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 in this article. 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. REFER to NAVIGATION SYSTEM MODULE in this article. SEND it to an authorized repair facility. CLEAR the DTCs. REPEAT the self-test. |
| B2204 | GPS Antenna Connection Open or Short | Navigation System Module | GO to PINPOINT TEST B . |
| B2208 | Navigation to Head Unit Communication Error | Navigation System Module | GO to PINPOINT TEST I . |
| 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 . |
| 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. REFER to AUDIO UNIT . SEND it to an authorized repair facility. CLEAR the DTCs. REPEAT the self-test. |
| C1192 | Vehicle Speed Circuit Failure | Navigation System Module | GO to PINPOINT TEST C . |
| U1016 | SCP Invalid Data (PCM) | Navigation System Module | GO to PINPOINT TEST K . |
For a complete list of navigation system module DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES .
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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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