DTC Troubleshooting Index
WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. 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 following DTC troubleshooting indexes, then troubleshoot the DTC(s) in this order:
- Battery voltage DTCs
- Internal error DTCs
- Loss of communication DTCs (begin with the lowest number first; for example, if B1005 and B1016 are retrieved, troubleshoot B1005 first).
- Signal error DTCs
MICU
| DTC | Description | DTC Type |
|---|---|---|
| B1000 | Communication bus line error | Loss of communication |
| B1001 | MICU internal error (CPU error) | Internal error |
| B1002 | MICU internal error (EEPROM error) | Internal error |
| B1005 | MICU lost communication with relay control module (RM message) | Loss of communication |
| B1007 | MICU lost communication with combination switch control unit (HLSW message) | Loss of communication |
| B1011 | MICU lost communication with gauge control module (VSP/NE message) | Loss of communication |
| B1012 | MICU lost communication with rear MICU (RJU message) | Loss of communication |
| B1013 | MICU lost communication with driver's MPCS unit (ASLOCKSW message) | Loss of communication |
| B1015 | MICU lost communication with driver's MPCS unit (DRLOCKSW message) | Loss of communication |
| B1032 | MICU lost communication with SRS unit (CDS message) | Signal error |
| B1575 | Automatic lighting sensor circuit malfunction | Signal error |
Relay Control Module
| DTC | Description | DTC Type |
|---|---|---|
| B1050 | Communication circuit error (BUS-OFF) | Loss of communication |
| B1051 | Relay control module internal error (CPU error) | Internal error |
| B1052 | Relay control module internal error (EEPROM error) | Internal error |
| B1055 | Relay control module lost communication with MICU (MICU message) | Loss of communication |
| B1056 | Relay control module lost communication with MICU (ALARM message) | Loss of communication |
| B1057 | Relay control module lost communication with MICU (DOORSW message) | Loss of communication |
| B1060 | Relay control module lost communication with gauge control module (VSP/NE message) | Loss of communication |
| B1061 | Relay control module lost communication with gauge control module (A/T message) | Loss of communication |
| B1062 | Relay control module lost communication with combination switch control unit (HLSW message) | Loss of communication |
| B1063 | Relay control module lost communication with combination switch control unit (WIPSW message) | Loss of communication |
| B1065 | Relay control module lost communication with driver's MPCS unit (DRLOCKSW message) | Loss of communication |
| B1075 | Headlight switch back-up circuit malfunction | Signal error |
| B1076 | Windshield wiper switch back-up circuit malfunction | Signal error |
| B1077 | Windshield wiper motor (Park) signal error | Signal error |
| B1078 | Daytime running lights system error (Canada) | Loss of communication |
| B1079 | Daytime running lights system error (USA) | Loss of communication |
| B1080 | Power supply circuit (IG1 line) input error for relay control module and MICU | Signal error |
Gauge Control Module
| DTC | Description | DTC Type |
|---|---|---|
| B1150 | Communication circuit error (BUS-OFF) | Loss of communication |
| B1152 | Gauge control module internal error (EEPROM error) | Internal error |
| B1155 | Gauge control module lost communication with combination switch control unit (HLSW message) | Loss of communication |
| B1156 | Gauge control module lost communication with combination switch control unit (WIPSW message) | Loss of communication |
| B1157 | Gauge control module lost communication with MICU (MICU message) | Loss of communication |
| B1158 | Gauge control module lost communication with relay control module (RM message) | Loss of communication |
| B1159 | Gauge control module lost communication with MICU (DOORSW message) | Loss of communication |
| B1162 | Gauge control module lost communication with Power tailgate control unit (PTG message) | Loss of communication |
| B1168 | Gauge control module lost communication with PCM (ENG messages) | Loss of communication |
| B1169 | Gauge control module lost communication with PCM (A/T messages) | Loss of communication |
| B1170 | Gauge control module lost communication with VSA modulator-control unit (VSA message) | Loss of communication |
| B1171 | Gauge control module lost communication with adaptive cruise control unit (ACC message) | Loss of communication |
| B1173 | Gauge control module lost communication with TPMS control unit (TPMS message) | Loss of communication |
| B1175 | Fuel level sensor (fuel gauge sending unit) circuit open | Signal error |
| B1176 | Fuel level sensor (fuel gauge sending unit) circuit short | Signal error |
| B1178 | F-CAN communication line error | Loss of communication |
| B1180 | Gauge control module lost communication with MICU (AUTOLT message) | Loss of communication |
| B1182 | Gauge control module lost communication with driver's MPCS unit (DRLOCKSW message) | Loss of communication |
| B1187 | Gauge control module lost communication with SRS unit (SRS message) | Loss of communication |
| B1189 | Gauge control module lost communication with active damper system control unit (ADS message) | Loss of communication |
| B1192 | Gauge control module lost communication with the battery sensor (UART LINE) | Loss of communication |
| U128F | Gauge control module lost communication with BSI control unit (BSI message) | Loss of communication |
Climate Control Unit
| DTC | Description | DTC Type |
|---|---|---|
| B1200 | Communication circuit error (BUS-OFF) | Loss of communication |
| B1202 | Climate control unit internal error | Internal error |
| B1205 | Climate control unit lost communication with gauge control module (VSP/NE massage) | Loss of communication |
| B1206 | Climate control unit lost communication with gauge control (ECT message) | Loss of communication |
| B1207 | Climate control unit lost communication with gauge control module (ILLUMI message) | Loss of communication |
| B1213 | An open in the rear evaporator temperature sensor circuit | Signal error |
| B1214 | A short in the rear evaporator temperature sensor circuit | Signal error |
| B1215 | An open or short in the recirculation control motor circuit | Signal error |
| B1223 | A problem in the rear blower motor circuit | Signal error |
| B1225 | An open in the in-car temperature sensor circuit | Signal error |
| B1226 | A short in the in-car temperature sensor 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 front evaporator temperature sensor circuit | Signal error |
| B1232 | A short in the front evaporator temperature sensor circuit | Signal error |
| B1233 | An open in the driver's air mix control motor circuit | Signal error |
| B1234 | A short in the driver's air mix control motor circuit | Signal error |
| B1235 | A problem in the driver's air mix control linkage, door, or motor circuit | Signal error |
| B1236 | An open in the passenger's air mix control motor circuit | Signal error |
| B1237 | A short in the passenger's air mix control motor circuit | Signal error |
| B1238 | A problem in the passenger's air mix control linkage, door, or motor circuit | Signal error |
| B1239 | An open or short in the front mode control motor circuit | Signal error |
| B1240 | A problem in the front mode control linkage, doors, or motor circuit | Signal error |
| B1241 | A problem in the front blower motor circuit | Signal error |
Climate Control Unit
| DTC | Description | DTC Type |
|---|---|---|
| B1244 | An open in the rear air mix control motor circuit | Signal error |
| B1245 | A short in the rear air mix control motor circuit | Signal error |
| B1246 | A problem in the rear air mix control linkage, door, or motor circuit | Signal error |
| B2965 | Climate control unit lost communication with rear climate control panel | Loss of communication |
| B2967 | An open in the humidity sensor circuit | Signal error |
| B2968 | A short in the humidity sensor circuit | Signal error |
| B2969 | Climate control unit lost communication with combination switch control unit (WIPSW message) | Loss of communication |
| B2970 | Climate control unit lost communication with relay control module (RM message) | Loss of communication |
| B2979 | An open in the A/C pressure sensor circuit | Signal error |
| B2980 | A short in the A/C pressure sensor circuit | Signal error |
| B2983 | A problem in the recirculation control linkage, door, or motor circuit | Signal error |
| B2991 | Climate control unit lost communication with audio unit | Loss of communication |
Combination Switch Control Unit
| DTC | Description | DTC Type |
|---|---|---|
| B1250 | Communication circuit error (BUS-OFF) | Loss of communication |
| B1252 | Combination switch control unit internal error (EEPROM error) | Internal error |
| B1255 | Combination switch control unit lost communication with MICU (MICU Message) | Loss of communication |
| B1275 | Combination light switch OFF position circuit malfunction | Signal error |
| B1276 | Combination light switch parking light position circuit malfunction | Signal error |
| B1277 | Headlight switch AUTO position circuit malfunction | Signal error |
| B1278 | Headlight switch ON position circuit malfunction | Signal error |
| B1279 | Headlight switch DIMMER position circuit malfunction | Signal error |
| B1280 | Turn signal switch circuit malfunction | Signal error |
| B1281 | Windshield wiper switch MIST position circuit malfunction | Signal error |
| B1282 | Windshield wiper switch INT position circuit malfunction | Signal error |
| B1283 | Windshield wiper switch LOW position circuit malfunction | Signal error |
| B1284 | Windshield wiper switch HIGH position circuit malfunction | Signal error |
Power Tailgate Control Unit
| DTC | Description | DTC Type |
|---|---|---|
| B1350 | Communication circuit error (BUS-OFF) | Loss of communication |
| B1352 | Power tailgate control unit internal error (EEPROM error) | Internal error |
| B1355 | Power tailgate control unit lost communication with MICU (MICU message) | Loss of communication |
| B1356 | Power tailgate control unit lost communication with driver's MPCS unit (DRLOCKSW message) | Loss of communication |
| B1357 | Power tailgate control unit lost communication with gauge control module (VSP/NE message) | Loss of communication |
| B1358 | Power tailgate control unit lost communication with driver's MPCS unit (ASLOCKSW message) | Loss of communication |
| B1359 | Power tailgate control unit lost communication with gauge control module (A/T message) | Loss of communication |
| B1375 | Driver's door power tailgate switch circuit malfunction | Signal error |
| B1376 | Tailgate outer handle switch circuit malfunction | Signal error |
| B1377 | Inside tailgate switch circuit malfunction | Signal error |
| B1378 | Power tailgate right pinch sensor circuit malfunction | Signal error |
| B1379 | Power tailgate left pinch sensor circuit malfunction | Signal error |
| B1380 | Power tailgate closer unit neutral switch circuit malfunction | Signal error |
| B1381 | Power tailgate closer unit release switch circuit malfunction | Signal error |
| B1382 | Power tailgate closer unit full latch switch circuit malfunction | Signal error |
| B1383 | Power tailgate closer unit ratchet switch circuit malfunction | Signal error |
| B1384 | Power tailgate closer unit half latch switch circuit malfunction | Signal error |
| B1386 | Power tailgate sensor pulse A circuit malfunction | Signal error |
| B1387 | Power tailgate sensor pulse B circuit malfunction | Signal error |
| B1388 | Power tailgate motor circuit malfunction | Signal error |
| B1389 | Power tailgate motor clutch circuit malfunction | Signal error |
| B1390 | Power tailgate closer function error | Signal error |
HandsFreeLink Control Unit
| DTC | Description | DTC Type |
|---|---|---|
| B1775 | Microphone input/output shorted to power (with navigation) | Signal error |
| Microphone input/output shorted to power (without navigation) | Signal error | |
| B1776 | Microphone input/output shorted to ground or open (with navigation) | Signal error |
| Microphone input/output shorted to ground or open (without navigation) | Signal error | |
| B1779 | HandsFreeLink steering wheel switch failure (with navigation) | Signal error |
| HandsFreeLink steering wheel switch failure (without navigation) | Signal error | |
| B1780 | HandsFreeLink steering wheel switch line short (with navigation) | Signal error |
| HandsFreeLink steering wheel switch line short (without navigation) | Signal error | |
| B1792 | HandsFreeLink control module error | Internal error |
| U1280 | Communication bus line error (BUS-OFF) | Loss of communication |
Immobilizer-Keyless Control Unit
| DTC | Description | DTC Type |
|---|---|---|
| B1900 | Communication circuit error (BUS-OFF) | Loss of communication |
| B1901 | Immobilizer unit internal error (CPU error) | Internal error |
| B1902 | Immobilizer unit internal error (EEPROM error) | Internal error |
| B1905 | Immobilizer-keyless control unit lost communication with driver's MPCS unit (DRLOCKSW message) | Loss of communication |
| B1906 | Immobilizer-keyless control unit lost communication with gauge control module (A/T message) | Loss of communication |
Rear MICU
| DTC | Description | DTC Type |
|---|---|---|
| B1950 | Communication circuit error (BUS-OFF) | Loss of communication |
| B1955 | Rear MICU lost communication with MICU (MICU message) | Loss of communication |
| B1956 | Rear MICU lost communication with gauge control module (A/T message) | Loss of communication |
| B1957 | Rear MICU lost communication with combination switch control unit (HLSW message) | Loss of communication |
| B1958 | Rear MICU lost communication with combination switch control unit (WIPSW message) | Loss of communication |
| B1959 | Rear MICU lost communication with relay control module (RM message) | Loss of communication |
Power Seat Control Unit
| DTC | Description | DTC Type |
|---|---|---|
| B1800 | Communication circuit error (BUS-OFF) | Loss of communication |
| B1802 | Power seat control unit internal error (EEPROM error) | Internal error |
| B1805 | Power seat control unit lost communication with gauge control module (VSP/NE message) | Loss of communication |
| B1806 | Power seat control unit lost communication with MICU (MICU message) | Loss of communication |
| B1808 | Power seat control unit lost communication with gauge control module (A/T message) | Loss of communication |
| B1810 | Power seat control unit lost communication with MICU (MIRRORSW message) | Loss of communication |
| B1811 | Power seat control unit lost communication with MICU (DOORSW message) | Loss of communication |
| B1812 | Power seat control unit lost communication with driver's MPCS unit (MEMSW message) | Loss of communication |
| B1825 | Power seat slide motor pulse error | Signal error |
| B1826 | Power seat front up-down motor pulse error | Signal error |
| B1827 | Power seat rear up-down motor pulse error | Signal error |
| B1828 | Power seat recline motor pulse error | Signal error |
| B1829 | A/T P signal and VSS signal mismatch | Signal error |
| B1835 | Power tilt/telescopic switch signal input error | Signal error |
| B1836 | Power seat position sensor circuit short | Signal error |
| B1837 | Driving position memory recall timeout | Signal error |
| B1840 | Tilt motor pulse error | Signal error |
| B1841 | Telescopic motor pulse error | Signal error |
| B1842 | Power tilt/telescopic position sensor power supply circuit (SVCC line) short | Signal error |
| B1843 | Power seat control unit lost communication with power tilt/telescopic steering control unit (UART line) | 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 |
Driver's MPCS Unit
| DTC | Description | DTC Type |
|---|---|---|
| B2150 | Communication circuit error (BUS-OFF) | Loss of communication |
| B2152 | Driver's MPCS unit internal error (EEPROM error) | Internal error |
| B2155 | Driver's MPCS unit lost communication with MICU (MICU message) | Loss of communication |
| B2156 | Driver's MPCS unit lost communication with MICU (MIRRORSW message) | Loss of communication |
| B2157 | Driver's MPCS unit lost communication with gauge control module (ILLUMI message) | Loss of communication |
| B2160 | Driver's MPCS unit lost communication with gauge control module (VSP/NE message) | Loss of communication |
| B2161 | Driver's MPCS unit lost communication with MICU (DOORSW message) | Loss of communication |
| B2162 | Driver's MPCS unit lost communication with relay control module (RM message) | Loss of communication |
| B2175 | Driver's power window motor pulse A error | Signal error |
| B2176 | Driver's power window motor pulse B error | Signal error |
| B2177 | Front passenger's power window motor pulse A error | Signal error |
| B2178 | Front passenger's power window motor pulse B error | Signal error |
| B2179 | Driver's door key cylinder switch LOCK/UNLOCK signal error | Signal error |
| B2180 | Driver's door lock switch LOCK/UNLOCK signal error | Signal error |
| B2181 | Driver's door lock knob switch LOCK/UNLOCK signal error | Signal error |
| B2182 | Left power mirror horizontal sensor signal error | Signal error |
| B2183 | Left power mirror vertical sensor signal error | Signal error |
| B2184 | Right power mirror horizontal sensor signal error | Signal error |
| B2185 | Right power mirror vertical sensor signal error | Signal error |
| B2186 | Front passenger's door lock switch LOCK/UNLOCK signal error | Signal error |
| B2187 | UART communication error 1 (Driver's MPCS unit from DR door ECU) | Signal error |
| B2188 | UART communication error 2 (Driver's MPCS Unit from other node) | Signal error |
| B2189 | Driver's window position data error | Signal error |
| B2190 | Assistant's window position data error | Signal error |
| B2191 | Front passenger's MPCS unit internal error (EEPROM error) | Internal error |
AcuraLink Control Unit
| DTC | Description | DTC Type |
|---|---|---|
| B2240 | XM antenna line failure | Internal error |
| U0029 | F-CAN Communication bus line error (BUS-OFF) | Loss of communication |
| U0100 | F-CAN lost communication with PCM | Loss of communication |
| U0155 | F-CAN lost communication with Gauge Control Module | Loss of communication |
| U1280 | Communication bus line error (BUS-OFF) | Loss of communication |
| U128D | Lost communication with gauge control module | Loss of communication |
BSI Control Unit
| DTC | Description | DTC Type |
|---|---|---|
| B18A1 | BSI control unit internal circuit error | Internal error |
| B18A5 | Left BSI radar unit temperature high | Signal error |
| B18A6 | Right BSI radar unit temperature high | Signal error |
| B18A7 | Left BSI radar unit voltage input low | Signal error |
| B18A8 | Right BSI radar unit voltage input low | Signal error |
| B18A9 | Left BSI radar unit voltage input high | Signal error |
| B18AA | Right BSI radar unit voltage input high | Signal error |
| B18AF | Left BSI radar unit internal circuit error | Internal error |
| B18B1 | Right BSI radar unit internal circuit error | Internal error |
| B18B4 | Left BSI radar unit dirty | Signal error |
| B18B5 | Right BSI radar unit dirty | Signal error |
| B18B6 | Lost communication with left BSI radar unit | Signal error |
| B18B7 | Lost communication with right BSI radar unit | Signal error |
| B18B8 | Left BSI radar unit azimuth off alignment | Signal error |
| B18B9 | Right BSI radar unit azimuth off alignment | Signal error |
| B18BA | Left BSI radar unit version incorrect | Signal error |
| B18BB | Right BSI radar unit version incorrect | Signal error |
| B18BC | BSI radar units communication error | Signal error |
| B18BD | BSI control unit voltage input high | Signal error |
| B18BE | BSI control unit voltage input low | Signal error |
| B18C2 | Left BSI alert indicator output error | Signal error |
| B18CF | Right BSI alert indicator output error | Signal error |
| U0155 | Lost communication with the gauge control module | Loss of communication |
| U0423 | Invalid data received from PCM (vehicle speed data) | Signal error |
| U1280 | Communication bus line error (BUS-OFF) | Loss of communication |