DTC Troubleshooting Index
WARNING: This page is about a different car, the 2009 Acura MDX, 2008 Acura MDX, and 2007 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 DTC troubleshooting index, then troubleshoot the DTC(s) in this order:
- Battery voltage DTCs
- Internal error DTCs
- Loss of communication DTCs (beginning with the lowest number first; for example, if B1005 and B1016 are retrieved, troubleshoot B1005 first).
- Signal error DTCs
MICU
DTC TROUBLESHOOTING CHART
| DTC | Description | DTC Type |
|---|---|---|
| B1000 | Communication bus line error | Loss of communication |
| B1001 | MICU internal (CPU) error | Internal error |
| B1002 | MICU internal (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 the rear fuse/relay box (RJC 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 the SRS unit (CDS message) | Signal error |
| B1575 | Automatic lighting sensor circuit malfunction | Signal error |
Relay Control Module
RELAY CONTROL MODULE - DTC TROUBLESHOOTING CHART
| DTC | Description | DTC Type |
|---|---|---|
| B1050 | Communication bus line error | Loss of communication |
| B1051 | Relay control module internal (CPU) error | Internal error |
| B1052 | Relay control module internal (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 (As) auto switch circuit malfunction | 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
GAUGE CONTROL MODULE - DTC TROUBLESHOOTING CHART
| DTC | Description | DTC Type |
|---|---|---|
| B1150 | Communication bus line error | Loss of communication |
| B1152 | Gauge control module internal (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 |
| 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 |
| B1177 | Battery voltage abnormal | Battery voltage |
| 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 |
| B1188 | Gauge control module lost communication with the MICU (RM message) | Loss of communication |
| B1189 | Gauge control module lost communication with active damper system control unit (ADS message) | Loss of communication |
Climate Control Unit
CLIMATE CONTROL UNIT - DTC TROUBLESHOOTING CHART
| DTC | Description | DTC Type |
|---|---|---|
| B1200 | Communication bus line error | 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 module (ECT massage) | Loss of communication |
| B1207 | Climate control unit lost communication with gauge control module (ILLUMI massage) | Loss of communication |
| B1213 | An open in the rear evaporator temperature sensor circuit | Signal error |
| B1214 | An open in the rear evaporator temperature sensor circuit | Signal error |
| B1215 | An open 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 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 evaporator temperature sensor circuit | Signal error |
| B1232 | A short in the 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, motor 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, motor or motor circuit | Signal error |
| B1239 | An open or short in the mode control motor circuit | Signal error |
| B1240 | A problem in the mode control linkage, doors, motor, or motor circuit | Signal error |
| B1241 | A problem in the blower motor circuit | Signal error |
Climate Control Unit
CLIMATE CONTROL UNIT - DTC TROUBLESHOOTING CHART
| DTC | Description | DTC Type |
|---|---|---|
| B1244 | An open in the rear air mix control motor circuit | Signal error |
| B1245 | An short in the rear air mix control motor circuit | Signal error |
| B1246 | A problem in the rear air mix control linkage, door, motor, 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 gauge control module (WIPSW message) | Loss of communication |
| B2970 | Climate control unit lost communication with gauge 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 |
| B2981 | Climate control unit lost communication with navigation unit | Loss of communication |
| B2983 | A problem in the recirculation control linkage, door, motor, or motor circuit | Signal error |
| B2991 | Climate control unit lost communication with audio unit | Loss of communication |
Combination Switch Control Unit
COMBINATION SWITCH CONTROL UNIT - DTC TROUBLESHOOTING CHART
| DTC | Description | DTC Type |
|---|---|---|
| B1250 | Communication bus line error | Loss of communication |
| B1252 | Combination switch control unit internal (EEPROM) error | Internal error |
| B1255 | Combination switch control unit lost communication with MICU | Loss of communication |
| B1275 | Combination light switch OFF position circuit malfunction | Signal error |
| B1276 | Combination light switch parking (SMALL) 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
POWER TAILGATE CONTROL UNIT - DTC TROUBLESHOOTING CHART
| DTC | Description | DTC Type |
|---|---|---|
| B1350 | Communication bus line error | Loss of communication |
| B1352 | Power tailgate control unit internal (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 | Power 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 | Tailgate closer unit open switch circuit malfunction | Signal error |
| B1381 | Tailgate closer unit close switch circuit malfunction | Signal error |
| B1382 | Tailgate closer unit full latch switch circuit malfunction | Signal error. |
| B1383 | Tailgate closer unit ratchet switch circuit malfunction | Signal error |
| B1384 | 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 |
Hands Free Link Control Unit
HANDS FREE LINK CONTROL UNIT - DTC TROUBLESHOOTING CHART
| DTC | Description | DTC Type |
|---|---|---|
| B1750 | Communication bus line error | Loss of communication |
| B1775 | Microphone input/output short to power/open | Signal error |
| B1776 | Microphone input/output short to ground/open | Signal error |
| B1779 | HFL switch or HFL-voice control switch (HFL talk/ HFL back buttons) circuit open/short | Signal error |
| B1780 | HFL-voice control switch (HFL talk/HFL back buttons) circuit short | Signal error |
| B1785 | Incorrect configuration (VEHINFO Frame) | Signal error |
| B1786 | HandsFreeLink control unit lost communication with gauge control module (VEHINFO Frame) | Signal error |
| B1792 | HandsFreeLink control unit internal error | Internal error |
Immobilizer-Keyless Control Unit
IMMOBILIZER-KEYLESS CONTROL UNIT - DTC TROUBLESHOOTING CHART
| DTC | Description | DTC Type |
|---|---|---|
| B1900 | Communication bus line error | Loss of communication |
| B1905 | Immobilizer-keyless control unit lost communication with driver's MPCS unit (DRLOCKSW message) | Signal error |
| B1906 | Immobilizer-keyless control unit lost communication with gauge control module (A/T message) | Signal error |
Rear MICU
REAR MICU - DTC TROUBLESHOOTING CHART
| DTC | Description | DTC Type |
|---|---|---|
| B1950 | Communication bus line error | 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
POWER SEAT CONTROL UNIT - DTC TROUBLESHOOTING CHART
| DTC | Description | DTC Type |
|---|---|---|
| B1800 | Communication bus line error | Loss of communication |
| B1802 | Power seat control unit internal (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 | 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
DRIVER'S MPCS UNIT - DTC TROUBLESHOOTING CHART
| DTC | Description | DTC Type |
|---|---|---|
| B2150 | Communication bus line error | Loss of communication |
| B2152 | Driver's MPCS unit internal (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 window motor pulse A error | Signal error |
| B2176 | Driver's window motor pulse B error | Signal error |
| B2177 | Front passenger's window motor pulse A error | Signal error |
| B2178 | Front passenger's 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 | Communication line (UART line) communication error (Driver's MPCS unit from Driver's MPCS unit) | Signal error |
| B2188 | Communication line (UART line) circuit open | Signal error |
| B2189 | Driver's window position detect circuit error | Signal error |
| B2190 | Front passenger's window position detect circuit error | Signal error |
| B2191 | Front passenger's MPCS unit internal (EEPROM) error | Internal error |
AcuraLink Control Unit
AcuraLink Control Unit - DTC TROUBLESHOOTING CHART
| DTC | Description | DTC Type |
|---|---|---|
| B2200 | Communication bus line error | Loss of communication |
| B2202 | AcuraLink control unit EEPROM error | Loss of communication |
| B2204 | B-CAN communication line error | Loss of communication |
| B2205 | F-CAN communication line error | Loss of communication |
| B2207 | Navigation unit control unit lost communication with AcuraLink control unit | Loss of communication |
| B2208 | HandsFreeLink control unit lost communication with AcuraLink control unit | Loss of communication |
| B2209 | AcuraLink control unit internal error | Loss of communication |
| B2240 | XM antenna error | Signal error |