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.
DTC 1204: HDD High Temp (2016-18)
- Check the vehicle battery condition first .
- This navigation DTC sets when the internal temperature of the navigation ECU (HDD) rises above 158 F (70 C). The audio-navigation unit is designed to shut down to protect the navigation ECU. This could be caused by an inoperative audio-navigation unit cooling fan or if the dash temperature exceeds the maximum. Do the troubleshooting when the unit is within the allowable temperature range.
- Check that the cooling fan screen on the back of the audio-navigation unit is not blocked. Clean it if necessary.
- If the center display unit displays an error message when you turn on the navigation system, follow the instructions .
- Check any official Honda service website for more service information about the navigation system.
- Before you troubleshoot, make sure to follow the General Troubleshooting Information .
- Problem verification:
Check that the temperature is below 158 F (70 C) in the dash.
- 2. Clear the hard error codes .
- 3. Press the engine start/stop button to select the OFF mode.
- 4. Check for hard error codes .
Is DTC 1204 indicated?
YES
Replace the audio-navigation unit .
NO
Intermittent failure, the system is OK at this time. Check the audio-navigation unit cooling fan on the back of the audio-navigation unit.
NO RELATED
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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.