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.
Navigation System Module Diagnostic Trouble Code (DTC) Index
| DTC | Description | Source | Action |
|---|---|---|---|
| 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 Ford 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 C: NAVIGATION SYSTEM DOES NOT OPERATE CORRECTLY - THE GLOBAL POSITIONING SYSTEM (GPS) ANTENNA SIGNAL IS INOPERATIVE . |
| B2208 | Navigation to Head Unit Communication Error | Navigation System Module | Go To PINPOINT TEST J: 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 COMMUNICATIONS NETWORK - LS . |
| B2633 | Driver - Front Microphone Circuit Failure | Navigation System Module | Go To PINPOINT TEST K: DTC B2633 DRIVER - FRONT MICROPHONE CIRCUIT FAILURE . |
| B2858 | Head Unit 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 Ford audio system repair facility. REFER to ENTERTAINMENT SYSTEM - LS .CLEAR the DTCs REPEAT the self-test |
| C1192 | Vehicle Speed Circuit Failure | Navigation System Module | Go To PINPOINT TEST D: NAVIGATION SYSTEM DOES NOT OPERATE CORRECTLY - THE POSITION CURSOR IS INOPERATIVE . |
| U1016 | SCP Invalid Data (PCM) | Navigation System Module | Go To PINPOINT TEST L: DTC U1016 - SCP INVALID DATA POWERTRAIN CONTROL MODULE . |
For a complete list of navigation system module DTCs, refer to MODULE COMMUNICATIONS NETWORK - LS .
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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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