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.
2006 Lincoln Navigator RWDFACTORY OEM SERVICE PROCEDURE
Module Communications Network DTCS
DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description | Source | Perform Test |
|---|---|---|---|
| U0073 | Control Module Communication Bus off | EATC | GO to PINPOINT TEST E . |
| U1900 | CAN Communication Bus Fault | Vehicle Security Module | GO to PINPOINT TEST C . |
| U1900 | CAN Communication Bus Fault | PCM | GO to PINPOINT TEST D . |
| U1900 | CAN Communication Bus Fault-Receive Error | Parking Aid Module | GO to PINPOINT TEST G . |
| U1900 | CAN Communication Bus Fault-Receive Error | DSM | GO to PINPOINT TEST F . |
| U1900 | CAN Communication Bus Fault-Receive Error | Instrument Cluster | If the 4X4 light is not flashing with the key in the ON position, GO to PINPOINT TEST I . If the 4X4 light is flashing with the key in the ON position, REFER to FOUR-WHEEL DRIVE (4WD) SYSTEMS . |
| U1900 | CAN Communication Bus Fault-Receive Error | Power Liftgate Module | GO to PINPOINT TEST J . |
| U1900 | CAN Communication Bus Fault-Receive Error | ABS Module | GO to PINPOINT TEST A . |
| U1900 | CAN Communication Bus Fault-Receive Error | Air Suspension Control Module | GO to PINPOINT TEST K . |
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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