Network Communication DTC Troubleshooting Index
WARNING: This page is about a different car, the 2022 Honda Accord, 2021 Honda Accord, 2020 Honda Accord, 2019 Honda Accord, and 2018 Honda Accord. 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
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 (body control module) |
Loss of communication |
| U128D |
Auto light control unit lost communication with gauge control module |
Loss of communication |
Body Control Module
| DTC |
Description |
DTC type |
| B1002 |
BCM (body control module) internal error (EEPROM error) |
Internal error |
| B1003 |
BCM (body control module) PROGRAM error |
Internal error |
| B1036 |
IG1 power supply circuit malfunction |
Signal error |
| B1038 |
IMMOBILIZER F-CAN authentication ID not received |
Signal error |
| B1039 |
IMMOBILIZER F-CAN authentication ID unmatch |
Signal error |
| B1040 |
BCM (body control module) lost communication with front wiper |
Loss of communication |
| B1041 |
Front wiper motor malfunction |
Signal error |
| B1042 |
Front wiper security line error |
Signal error |
| B1043 |
Front wiper unit internal error (EEPROM error) |
Internal error |
| B1077 |
Front wiper auto stop switch signal error |
Signal error |
| B1275 |
Headlight OFF position circuit malfunction |
Signal error |
| B1276 |
Headlight switch PARKING position circuit malfunction |
Signal error |
| B1277 |
Headlight AUTO position circuit malfunction |
Signal error |
| B1278 |
Headlight ON 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 |
| B2352 |
Rain light sensor unit internal error (EEPROM error) |
Internal error |
| B2375 |
Rain sensing malfunction |
Internal error |
| B2376 |
Light sensing malfunction |
Internal error |
| U0073 |
F-CAN communication bus line error (BUS-OFF) |
Loss of communication |
| U0100 |
BCM (body control module) lost communication with ECM/PCM |
Loss of communication |
| U0122 |
BCM (body control module) lost communication with VSA/ABS |
Loss of communication |
| U1280 |
B-CAN communication bus line error (BUS-OFF) |
Loss of communication |
| U128D |
BCM (body control module) lost communication with gauge control module |
Loss of communication |
| U1291 |
BCM (body control module) lost communication with relay control module |
Loss of communication |
Front Seat Heater Control Unit
| DTC |
Description |
DTC type |
| B1C55 |
Driver's heater thermistor circuit open |
Signal error |
| B1C56 |
Driver's heater thermistor circuit short |
Signal error |
| DTC |
Description |
DTC type |
| B1C57 |
Passenger's heater thermistor circuit open |
Signal error |
| B1C58 |
Passenger's heater thermistor circuit short |
Signal error |
| B1C60 |
Driver's heater current abnormal high |
Signal error |
| B1C61 |
Driver's heater current abnormal low |
Signal error |
| B1C62 |
Passenger's heater current abnormal high |
Signal error |
| B1C63 |
Passenger's heater current abnormal low |
Signal error |
| B1C68 |
Driver's heater not heating |
Signal error |
| B1C69 |
Passenger's heater not heating |
Signal error |
| B1C70 |
Driver's main heater switch failure |
Signal error |
| B1C71 |
Passenger's main heater switch failure |
Signal error |
| U1064 |
Seat heater control unit lost communication with climate control unit |
Loss of communication |
| U1280 |
Seat heater control unit communication bus line error (BUS-OFF) |
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 |
| B1192 |
Gauge control module lost communication with battery sensor ECU (LIN bus connected) |
Loss of communication |
| B1193 |
Gauge control module lost communication with steering switch (LIN bus connected) |
Loss of communication |
| U0029 |
F-CAN communication line error |
Loss of communication |
| U0100 |
Gauge control module lost communication with ENG/AT |
Loss of communication |
| U0101 |
Gauge control module lost communication with AT |
Loss of communication |
| U0104 |
Gauge control module lost communication with driving support system control unit |
Loss of communication |
| U0122 |
Gauge control module lost communication with VSA modulator-control unit |
Loss of communication |
| U0128 |
Gauge control module lost communication with EPB |
Loss of communication |
| U0131 |
Gauge control module lost communication with EPS unit |
Loss of communication |
| U0132 |
Gauge control module lost communication with adaptive damper control 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 (body control module) (MICU frame) |
Loss of communication |
| U1288 |
Gauge control module lost communication with PARKSR |
Loss of communication |
| U128F |
Gauge control module lost communication with BSI unit |
Loss of communication |
| U129C |
Gauge control module lost communication with multipurpose camera unit |
Loss of communication |
| U3000-49 |
ECU internal circuit malfunction |
Internal error |
| U3000-51 |
Reprogramming error |
Internal error |
Head Up Display
| DTC |
Description |
DTC type |
| B1194 |
HUD lost communication with gauge control module (UART connection) |
Loss of communication |
| U0029 |
F-CAN communication line error |
Loss of communication |
| U1280 |
B-CAN communication bus line error (BUS-OFF) |
Loss of communication |
| U3000-49 |
ECU internal circuit malfunction |
Internal error |
| U3000-51 |
Reprogramming error |
Internal error |
Keyless Access Backup Control Unit (Body Control Module)
| DTC |
Description |
DTC type |
| B1926 |
Backup control antenna open or short |
Internal error |
| DTC |
Description |
DTC type |
| U1280 |
B-CAN communication bus line error (BUS-OFF) |
Loss of communication |
| U128D |
Backup control unit (body control module) lost communication with gauge control module |
Loss of communication |
Keyless Access Control Unit (Body Control Module)
| DTC |
Description |
DTC type |
| B1601 |
Keyless access control unit (body control module) internal (CPU) error |
Internal error |
| B1602 |
Keyless access control unit (body control module) 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 |
| 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 |
Rear shelf LF antenna circuit short |
Signal error |
| B1668 |
Rear shelf LF antenna circuit open |
Signal error |
| U1280 |
Keyless access control unit (body control module) communication bus line error (BUS-OFF) |
Loss of communication |
| U128D |
Keyless access control unit (body control module) lost communication with gauge control module |
Loss of communication |
Keyless Access Power Control Unit (Body Control Module)
| DTC |
Description |
DTC type |
| B12C5 |
Engine start/stop switch failure |
Signal error |
| B12C6 |
Electric steering lock switch C/D monitor circuit failure |
Signal error |
| B12C7 |
Electric steering lock motor circuit failure |
Signal error |
| B12D0 |
Power control unit (body control module) IG1A circuit error |
Internal error |
| B12D1 |
Power control unit (body control module) IG1B circuit error |
Internal error |
| B12D2 |
Power control unit (body control module) IG2 circuit error |
Internal error |
| B12D3 |
Power control unit (body control module) IG latch circuit error |
Internal error |
| B12D4 |
Starter request output circuit malfunction |
Signal error |
| B12D5 |
Electric steering lock power output circuit malfunction |
Signal 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 (body control module) lost communication with electric steering lock |
Loss of communication |
| B12F3 |
Power control unit (body control module) lost communication with transmission control unit |
Loss of communication |
| U0073 |
F-CAN communication bus line error |
Loss of communication |
| U0100 |
Power control unit (body control module) lost communication with PCM |
Loss of communication |
| DTC |
Description |
DTC type |
| U0122 |
Power control unit (body control module) lost communication with ABS/VSA modulator-control unit |
Loss of communication |
| U1280 |
B-CAN communication bus line error (BUS-OFF) |
Loss of communication |
| U128D |
Power control unit (body control module) lost communication with gauge control module |
Loss of communication |
Multiplex Control Unit, Door (Power Window Master Switch)
| DTC |
Description |
DTC type |
| B1125 |
Driver's power window motor A pulse malfunction |
Signal error |
| B1126 |
Driver's power window motor B pulse malfunction |
Signal error |
| B1127 |
Driver's door lock key cylinder switch malfunction |
Signal error |
| B1128 |
Driver's door lock switch malfunction |
Signal error |
| B1129 |
Driver's door lock knob switch malfunction |
Signal error |
| B1130 |
Front Passenger's power window motor A-phase pulse signal input error |
Signal error |
| B1131 |
Front Passenger's power window motor B-phase pulse signal input error |
Signal error |
| B1140 |
Driver's power window position detect circuit malfunction |
Signal error |
| B1142 |
Power window master switch lost communication with front passenger's power window switch (UART line open) |
Loss of communication |
| B1145 |
Front passenger's window position detect circuit malfunction |
Signal error |
| U1280 |
Communication bus line error (BUS-OFF) |
Loss of communication |
| U1281 |
Power window master switch lost communication with MICU (body control module) |
Loss of communication |
| U128D |
Power window master switch lost communication with gauge control module |
Loss of communication |
| U1299 |
Power window master switch lost communication with climate control unit |
Loss of communication |
Parking and Back-Up Sensor Control Unit ('18-20)
| DTC |
Description |
DTC type |
| B2600-97 |
Dust or dirt on the sensor |
Internal error |
| B2625-96 |
Front left corner sensor failure |
Signal error |
| B2628-96 |
Front right corner sensor failure |
Signal error |
| B2629-96 |
Rear left corner sensor failure |
Signal error |
| B2630-96 |
Rear left center sensor failure |
Signal error |
| B2631-96 |
Rear right center sensor failure |
Signal error |
| B2632-96 |
Rear right corner sensor failure |
Signal error |
| B2635-11 |
Short to ground in the sensor main switch indicator line |
Signal error |
| B2635-12 |
Short to power in the sensor main switch indicator line |
Signal error |
| B2636-95 |
Abnormality in installed sensors condition |
Signal error |
| B2637-11 |
Short to ground in the sensor power supply line |
Signal error |
| B2638-87 |
Lost communication with the front left corner sensor |
Signal error |
| B2641-87 |
Lost communication with the front right corner sensor |
Signal error |
| B2642-87 |
Lost communication with the rear left corner sensor |
Signal error |
| B2643-87 |
Lost communication with the rear left center sensor |
Signal error |
| B2644-87 |
Lost communication with the rear right center sensor |
Signal error |
| B2645-87 |
Lost communication with the rear right corner sensor |
Signal error |
| U0029 |
F-CAN malfunction (BUS-OFF) |
Loss of communication |
| U0101 |
Lost communication with the PCM/TCM |
Loss of communication |
| U0122 |
Lost communication with the VSA modulator-control unit |
Loss of communication |
| U0155 |
Lost communication with gauge control module |
Loss of communication |
| U0402-68 |
PCM/TCM malfunction |
Loss of communication |
| U0416-F8 |
VSA modulator-control unit malfunction |
Loss of communication |
| DTC |
Description |
DTC type |
| U0423-4A |
Gauge control module malfunction |
Loss of communication |
| U3000-49 |
Parking and back-up sensor control unit internal electronic failure |
Internal error |
Parking and Back-Up Sensor Control Unit ('21)
| DTC |
Description |
DTC type |
| B2600-97 |
Dust or dirt on the sensor |
Internal error |
| B2625-96 |
Front left corner sensor failure |
Signal error |
| B2626-96 |
Front left center sensor failure |
Signal error |
| B2627-96 |
Front right center sensor failure |
Signal error |
| B2628-96 |
Front right corner sensor failure |
Signal error |
| B2629-96 |
Rear left corner sensor failure |
Signal error |
| B2630-96 |
Rear left center sensor failure |
Signal error |
| B2631-96 |
Rear right center sensor failure |
Signal error |
| B2632-96 |
Rear right corner sensor failure |
Signal error |
| B2635-11 |
Short to ground in the sensor main switch indicator line |
Signal error |
| B2635-12 |
Short to power in the sensor main switch indicator line |
Signal error |
| B2637-11 |
Short to ground in the sensor power supply line |
Signal error |
| B2637-12 |
Short to power in the sensor power supply line |
Signal error |
| B2638-87 |
Lost communication with the front left corner sensor |
Signal error |
| B2639-87 |
Lost communication with the front left center sensor |
Signal error |
| B2640-87 |
Lost communication with The front right center sensor |
Signal error |
| B2641-87 |
Lost communication with the front right corner sensor |
Signal error |
| B2642-87 |
Lost communication with the rear left corner sensor |
Signal error |
| B2643-87 |
Lost communication with the rear left center sensor |
Signal error |
| B2644-87 |
Lost communication with the rear right center sensor |
Signal error |
| B2645-87 |
Lost communication with the rear right corner sensor |
Signal error |
| C0023-F0 |
Brake Light Drive Relay Circuit Malfunction |
Signal error |
| C0051-96 |
Steering Angle Sensor Failure |
Signal error |
| U0029-00 |
F-CAN malfunction (BUS-OFF) |
Loss of communication |
| U0100-00 |
Lost Communication With The PCM/TCM |
Loss of communication |
| U0101-00 |
Lost communication with the PCM/TCM |
Loss of communication |
| U0122-00 |
Lost communication with the VSA modulator-control unit |
Loss of communication |
| U0129-00 |
Lost Communication With The Electric Servo Brake System/Electric Brake Booster System |
Loss of communication |
| U0131-00 |
Lost Communication With The ESP Control Unit |
Loss of communication |
| U0155-00 |
Lost communication with gauge control module |
Loss of communication |
| U0405-68 |
Driving Support System Control Unit Malfunction |
Loss of communication |
| U0416-68 |
VSA Modulator-Control Unit Malfunction |
Loss of communication |
| U0416-92 |
Invalid Data Received From VSA Modulator-Control Unit |
Receiving malfunction information |
| U0416-9A |
Invalid Data Received From VSA Modulator-Control Unit |
Receiving malfunction information |
| U0416-F8 |
VSA modulator-control unit malfunction |
Loss of communication |
| U0418-68 |
Electric Servo Brake System/Electric Brake Booster System Malfunction |
Loss of communication |
| U0418-92 |
Invalid Data Received From Brake System Control Unit |
Receiving malfunction information |
| U0423-68 |
Invalid Data Received From Gauge Control Module |
Receiving malfunction information |
| U3000-49 |
Parking and back-up sensor control unit internal electronic failure |
Internal error |
| DTC |
Description |
DTC type |
| U3000-51 |
Parking and Back-Up Sensor Control Unit Update Incomplete |
Internal error |
Power Seat Control Unit
| DTC |
Description |
DTC type |
| B1802 |
Power seat control unit internal (EEPROM) error |
Internal error |
| B1825 |
Slide pulse error (no change in pulse for 1 second) |
Signal error |
| B1826 |
Front height pulse error (no change in pulse for 1 second) |
Signal error |
| B1827 |
Rear height pulse error (no change in pulse for 1 second) |
Signal error |
| B1828 |
Driver seat recline motor pulse error |
Signal error |
| B1829 |
AT-P signal and VSP signal mismatch |
Signal error |
| B1836 |
Power seat position sensor circuit short |
Signal error |
| B1837 |
Memory position calling timeout |
Signal error |
| B1844 |
Power seat slide switch circuit malfunction |
Signal error |
| B1845 |
Power seat recline switch circuit malfunction |
Signal error |
| B1846 |
Power seat front up-down switch circuit malfunction |
Signal error |
| B1847 |
Power seat rear up-down switch circuit malfunction |
Signal error |
| U0199 |
Power seat control unit lost communication with door multiplex control unit (DRLockSW frame) |
Loss of communication |
| U1280 |
B-CAN communication bus line error (BUS-OFF) |
Loss of communication |
| U1281 |
Power seat control unit lost communication with MICU (body control module) (MICU frame) |
Loss of communication |
| U128D |
Lost communication with gauge control module (VSP/NE frame) |
Loss of communication |
Relay Control Module
| DTC |
Description |
DTC type |
| B1051 |
Relay control module internal (CPU) error |
Internal error |
| B1052 |
Relay control module internal (EEPROM) error |
Internal error |
| B1075 |
Headlight switch malfunction |
Signal error |
| B1080 |
Power supply circuit (IG1 line) input error for relay control module and MICU (body control module) |
Signal error |
| B1085 |
Headlight low beam power source abnormality |
Signal error |
| B108A |
Right side parking light circuit shorted |
Signal error |
| B108B |
Left side parking light circuit shorted |
Signal error |
| B108C |
Right side headlight low beam circuit shorted |
Signal error |
| B108D |
Left side headlight low beam circuit shorted |
Signal error |
| B108E |
Right side head light high beam circuit shorted |
Signal error |
| B108F |
Left side head light high beam circuit shorted |
Signal error |
| B1090 |
Illumination circuit shorted |
Signal error |
| B1091 |
DRL circuit shorted |
Signal error |
| B1092 |
Interior light cut circuit shorted |
Signal error |
| U1280 |
B-CAN communication bus line error (BUS-OFF) |
Loss of communication |
| U1281 |
Relay control module lost communication with MICU (body control module) (MICU frame) |
Loss of communication |
| U128D |
Relay control module lost communication with gauge control module (VSP/NE frame) |
Loss of communication |
Ventilated Seat Control Unit
| DTC |
Description |
DTC type |
| B1C55 |
Driver's heater thermistor circuit open |
Signal error |
| B1C56 |
Driver's heater thermistor circuit short |
Signal error |
| B1C57 |
Passenger's heater thermistor circuit open |
Signal error |
| DTC |
Description |
DTC type |
| B1C58 |
Passenger's heater thermistor circuit short |
Signal error |
| B1C60 |
Driver's heater current abnormal high |
Signal error |
| B1C61 |
Driver's heater current abnormal low |
Signal error |
| B1C62 |
Passenger's heater current abnormal high |
Signal error |
| B1C63 |
Passenger's heater current abnormal low |
Signal error |
| B1C68 |
Driver's heater not heating |
Signal error |
| B1C69 |
Passenger's heater not heating |
Signal error |
| B1C70 |
Driver's main heater switch failure |
Signal error |
| B1C71 |
Passenger's main heater switch failure |
Signal error |
| U1064 |
Seat heater control unit lost communication with climate control unit |
Loss of communication |
| U1280 |
Seat heater control unit communication bus line error (BUS-OFF) |
Loss of communication |
Wireless Charger
| DTC |
Description |
DTC type |
| B22A0 |
Wireless charger unit failure |
Internal error |
| B22A1 |
Wireless charger unit ACC input circuit failure |
Signal error |
| U1280 |
Communication bus line error (BUS-OFF) |
Loss of communication |
| U1281 |
Wireless charger unit lost communication with MICU (body control module) |
Loss of communication |
| U1286 |
Wireless charger unit lost communication with keyless access control unit (body control module) |
Loss of communication |
| U128D |
Wireless charger unit lost communication with gauge control module |
Loss of communication |
| U128E |
Wireless charger unit lost communication with audio-navigation unit |
Loss of communication |