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.
2004 Lincoln Navigator RWDFACTORY OEM SERVICE PROCEDURE
Navigation System DTCS
NAVIGATION SYSTEM MODULE DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description | Source | Perform Test |
|---|---|---|---|
| B1342 | ECU is Defective | Navigation System Module | CLEAR the DTCs. REPEAT the self-test. If DTC B1342 is retrieved again, INSTALL a new navigation system module. REFER to NAVIGATION SYSTEM MODULE . CLEAR the DTCs. REPEAT the self-test. |
| B2139 | Data Mismatch | Navigation System Module | CLEAR the DTCs. REPEAT the self-test. If DTC B2139 is retrieved again, REMOVE the navigation system module and SEND it to an authorized audio system repair facility. REFER to NAVIGATION SYSTEM MODULE . CLEAR the DTCs. REPEAT the self-test. |
| B2204 | GPS Antenna Connection Open or Short | Navigation System Module | Go To PINPOINT TEST B: NAVIGATION SYSTEM DOES NOT OPERATE CORRECTLY - NO GLOBAL POSITIONING SYSTEM (GPS) ANTENNA SIGNAL . |
| B2208 | Navigation to Head Unit Communication Error | Navigation System Module | Go To PINPOINT TEST I: NAVIGATION SYSTEM DOES NOT OPERATE CORRECTLY - THE AUDIO UNIT IS INOPERATIVE . |
| B2477 | Module Configuration Failure | Navigation System Module | CHECK the navigation system module configuration. REFER to MODULE CONFIGURATION . |
| B2633 | Driver - Front Microphone Circuit Failure | Navigation System Module | Go To PINPOINT TEST J: DTC B2633 DRIVER - FRONT MICROPHONE CIRCUIT FAILURE . |
| B2858 | Satellite ECU is Defective | Navigation System Module | CLEAR the DTCs. REPEAT the self-test. If DTC B2858 is retrieved again, REMOVE the audio unit and SEND it to an authorized audio system repair facility. REFER to AUDIO UNIT . CLEAR the DTCs. REPEAT the self-test. |
| C1192 | Vehicle Speed Circuit Failure | Navigation System Module | Go To PINPOINT TEST C: NAVIGATION SYSTEM DOES NOT OPERATE CORRECTLY - THE POSITION CURSOR IS INOPERATIVE . |
| U1016 | SCP Invalid Data (PCM) | Navigation System Module | Go To PINPOINT TEST K: DTC U1016 - SCP INVALID DATA . |
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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