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 Pilot EliteFACTORY OEM SERVICE PROCEDURE
Backup Control Unit
BACKUP CONTROL UNIT DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description | DTC type |
|---|---|---|
| B1926 | Backup control antenna open or short | Internal error |
| B1931 | Backup control unit no response | Signal error |
| U1280 | B-CAN communication bus line error (BUS-OFF) | Loss of communication |
| U128D - Refer to: DTC Troubleshooting: U128D (Keyless Access Backup Control Unit: 6-Speed A/T) (2016 2017 2018) or DTC Troubleshooting: U128D (Keyless Access Backup Control Unit) (2019 2020 2021) or DTC Troubleshooting: U128D (Keyless Access Backup Control Unit: 9-Speed A/T) (2016 2017 2018) . |
Backup control unit lost communication with gauge control module | 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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