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.
2021 Honda Clarity Plug-In HybridFACTORY OEM SERVICE PROCEDURE
Telematics Control System DTCS
| DTC | Description | DTC Type |
|---|---|---|
| B1401 | Telematics Control Unit Internal Error (CPU Error) | Internal error |
| B1403 | EV Telematics System GPS Receiver Malfunction | Internal error |
| B1404 | Cell Phone Module Malfunction | Internal error |
| B1412 | TEL Antenna Disconnected | Signal error |
| B1413 | TEL Antenna Shorted to Ground | Signal error |
| B1414 | GPS Antenna Disconnected | Signal error |
| B1415 | GPS Antenna Shorted to Ground | Signal error |
| U1280 | Communication Bus Line Error (BUS OFF) | Loss of communication |
| U128D | Telematics Control Unit Lost Communication with Gauge Control Module | Loss of communication |
| U1299 | Telematics Control Unit Lost Communication with Climate Control Unit | Loss of communication |
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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