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.
2005 Ford Expedition RWDFACTORY OEM SERVICE PROCEDURE
Navigation System DTCS
DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Audio Unit Display | Description | Source | Perform Test |
|---|---|---|---|---|
| B1342 | $9342 | 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 MODULE . CLEAR the DTCs. REPEAT the self-test. |
| B2139 | $A139 | 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 MODULE . CLEAR the DTCs. REPEAT the self-test. |
| B2204 | $A204 | GPS Antenna Connection Open or Short | Navigation System Module | GO to PINPOINT TEST B . |
| B2208 | $A208 | Navigation to Head Unit Communication Error | Navigation System Module | GO to PINPOINT TEST I . |
| B2633 | $A633 | Driver - Front Microphone Circuit Failure | Navigation System Module | GO to PINPOINT TEST J . |
| C1192 | $5992 | Vehicle Speed Circuit Failure | Navigation System Module | GO to PINPOINT TEST C . |
| U1016 | $D016 | SCP Invalid Data (PCM) | Navigation System Module | GO to PINPOINT TEST K . |
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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