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.
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HOMESERVICE MANUALSHONDA2020CIVIC SPORT, 4D HATCHBACK, STANDARD TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSDTC INDEXKEYLESS ACCESS CONTROL UNIT DTCSKEYLESS ACCESS CONTROL UNIT (BODY CONTROL MODULE)
2020 Honda Civic Sport, 4D Hatchback, Standard Trans
Keyless Access Control Unit (Body Control Module)
2020 Honda Civic Sport, 4D Hatchback, Standard TransSECTION Keyless Access Control Unit (Body Control Module)
| DTC | Description | DTC type |
|---|---|---|
| B1601 | Keyless access control unit (body control module) internal (CPU) error | Internal error |
| DTC | Description | DTC type |
|---|---|---|
| B1602 | Keyless access control unit (body control module) internal (EEPROM) error | Internal error |
| B1632 | MTR CONT signal error | Signal error |
| B1640 | RF unit not connected | Signal error |
| B1645 | Driver's door LF antenna circuit short | Signal error |
| B1646 | Driver's door LF antenna circuit open | Signal error |
| B1647 | Passenger's door LF antenna circuit Short | Signal error |
| B1648 | Passenger's door LF antenna circuit open | Signal error |
| B1657 | Rear bumper LF antenna circuit short | Signal error |
| B1658 | Rear bumper LF antenna circuit open | Signal error |
| B1659 | Front interior LF antenna circuit short | Signal error |
| B1660 | Front interior LF antenna circuit open | Signal error |
| B1663 | Rear interior LF antenna circuit short | Signal error |
| B1664 | Rear interior LF antenna circuit open | Signal error |
| B1667 | 2/4-door: Rear shelf LF antenna circuit short | Signal error |
| 5-door: Rear shelf LF antenna (middle interior LF antenna) circuit short | ||
| B1668 | 2/4-door: Rear shelf LF antenna circuit open | Signal error |
| 5-door: Rear shelf LF antenna (middle interior LF antenna) circuit open | ||
| U1280 | B-CAN communication bus line error (BUS-OFF) | Loss of communication |
| U1281 | Keyless access control unit (body control module) lost communication with MICU (body control module) | Loss of communication |
| U128D | Keyless access control unit (body control module) lost communication with gauge control module | Loss of communication |
RENDER: 1.0x
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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.