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.
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HOMESERVICE MANUALSLINCOLN2008NAVIGATOR RWDREPAIR AND DIAGNOSISQUICK LOOKUPSDTC INDEXMODULE COMMUNICATIONS NETWORK DTCS
2008 Lincoln Navigator RWD
Module Communications Network DTCS
2008 Lincoln Navigator RWDSECTION 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. |
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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.