Network Communication DTC Troubleshooting Index
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2020 Honda Fit, 2019 Honda Fit, 2018 Honda Fit, 2017 Honda Fit, and 2016 Honda Fit. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Record all DTCs, and sort them by DTC type using the DTC troubleshooting index, then troubleshoot the DTC (s) in this order:
- Internal error DTCs
- Loss of communication DTCs
- Signal error DTCs
MICU
| DTC | Description | DTC type |
|---|---|---|
| B1002 | MICU internal error (EEPROM error) | Internal error |
| B1003 | MICU update error | Internal error |
| B1028 | Rear wiper motor (Park) signal error | Signal error |
| B1036 | IG1 power supply circuit malfunction | Signal error |
| B1077 | Windshield wiper motor (Park) signal error | Signal error |
| B1127 | Driver's door key cylinder switch input circuit malfunction (Simultaneous input of lock and unlock signal) | Signal error |
| B1128 | Driver's door remote switch input circuit malfunction (Simultaneous input of lock and unlock signal) | Signal error |
| B1129 | Driver's door knob switch input circuit malfunction (Simultaneous input of lock and unlock signal) | Signal error |
| B1275 | Headlight OFF position circuit malfunction | Signal error |
| B1276 | Headlight switch parking (small) position circuit malfunction | Signal error |
| B1278 | Headlight ON position circuit malfunction | Signal error |
| B1277 | Head light AUTO position circuit malfunction | Signal error |
| B1279 | Dimmer switch circuit malfunction | Signal error |
| B1280 | Turn signal switch circuit malfunction | Signal error |
| B1281 | Front wiper MIST position circuit malfunction | Signal error |
| B1282 | Front wiper INT (AUTO) position circuit malfunction | Signal error |
| B1283 | Front wiper LOW position circuit malfunction | Signal error |
| B1284 | Front wiper HIGH position circuit malfunction | Signal error |
| U1280 | Communication bus line error (BUS-OFF) | Loss of communication |
| U128D | MICU lost communication with gauge control module | Loss of communication |
Gauge Control Module
| DTC | Description | DTC type |
|---|---|---|
| B1175 | Fuel level sensor (Fuel gauge sending unit) circuit malfunction | Signal error |
| B1176 | Fuel level sensor (Fuel gauge sending unit) circuit short | Signal error |
| U0029 | F-CAN communication line error | Loss of communication |
| U0100 | Gauge control module lost communication with ENG/AT | Loss of communication |
| U0121 | Gauge control module lost communication with ABS modulator-control unit | Loss of communication |
| U0122 | Gauge control module lost communication with VSA modulator-control unit | Loss of communication |
| U0131 | Gauge control module lost communication with EPS unit | Loss of communication |
| U0151 | Gauge control module lost communication with SRS unit | Loss of communication |
| U1280 | Communication bus line error (BUS-OFF) | Loss of communication |
| U1281 | Gauge control module lost communication with MICU (MICU frame) | Loss of communication |
| U3000-49 | ECU internal circuit malfunction | Internal error |
| U3000-51 | Reprogramming error | Internal error |
Climate Control
| DTC | Description | DTC type |
|---|---|---|
| B121A | An open in the mode control motor circuit | Signal error |
| B121B | A short in the mode control motor circuit | Signal error |
| B121D | Humidity/in-car temperature sensor communication error | Signal error |
| B121E | Electric capacity type switch IC communication error | Signal error |
| B1220 | A short in the recirculation control motor circuit | Signal error |
| B1227 | An open in the outside air temperature sensor circuit | Signal error |
| B1228 | A short in the outside air temperature sensor circuit | Signal error |
| B1229 | An open in the sunlight sensor circuit | Signal error |
| B1230 | A short in the sunlight sensor circuit | Signal error |
| B1231 | An open in the evaporator temperature sensor circuit | Signal error |
| B1232 | A short in the evaporator temperature sensor circuit | Signal error |
| B1233 | An open in the air mix control motor circuit | Signal error |
| B1234 | A short in the air mix control motor circuit | Signal error |
| B1235 | A problem in the air mix control motor circuit, linkage, door, or motor | Signal error |
| B1240 | A problem in the mode control motor circuit, linkage, door, or motor | Signal error |
| B1241 | A problem in the blower motor circuit | Signal error |
| B2983 | A problem in the recirculation control motor circuit, linkage, door, or motor | Signal error |
| B2986 | An open in the recirculation control motor circuit | Signal error |
| U1280 | Communication bus line error (BUS-OFF) | Loss of communication |
| U128D | Lost communication with gauge control module | Loss of communication |
Automatic Lighting Control Unit/Sensor
| DTC | Description | DTC type |
|---|---|---|
| B1575 | Auto light sensor error | Internal error |
| U1280 | BUS OFF state is detected by CAN controller | Loss of communication |
| U1281 | Auto light control unit lost communication with MICU | Loss of communication |
| U128D | Auto light control unit lost communication with gauge control module | Loss of communication |
Immobilizer-Keyless Control Unit
| DTC | Description | DTC type |
|---|---|---|
| U1280 | Communication bus line error (BUS-OFF) | Loss of communication |
| U1281 | Lost communication with MICU (MICU frame) | Loss of communication |
| U128D | Lost communication with METER | Loss of communication |
Keyless Access Control Unit
| DTC | Description | DTC type |
|---|---|---|
| B1601 | Keyless access control unit internal (CPU) error | Internal error |
| B1602 | Keyless access control unit internal (EEPROM) error | Internal error |
| B1632 | MTR CONT signal error | Signal error |
| B1640 | RF1 antenna not connected or malfunction | 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 |
| DTC | Description | DTC type |
|---|---|---|
| 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 |
| U1280 | Keyless access control unit communication bus line error (BUS-OFF) | Loss of communication |
| U1281 | Keyless access control unit lost communication with MICU | Loss of communication |
| U128D | Keyless access control unit lost communication with gauge control module | Loss of communication |
Keyless Access Backup Control Unit
| DTC | Description | DTC type |
|---|---|---|
| B1926 | Backup control antenna open or short | Internal error |
| B1931 | Backup control unit no response | Signal error |
| U1280 | Backup control unit communication bus line error (BUS-OFF) | Loss of communication |
| U128D | Backup control unit lost communication with gauge control module | Loss of communication |
Keyless Access Power Control Unit
| DTC | Description | DTC type |
|---|---|---|
| B12C5 | Engine start/stop switch failure | Internal error |
| B12C6 | Electric steering lock switch C/D monitor circuit failure | Internal error |
| B12C7 | Electric steering lock motor circuit failure | Internal error |
| B12D0 | Power control unit IG1A circuit error | Internal error |
| B12D1 | Power control unit IG1B circuit error | Internal error |
| B12D2 | Power control unit IG2 circuit error | Internal error |
| B12D3 | Power control unit IG latch circuit error | Internal error |
| B12E0 | Electric steering lock switch internal error | Internal error |
| B12E1 | Electric steering lock motor internal error | Internal error |
| B12E2 | Electric steering lock low level failure of MTRCUT1 | Signal error |
| B12E3 | Electric steering lock high level failure of MTRCUT1 | Signal error |
| B12E4 | Electric steering lock high level failure of MTRCUT2 | Signal error |
| B12E5 | Incorrect assembly of control unit for electric steering lock equipped vehicle | Signal error |
| B12F0 | Power control unit lost communication with electric steering lock | Loss of communication |
| U0073 | F-CAN communication bus line error | Loss of communication |
| U0100 | Power control unit lost communication with PCM | Loss of communication |
| U0122 | Power control unit lost communication with VSA modulator-control unit (VSA message) | Loss of communication |
| U1280 | Power control unit communication bus line error (BUS-OFF) | Loss of communication |
| U1281 | Power control unit lost communication with MICU | Loss of communication |
| U128D | Power control unit lost communication with gauge control module | Loss of communication |