Control Module U Code List
This list includes all Data Communications related U-code DTCs in alphanumeric order with descriptors for all modules. Not all DTCs listed will be applicable to all vehicles.
| DTC | DTC Descriptor |
|---|---|
| U0001 00 | High Speed CAN Bus Malfunction |
| U0002 00 | High Speed CAN Bus |
| U0020 00 | Low Speed CAN Bus |
| U0073 00 | Control Module Communication Bus A Off |
| U0073 71 | ECU HS Bus Off |
| U0073 72 | ECU LS Bus Off |
| U0074 00 | Control Module Communication Bus B Off |
| U0075 00 | Control Module Communication Bus "C" Off |
| U0100 00 | Lost Communication with Engine/Powertrain Control Module (ECM/PCM) |
| U0100 75 | Lost Communication with Engine/Powertrain Control Module (ECM) |
| U0100 7F | Lost Communication with Engine/Powertrain Control Module (ECM) |
| U0101 00 | Lost Communication with Transmission Control Module (TCM) |
| U0101 75 | Lost Communication with Transmission Control Module (TCM) |
| U0102 00 | Lost Communication with Transfer Case Control Module |
| U0104 00 | Lost Communication with Cruise Control Module |
| U0104 7F | Lost Communication with Cruise Control Module |
| U0106 00 | Lost Communication with Glow Plug Control Module |
| U0109 00 | Lost Communication with Fuel Pump Control Module |
| U010F 00 | Lost Communication with Air Conditioning Control Module |
| U0111 00 | Lost Communication with Battery Energy Control Module |
| U0117 00 | Lost Communication Electrical PTO Control Module |
| U0121 00 | Lost Communication with Electronic Brake Control Control Module (EBCM) |
| U0122 00 | Lost Communication with Vehicle Stability Control Module |
| U0123 00 | Lost Communication with Yaw Rate Sensor Module |
| U0128 00 | Lost Communication with Park Brake Control Module |
| U0129 00 | Lost Communication with Brake System Control Module |
| U0131 00 | Lost Communication with Power Steering Control Module |
| U0132 00 | Lost Communication with Ride Level Control Module |
| U0134 00 | Lost Communication with Power Steering Control Module - Rear |
| U0136 00 | Lost Communication with Differential Control Module - Rear |
| U0137 00 | Lost Communication with Trailer Brake Control Module |
| U0140 00 | Lost Communication with Body Control Module |
| U0141 00 | Lost Communication with Body Control Module A |
| U0144 00 | Lost Communication with Body Control Module "D" |
| U0146 00 | Lost Communication with Gateway A |
| U0151 00 | Lost Communication with Inflatable Restraint Sensing and Diagnostic Module (SDM) |
| U0151 71 | Lost Communication with Inflatable Restraint Sensing and Diagnostic Module (SDM) Invalid Serial Data Received |
| U0151 7F | Lost Communication with Restraints Control Inflatable Restraint Sensing and Diagnostic Module (SDM) Erratic |
| U0155 00 | Lost Communication with Instrument Panel Cluster (IPC) Control Module |
| U0156 00 | Lost Communication with Information Center A (DIC) |
| U0158 00 | Lost Communication with Head Up Display |
| U0159 00 | Lost Communication with Park Assist Module (RPA) |
| U0160 00 | Lost Communication with Audible Alert Control Module |
| U0164 00 | Lost Communication with HVAC Control Module |
| U0165 00 | Loss of Communication with HVAC Control Module - Rear |
| U0168 00 | Lost Communication with Vehicle Security Control Module |
| U0170 00 | Lost Communication with Restraints System Sensor A (PPS) |
| U0172 00 | Lost Communication with Rollover Sensor |
| U0173 00 | Lost Communication with "Restraints System Sensor D" |
| U0181 00 | Lost Communication with Headlamp Leveling Control Module |
| U0184 00 | Lost Communication with Radio |
| U0186 00 | Lost Communication with Audio Amplifier |
| U0191 00 | Lost Communication with Television |
| U0194 00 | Lost Communication with Digital Radio Receiver (DRR) |
| U0196 00 | Lost Communication with Rear Audio Control Module |
| U0198 00 | Lost Communication with Telematic Control Module |
| U0199 00 | Lost Communication with Door Control Module A (DDM) |
| U0200 00 | Lost Communication with Door Control Module B (PDM) |
| U0208 00 | Lost Communication with Seat Control Module A (DSM/MSM) |
| U0209 00 | Lost Communication with Seat Control Module B (HVSM) |
| U0210 00 | Lost Communication with Seat Control Module C (RHSM) |
| U0214 00 | Lost Communication with Remote Function Actuation |
| U0230 00 | Lost Communication with Rear Gate Module |
| U0232 00 | Lost Communication with Side Object Detection (SOD) Module - Left |
| U0233 00 | Lost Communication with Side Object Detection (SOD) Module - Right |
| U0236 00 | Lost Communication with Column Locking Module (CLM) |
| U023A 00 | Lost Communication with Vehicle Direction Camera Control Module (Lane Departure Warning) |
| U0241 00 | Lost Communication with Headlamp Control Module A |
| U0249 00 | Loss of Communication with Entertainment Control Module - Rear B |
| U0255 00 | Loss of Communication with Front Display Interface Module |
| U0256 00 | Loss of Communication with Front Controls Interface Module |
| U0257 00 | Loss of Communication with Front Controls/Display Interface Module |
| U0293 00 | Lost Communication with with HP2 Powertrain Control Module |
| U180F | Control Module Communication Bus B Off |
| U1000 | Class 2 Data Link Malfunction |
| U1016 | Lost Communication with ECM / PCM |
| U1017 | Lost Communication with Engine Control System |
| U1024 | Lost Communication with Transmission Control Module |
| U1026 | Lost Communication with Transfer Case Control Module |
| U1040 | Lost Communication with Electronic Brake Control Module |
| U1064 | Lost Communication with Body Control Module / Dash Integration Module |
| U1088 | Lost Communication with Inflatable Restraint Sensing and Diagnostic Module |
| U1096 | Lost Communication with Instrument Panel Cluster |
| U1098 | Lost Communication with Secondary Information Center |
| U1099 | Lost Communication with Head Up Display |
| U1100 | Lost Communication with "Driver Information and Displays Control System" |
| U1128 | Lost Communication with Radio |
| U1129 | Lost Communication with Amplifier |
| U1133 | Lost Communication with Mini Disc Changer |
| U1137 | Lost Communication with Satellite Digital Audio Reception System (DRR) |
| U1153 | Lost Communication with Climate Control Panel |
| U1164 | Lost Communication with Driver Door Switch |
| U1165 | Lost Communication with Passenger Door Switch |
| U1176 | Lost Communication with Remote Function Actuation |
| U1177 | Lost Communication with Folding Top Controller |
| U1193 | Lost Communication with Remote Control Door Lock Receiver |
| U1255 | Loss of Class 2 Communication |
| U1300 | Class 2 Data Link Low |
| U1301 | Class 2 Data Link high |
| U1305 | Class 2 Data Link high or Low |
| U1500 01 | Inter-Device Dedicated Bus 1 Short to Battery |
| U1500 02 | Inter-Device Dedicated Bus 1 Short to Ground |
| U1511 00 | Inter-device Dedicated Bus Lost Communication with Device 1 |
| U1512 00 | Inter-device Dedicated Bus Lost Communication with Device 2 |
| U1513 00 | LIN Bus 1 Lost Communication with Device 3 |
| U1650 00 | Chassis System Dedicated Bus Controller |
| U1651 00 | Chassis System Dedicated Bus Sensor |
| U180F 00 | Control Module Communication Bus B Off |
| U1802 00 | Lost Communication with Fuel Pump Control Module |
| U1812 00 | Battery Energy Control Module Bus B High Speed Communication Enable Circuit Low |
| U1813 00 | Battery Energy Control Module Bus B High Speed Communication Enable Circuit High |
| U1814 00 | Powertrain High Speed Communication Enable Circuit |
| U1815 00 | Lost Communication with Drive Motor Control Module A on Bus B |
| U1816 00 | Lost Communication with Drive Motor Control Module B on Bus B |
| U1817 00 | Lost Communication with Hybrid Powertrain Control Module on Bus B |
| U1818 00 | Lost Communication with ECM/PCM A on Bus B |
| U1820 00 | Lost Communication with Brake System Control Module on Bus B |
| U1821 00 | Lost Communication with DC to DC Converter Control Module A on Bus B |
| U1822 00 | Lost Communications with Active Front Steering (AFS) Control Module on Bus B |
| U1823 00 | Lost Communications with Antilock Brake System (ABS) Control Module on Bus B |
| U1824 00 | Lost Communications with Ride Level Control Module |
| U1825 00 | Lost Communications with SCM (CAN) |
| U1826 71 | Lost Communication with Multi-Axis Acceleration Sensor Module on Bus "B" Invalid Serial Data Received |
| U1826 72 | Lost Communication with Multi-Axis Acceleration Sensor Module on Bus "B" Alive Counter Incorrect/Not Updated |
| U1826 7F | Lost Communication with Multi-Axis Acceleration Sensor Module on Bus "B" Erratic |
| U1827 71 | Lost Communication with Steering Angle Sensor Module on Bus "B" Invalid Serial Data |
| U1827 72 | Lost Communication with Steering Angle Sensor Module on Bus "B" Alive Counter Incorrect/Not Updated |
| U1827 74 | Lost Communication with Steering Angle Sensor Module on Bus "B" Value of Signal Protection Calculation Incorrect |
| U1827 7F | Lost Communication with Steering Angle Sensor Module on Bus "B" Erratic |
| U182A 00 | Lost Communication with Battery Energy Control Module on Bus B |
| U1842 00 | Electronic Brake Control Module Lost Communication with Engine Control Module on Bus B |
| U1843 00 | Electronic Brake Control Module Lost Communication with Hybrid Engine Control Module on Bus B |
| U1862 00 | Battery Energy Control Module Lost Communication with Communications Gateway Module |
| U1863 00 | Starter/Generator Control Module Lost Communication with Body Control Module |
| U1865 00 | Fuel Operated Heater Lost Communication with Engine Control Module |
| U1866 00 | Battery Energy Control Module Lost Communication with Body Control Module |
| U186A 00 | Lost Communication with Transfer Case Control Module |
| U186B 00 | Lost Communication with TCM |
| U1875 00 | Drive Motor A Control Module Lost Communication with Battery Energy Control Module |
| U1876 00 | Drive Motor A Control Module Lost Communication with Engine Control Module (ECM)/Powertrain Control Module (PCM) |
| U1878 00 | Drive Motor B Control Module Lost Communication with Battery Energy Control Module |
| U1879 00 | Drive Motor B Control Module Lost Communication with Engine Control Module (ECM)/Powertrain Control Module (PCM) |
| U1885 00 | Battery Energy Control Module Lost Communication with with HP2 Powertrain Control Module |
| U1886 00 | Battery Energy Control Module Lost Communication with Engine Control Module (ECM) |
| U1888 00 | Lost Communication with Battery Pack |
| U1897 00 | Starter/Generator Control Module Lost Communication with Battery Energy Control Module |
| U1899 00 | Starter/Generator Control Module Lost Communication with Engine Control Module/Powertrain Control Module |
| U189A 00 | DC to DC Converter Control Module A Lost Communication with with HP2 Powertrain Control Module |
| U2099 00 | High Speed Communication Enable Circuit |
| U209A 00 | High Speed Communication Enable Circuit Low |
| U209D 00 | Battery Energy Control Module High Speed Communication Enable Circuit High |
| U2100 00 | Controller Area Network (CAN) Bus Communication |
| U2100 47 | Controller Area Network (CAN) Bus Communication |
| U2102 00 | Fewer Controllers On Bus Than Programmed |
| U2103 00 | Fewer Controllers On Bus Than Programmed |
| U2105 00 | Lost Communication with Engine Control Module |
| U2106 00 | Lost Communication with Transmission Control Module |
| U2107 00 | Lost Communication with Body Control Module |
| U2108 00 | Lost Communication with ABS/TCS Control System |
| U2109 00 | Lost Communication with Powertrain Control Module |
| U2110 00 | Lost Communication with Chassis Multiple Control System |
| U2111 00 | Lost Communication with Steering Control Module |
| U2112 00 | Lost Communication with Electronic Suspension Control (ESC) |
| U2113 00 | Lost Communication with Sensing and Diagnostic Module (SDM) |
| U2114 00 | Lost Communication with PPS or CPS |
| U2115 00 | Lost Communication with (Restraints Control System) |
| U2116 00 | Lost Communication with Instrument Cluster |
| U2117 00 | Lost Communication with Info Display |
| U2118 00 | Lost Communication with Head Up Display (HUD) |
| U2119 00 | Lost Communication with Daytime Running Lamps Control Module |
| U2120 00 | Lost Communication with Automatic Headlamp Leveling Control Module |
| U2121 00 | Lost Communication with Radio Display |
| U2122 00 | Lost Communication with Radio |
| U2123 00 | Lost Communication with Compact Disc Changer (CDX) |
| U2124 00 | Lost Communication with Audio Amplifier |
| U2125 00 | Lost Communication with Telematic Unit |
| U2126 00 | Lost Communication with Mobile Communications Control System |
| U2127 00 | Lost Communication with Front HVAC Control Module |
| U2128 00 | Lost Communication with Rear HVAC Control Module |
| U2129 00 | Lost Communication with Remote Function Actuator (RFA) |
| U2130 00 | Lost Communication with Driver Door Module (DDM) |
| U2131 00 | Lost Communication with Driver Seat Module (DSM) |
| U2132 00 | Lost Communication with Passenger Door Module (PDM) |
| U2133 00 | Lost Communication with Passenger Seat Module (PSM) |
| U2134 00 | Lost Communication with Rear Door Module (RDM) |
| U2135 00 | Lost Communication with Rear Integration Module (RIM) |
| U2136 00 | Lost Communication with Memory Mirror Module (MMM) |
| U2137 00 | Lost Communication with Vehicle Theft Deterrent (VTD) |
| U2138 00 | Lost Communication with Column Locking Module (CLM) |
| U2139 00 | Lost Communication with Column Integration Module (CIM) |
| U2140 00 | Lost Communication with Underhood Electrical Center (UEC) |
| U2141 00 | Lost Communication with Rear Electrical Center |
| U2142 00 | Lost Communication with Yaw Rate Sensor (YRS) |
| U2143 00 | Lost Communication with Steering Angle Sensor (SAS) |
| U2144 00 | Lost Communication with Distance Sensing Cruise Control Module |
| U2145 00 | Lost Communication with Parking Assistance System (PAS) |
| U2146 00 | Lost Communication with Shift Lever Module (SLM) |
| U2147 00 | Lost Communication with Auxiliary Heater System (AHS) |
| U2148 00 | Lost Communication with Sun Roof Module (SRM) |
| U2149 00 | Lost Communication with Tire Pressure Monitor (TPM) System |
| U2150 00 | Navigation Electronic Control Unit (ECU) Gateway Communications |
| U2151 00 | Navigation Electronic Control Unit (ECU) Communications |
| U2152 00 | Navigation Bus Request Line Circuit Low |
| U2153 00 | Navigation Electronic Control Unit (ECU) - VICS Communication Circuit |
| U2160 00 | Lost Communication with Steering Control System Sensor |
| U2161 00 | Lost Communication with Dash Integration Module (DIM) |
| U2162 00 | Lost Communication with Instrument Panel integration Module (IPM) |
| U2163 00 | Lost Communication with Left Rear Door Module (LRDM) |
| U2164 00 | Lost Communication with Right Rear Door Module (RRDM) |
| U2165 00 | Lost Communication with Driver Door Switch (DDS) |
| U2166 00 | Lost Communication with Driver Position Module (DPM) |
| U2167 00 | Lost Communication with Remote Control Door Lock Receiver (RCDLR) |
| U2168 00 | Lost Communication with Side Object Detection (SOD) Module - Left |
| U2169 00 | Lost Communication with Side Object Detection (SOD) Module - Right |
| U2170 00 | Lost Communication with Four Wheel Drive (4WD) Clutch |
| U2171 00 | Lost Communication with Rear Seat Entertainment (RSE) |
| U2172 00 | Lost Communication with Digital Radio Receiver (DRR) |
| U2173 00 | Lost Communication with Passive Entry and Passive Start System |
| U2174 00 | Lost Communication with Parking Heater System |
| U2175 00 | Lost Communication with Special Vehicle Module |
| U2176 00 | Lost Communication with Power Take Off (PTO) Control Module |
| U2177 00 | Lost Communication with Cruise Control Module |
| U2178 00 | Lost Communication with Trailer Interface Module |
| U2179 00 | Lost Communication with Television Module |
| U2180 00 | Lost Communication with Folding Top Control Module |
| U2181 00 | Lost Communication with Moveable Roof Module |