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.
2008 Lincoln Navigator L 4WDFACTORY OEM SERVICE PROCEDURE
Module Communications Network DTCS
COMMUNICATION NETWORK DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description | Source | Perform Test |
|---|---|---|---|
| U0001 | High Speed CAN Communication Bus | ABS module | The module could not communicate on the network at a point in time. The fault is currently not present. CLEAR the DTC. REPEAT the network test with the scan tool. |
| U0073 | Control Module Communication Bus A Off | Vehicle dynamics module (VDM) | The module could not communicate on the network at a point in time. The fault is currently not present. CLEAR the DTC. REPEAT the network test with the scan tool. |
| U0073 | Control Module Communication Bus A Off | Transmission control module (TCM) | The module could not communicate on the network at a point in time. The fault is currently not present. CLEAR the DTC. REPEAT the network test with the scan tool. |
| U0100 | Lost Communication With ECM/PCM | ABS module | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test A . |
| U0100 | Lost Communication With ECM/PCM | VDM | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test A . |
| U0100 | Lost Communication With ECM/PCM | 4X4 control module | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test A . |
| U0100 | Lost Communication With ECM/PCM | Instrument cluster (IC) | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test A . |
| U0100 | Lost Communication With ECM/PCM | TCM | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test A . |
| U0101 | Lost Communication With TCM | ABS module | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test B . |
| U0101 | Lost Communication With TCM | IC | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test B . |
| U0101 | Lost Communication With TCM | 4X4 control module | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test B |
| U0102 | Lost Communication With Transfer Case Control Module (4x4CM) | IC | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test E . |
| U0102 | Lost Communication With Transfer Case Control Module (4x4CM) | TCM | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test E . |
| U0114 | Lost Communication With Four-Wheel Drive Clutch Control Module | ABS module | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test E . |
| U0121 | Lost Communication With ABS Control Module | IC | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test C . |
| U0121 | Lost Communication With ABS Control Module | TCM | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test C . |
| U0121 | Lost Communication With ABS Control Module | 4X4 control module | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test C . |
| U0122 | Lost Communication With Vehicle Dynamics Control Module | IC | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test F . |
| U0140 | Lost Communication With Body Control Module (GEM) | ABS module | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test H . |
| U0140 | Lost Communication With Body Control Module (GEM) | VDM | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test H . |
| U0140 | Lost Communication With Body Control Module (GEM) | Driver seat module (DSM) | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test H . |
| U0140 | Lost Communication With Body Control Module (GEM) | IC | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test H . |
| U0140 | Lost Communication With Body Control Module (GEM) | Parking aid module (PAM) | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test H . |
| U0140 | Lost Communication With Body Control Module (GEM) | Liftgate/trunk module (LTM) | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test H . |
| U0151 | Lost Communication With Restraints Control Module | IC | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test D . |
| U0155 | Lost Communication With Instrument Panel Cluster (IC) Control Module | ABS module | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test G . |
| U0155 | Lost Communication With Instrument Panel Cluster (IC) Control Module | VDM | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test G . |
| U0155 | Lost Communication With Instrument Panel Cluster (IC) Control Module | PAM | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test G . |
| U0155 | Lost Communication With Instrument Panel Cluster (IC) Control Module | LTM | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test G . |
| U0155 | Lost Communication With Instrument Panel Cluster (IC) Control Module | Smart junction box (SJB) | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test G . |
| U0159 | Lost Communication With Parking Assist Control Module (PAM) | ACM | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test S . |
| U0159 | Lost Communication With Parking Assist Control Module (PAM) | IC | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test S . |
| U0164 | Lost Communication With HVAC Control Module (EATC) | IC | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test I . |
| U0208 | Lost Communication With Seat Control Module | IC | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test P . |
| U0230 | Lost Communication With Rear Gate Module (LTM) | IC | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test T . |
| U0244 | Lost Communication With Running Board Control Module (PRB) | IC | CLEAR the DTC. REPEAT the network test with the scan tool. If the DTC returns, go to Pinpoint Test R . |
| U0401 | Invalid Data Received from ECM/PCM A | ABS module | RETRIEVE and FOLLOW the DTCs from the PCM. |
| U0402 | Invalid Data Received from TCM | ABS module | RETRIEVE and FOLLOW the DTCs from the TCM. |
| U0415 | Invalid Data Received from ABS Control Module | 4X4 control module | RETRIEVE and FOLLOW the DTCs from the ABS module. |
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.