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
Acoustic Vehicle Alerting Control Unit DTCS
| DTC | Description | DTC type |
|---|---|---|
| B2890-13 | An open in the acoustic vehicle alerting speaker circuit | Signal error |
| U0029-00 | F-CAN communication line error | Loss of communication |
| U0100-00 | Acoustic vehicle alerting control unit lost communication with PCM | Loss of communication |
| U0101-00 | Acoustic vehicle alerting control unit lost communication with PCM/TCM | Loss of communication |
| U0122-00 | Acoustic vehicle alerting control unit lost communication with VSA modulator-control unit | Loss of communication |
| U0128-00 | Acoustic vehicle alerting control unit lost communication with Electric parking brake control unit | Loss of communication |
| U0129-00 | Acoustic vehicle alerting control unit lost communication with Electric servo brake control unit | Loss of communication |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.