4X4 Control Module | REFER to MODULE COMMUNICATIONS NETWORK article to diagnose the lost communication with the PCM. |
| U0101 | Lost Communication with TCM | 4X4 Control Module | REFER to MODULE COMMUNICATIONS NETWORK
article to diagnose the lost communication with the Transmission Control Module (TCM). |
| U0121 | Lost Communication with Anti-Lock Brake System (ABS) Control Module | 4X4 Control Module | REFER to MODULE COMMUNICATIONS NETWORK article to diagnose the lost communication with the ABS module. |
| U2023 | Fault Received from External Node | 4X4 Control Module | REFER to VEHICLE DYNAMIC SYSTEMS article to diagnose the wheel speed sensor fault. |
| U2050 | No Application Present | 4X4 Control Module | Method 3 programming fault. REFER to MODULE CONFIGURATION article. |
RENDER: 1.0x
NO RELATED
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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.