Control Module U Code List
| 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 |
| U0001 04 | High Speed CAN Bus Malfunction Open |
| U0002 00 | High Speed CAN Bus |
| U0020 00 | Low Speed CAN Bus |
| U0073 00 | Control Module Communication Bus A Off |
| U0073 01 | Control Module Communication Bus A Off Short to Battery |
| U0073 02 | Control Module Communication Bus A Off Short to Ground |
| U0073 04 | Control Module Communication Bus A Off Open |
| U0073 71 | Control Module Communication Bus A Off Invalid Data |
| U0074 00 | Control Module Communication Bus B Off |
| U0077 00 | Control Module Chassis Expansion Communication Bus Off |
| U0078 00 | Control Module Low Speed Communication Bus Off |
| U007A 00 | Control Module High Voltage Energy Management Communication Bus Off |
| U0100 00 | Lost Communication With Engine Control Module |
| U0100 71 | Lost Communication With Engine Control Module Invalid Data |
| U0100 72 | Lost Communication With Engine Control Module Message Counter Incorrect |
| U0100 74 | Lost Communication With Engine Control Module Bus Signal Checksum Error |
| U0101 00 | Lost Communication With Transmission Control Module |
| U0101 71 | Lost Communication With Transmission Control Module Invalid Data |
| U0102 00 | Lost Communication with Transfer Case Control Module |
| U0102 71 | Lost Communication with Transfer Case Control Module Invalid Data |
| U0104 00 | Lost Communication With Cruise Control Module |
| U0104 02 | Lost Communication With Cruise Control Module Short to Ground |
| U0104 71 | Lost Communication With Cruise Control Module Invalid Data |
| U0104 72 | Lost Communication With Cruise Control Module Message Counter Incorrect |
| U0104 74 | Lost Communication With Cruise Control Module Bus Signal Checksum Error |
| U0105 00 | Lost Communication with Fuel Injector 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 |
| U0112 00 | Lost Communication with Battery Energy Control Module |
| U0115 00 | Lost Communication with ECM 2 |
| U0117 00 | Lost Communication With Power Take-Off Control Module |
| U0121 00 | Lost Communication With Electronic Brake Control Module |
| U0121 03 | Lost Communication With Electronic Brake Control Module Low Voltage |
| U0121 71 | Lost Communication With Electronic Brake Control Module Invalid Data |
| U0121 72 | Lost Communication With Electronic Brake Control Module Message Counter Incorrect |
| U0121 74 | Lost Communication With Electronic Brake Control Module Bus Signal Checksum Error |
| U0122 00 | Lost Communication With Vehicle Stability Control Module |
| U0125 00 | Lost Communication With Multi-axis Acceleration Sensor Module |
| U0125 71 | Lost Communication With Multi-axis Acceleration Sensor Module Invalid Data |
| U0125 72 | Lost Communication With Multi-axis Acceleration Sensor Module Message Counter Incorrect |
| U0125 74 | Lost Communication With Multi-axis Acceleration Sensor Module Bus Signal Checksum Error |
| U0126 00 | Lost Communication With Steering Wheel Angle Sensor Module |
| U0126 71 | Lost Communication With Steering Wheel Angle Sensor Module Invalid Data |
| U0126 72 | Lost Communication With Steering Wheel Angle Sensor Module Message Counter Incorrect |
| U0126 74 | Lost Communication With Steering Wheel Angle Sensor Module Bus Signal Checksum Error |
| U0126 5A | Lost Communication With Steering Wheel Angle Sensor Module Not Plausible |
| U0128 00 | Lost Communication With Park Brake Control Module |
| U0128 71 | Lost Communication With Park Brake Control Module Invalid Data |
| U0128 72 | Lost Communication With Park Brake Control Module Message Counter Incorrect |
| U0128 74 | Lost Communication With Park Brake Control Module Bus Signal Checksum Error |
| U0129 00 | Lost Communication with Brake System Control Module |
| U0130 00 | Lost Communication With Electric Power Steering Control Module |
| U0130 71 | Lost Communication With Electric Power Steering Control Module Invalid Data |
| U0130 72 | Lost Communication With Electric Power Steering Control Module Message Counter Incorrect |
| U0130 74 | Lost Communication With Electric Power Steering Control Module Bus Signal Checksum Error |
| U0131 00 | Lost Communication With Power Steering Control Module |
| U0131 71 | Lost Communication With Power Steering Control Module Invalid Data |
| U0132 00 | Lost Communication With Suspension Control Module |
| U0133 00 | Lost Communication With Air Suspension Control Module |
| U0133 71 | Lost Communication With Air Suspension Control Module Invalid Data |
| U0136 00 | Lost Communication With Differential Control Module - Rear |
| U0136 71 | Lost Communication With Differential Control Module - Rear Invalid Data |
| U0139 00 | Lost Communication With Suspension Control Module |
| U0139 71 | Lost Communication With Suspension Control Module Invalid Data |
| U0140 00 | Lost Communication With Body Control Module |
| U0140 08 | Lost Communication With Body Control Module Performance - Signal Invalid |
| U0140 71 | Lost Communication With Body Control Module Invalid Data |
| U0140 72 | Lost Communication With Body Control Module Message Counter Incorrect |
| U0140 74 | Lost Communication With Body Control Module Bus Signal Checksum Error |
| U0146 00 | Lost Communication with Gateway |
| U0151 00 | Lost Communication With Inflatable Restraint Sensing and Diagnostic Module |
| U0155 00 | Lost Communication With Instrument Cluster |
| U0158 00 | Lost Communication With Head-Up Display |
| U0159 00 | Lost Communication With Parking Assist Control Module |
| U0160 00 | Lost Communication With Chime Alarm Control Module |
| U0164 00 | Lost Communication with HVAC Control Module |
| U0166 00 | Lost Communication with Auxiliary Heater Control Module |
| U0167 00 | Lost Communication with Immobilizer Control Module |
| U0168 00 | Lost Communication With Keyless Entry Control Module |
| U016B 00 | Lost Communication with Electric A/C Compressor Control Module |
| U0170 00 | Lost Communication With Passenger Presence Detection Sensor Module |
| U0181 00 | Lost Communication With Headlamp Leveling Control Module |
| U0182 00 | Lost Communication With Lighting Control Module - Front |
| U0184 00 | Lost Communication With Radio |
| U0186 00 | Lost Communication With Speaker Amplifier Module |
| U0196 00 | Lost Communication With Rear Audio Control Module |
| U0191 00 | Lost Communication With Television |
| U0193 00 | Lost Communication With Digital Radio Receiver Control Module |
| U0197 00 | Lost Communication With Telephone Control Module |
| U0198 00 | Lost Communication With Telematic Control Module |
| U0201 00 | Lost Communication With Transfer Case Control Module |
| U0203 00 | Lost Communication With Left Rear Door Switch Panel Control Module |
| U0204 00 | Lost Communication With Right Rear Door Switch Panel Control Module |
| U0207 00 | Lost Communication With Moveable Roof Control Module |
| U0208 00 | Lost Communication With Memory Seat Control Module |
| U0209 00 | Lost Communication With Front Seat Heating Control Module |
| U0210 00 | Lost Communication With Rear Seat Heating Control Module |
| U0230 00 | Lost Communication With Liftgate Control Module |
| U0232 00 | Lost Communication With Side-Object Detection Control Module - Left |
| U0233 00 | Lost Communication With Side-Object Detection Control Module - Right |
| U0236 00 | Lost Communication With Steering Column Lock Module |
| U0237 00 | Lost Communication With Multimedia Player Interface Module |
| U023A 00 | Lost Communication With Vehicle Direction Camera Control Module |
| U0249 00 | Lost Communication With Rear Radio Audio Control Module |
| U0252 00 | Lost Communication With Trailer Interface Control Module |
| U0254 00 | Lost Communication With Remote Start Module |
| U0255 00 | Lost Communication With Info Display Module |
| U0256 00 | Lost Communication With Infotainment Faceplate Control Module |
| U0257 00 | Lost Communication With Info Display Module/Infotainment Faceplate Control Module |
| U0264 00 | Lost Communication With Camera Module - Rear |
| U0284 00 | Lost Communication with Active Grille Air Shutter Module 1 |
| U0285 00 | Lost Communication with Active Grille Air Shutter Module 2 |
| U0293 00 | Lost Communication with Hybrid Powertrain Control Module |
| U0301 00 | Software Incompatibility with Engine Control Module |
| U0302 00 | Software Incompatibility with Transmission Control Module |
| U0315 00 | Software Incompatibility with Electronic Brake Control Module |
| U0401 00 | Invalid Data Received from ECM |
| U0401 72 | Invalid Data Received from ECM Message Counter Incorrect |
| U0401 74 | Invalid Data Received from ECM Bus Signal Checksum Error |
| U0402 72 | Invalid Data Received From Transmission Control Module Message Counter Incorrect |
| U0402 73 | Invalid Data Received From Transmission Control Module Parity Error |
| U0402 74 | Invalid Data Received From Transmission Control Module Bus Signal Checksum Error |
| U0405 00 | Invalid Data Received From Cruise Control Module |
| U0405 71 | Invalid Data Received From Cruise Control Module Invalid Data |
| U0405 72 | Invalid Data Received From Cruise Control Module Message Counter Incorrect |
| U0405 74 | Invalid Data Received From Cruise Control Module Bus Signal Checksum Error |
| U0415 00 | Invalid Data Received From Electronic Brake Control Module |
| U0415 72 | Invalid Data Received From Electronic Brake Control Module Message Counter Incorrect |
| U0415 74 | Invalid Data Received From Electronic Brake Control Module Bus Signal Checksum Error |
| U0416 00 | Invalid Data Received From Vehicle Dynamics Control Module |
| U0416 72 | Invalid Data Received From Vehicle Dynamics Control Module Message Counter Incorrect |
| U0416 74 | Invalid Data Received From Vehicle Dynamics Control Module Bus Signal Checksum Error |
| U0418 00 | Invalid Data Received From Brake System Control Module |
| U0418 71 | Invalid Data Received From Brake System Control Module Invalid Data |
| U0418 72 | Invalid Data Received From Brake System Control Module Message Counter Incorrect |
| U0418 74 | Invalid Data Received From Brake System Control Module Bus Signal Checksum Error |
| U0422 00 | Invalid Data Received From Body Control Module |
| U0422 70 | Invalid Data Received From Body Control Module |
| U0422 72 | Invalid Data Received From Body Control Module Message Counter Incorrect |
| U0422 74 | Invalid Data Received From Body Control Module Bus Signal Checksum Error |
| U0424 00 | Invalid Data Received From HVAC Control Module |
| U0432 00 | Invalid Data Received From Multi-axis Acceleration Sensor Module |
| U0432 72 | Invalid Data Received From Multi-axis Acceleration Sensor Module Message Counter Incorrect |
| U0432 74 | Invalid Data Received From Multi-axis Acceleration Sensor Module Bus Signal Checksum Error |
| U0438 71 | Invalid Data Received From Trailer Brake Control Module |
| U0465 00 | Invalid Data Received From Power Take-Off Control Module |
| U1501 00 | LIN Bus 1 |
| U1502 00 | LIN Bus 2 |
| U1510 00 | (K9 Body Control Module) LIN Bus 1 Lost Communication With Device 0 (B165 Intrusion Sensor Module) |
| (K33 HVAC Control Module) LIN Bus 1 Lost Communication With Device 0 (A26 HVAC Control) | |
| (A11 Radio) LIN Bus 1 Lost Communication with Device 0 (A20 Radio/HVAC Control) | |
| U1511 00 | (K26 Headlamp Control Module) LIN Bus 1 Lost Communication With Device 1 (E13L Headlamp Assembly-Left) |
| U1512 00 | (K26 Headlamp Control Module) LIN Bus 1 Lost Communication With Device 2 (E13R Headlamp Assembly-Right) |
| U1513 00 | (K26 Headlamp Control Module) LIN Bus 1 Lost Communication With Device 3 (E13L Headlamp Assembly-Left) |
| U1514 00 | (K26 Headlamp Control Module) LIN Bus 1 Lost Communication With Device 4 (E13R Headlamp Assembly-Right) |
| U1515 00 | (K9 Body Control Module) LIN Bus 1 Lost Communication With Device 5 (M75 Windshield Wiper Motor) |
| U1516 00 | (K9 Body Control Module) LIN Bus 1 Lost Communication With Device 6 (B110 Battery Sensor Module) |
| U1517 00 | (K9 Body Control Module) LIN Bus 1 Lost Communication With Device 7 (Sunroof Sunshade Module) |
| U1519 00 | (K40 Seat Memory Control Module) LIN Bus 1 Lost Communication With Device 9 (S52 Outside Rearview Mirror Switch) |
| (K40 Seat Memory Control Module) LIN Bus 1 Lost Communication With Device 9 (K96 Mirror Control Module) | |
| U151A 00 | (K9 Body Control Module) LIN Bus 1 Lost Communication With Device 10 (B117 Windshield Outside Moisture Sensor) |
| U151B 00 | (K9 Body Control Module) LIN Bus 1 Lost Communication With Device 11 (K61 Sunroof Control Module) |
| (K40 Seat Memory Control Module) LIN Bus 1 Lost Communication With Device 11 (S79P Window Switch - Passenger) | |
| U1520 00 | (K9 Body Control Module) LIN Bus 2 Lost Communication With Device 0 (P25 Power Sounder Content Theft Deterrent Alarm Module) |
| U1521 00 | (K26 Headlamp Control Module) LIN Bus 2 Lost Communication With Device 1 (E13L Headlamp Assembly-Left) |
| U1522 00 | (K9 Body Control Module) LIN Bus 2 Lost Communication With Device 2 (K65 Tire Pressure Indicator Module) |
| (K26 Headlamp Control Module) LIN Bus 2 Lost Communication With Device 2 (E13R Headlamp Assembly-Right) | |
| U1523 00 | (K26 Headlamp Control Module) LIN Bus 2 Lost Communication With Device 3 (E13L Headlamp Assembly-Left) |
| U1524 00 | (K9 Body Control Module) LIN Bus 2 Lost Communication With Device 4 (Front Seat Heating Control Module) |
| (K26 Headlamp Control Module) LIN Bus 2 Lost Communication With Device 4 (E13R Headlamp Assembly-Right) | |
| U1526 00 | (K9 Body Control Module) LIN Bus 2 Lost Communication With Device 6 (Rear Seat Heating Control Module) |
| U152C 00 | (K9 Body Control Module) LIN Bus 2 Lost Communication With Device 12 (K18 Electronic Compass Module) |
| U152D 00 | (K9 Body Control Module) LIN Bus 2 Lost Communication With Device 13 (S3 Automatic Gearbox Change Lever) |
| U1530 00 | (K9 Body Control Module) LIN Bus 3 Lost Communication With Device 0 (M74P Window Motor - Passenger) |
| U1534 00 | (K9 Body Control Module) LIN Bus 3 Lost Communication With Device 4 (M74D Window Motor - Driver) |
| U1538 00 | (K9 Body Control Module) LIN Bus 3 Lost Communication With Device 8 (S79D Window Switch - Driver) |
| U153A 00 | (K9 Body Control Module) LIN Bus 3 Lost Communication With Device 10 (S79P Window Switch - Passenger) |
| U1540 00 | (K9 Body Control Module) LIN Bus 4 Lost Communication With Device 0 (M74RR Window Motor - Right Rear) |
| U1544 00 | (K9 Body Control Module) LIN Bus 4 Lost Communication With Device 4 (M74LR Window Motor - Left Rear) |
| U1548 00 | (K9 Body Control Module) LIN Bus 4 Lost Communication With Device 8 (S79LR Window Switch - Right Rear) |
| U154A 00 | (K9 Body Control Module) LIN Bus 4 Lost Communication With Device 10 (S79RR Window Switch - Left Rear) |
| U154B 00 | (K9 Body Control Module) LIN Bus 4 Lost Communication With Device 11 (K49 Rear Seat Control Module) |
| U1793 00 | 14V Power Module Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion Communication Bus |
| U1795 00 | 14V Power Module Powertrain Expansion Communication Bus Off |
| U179A 00 | Lost Communication with Hybrid Powertrain Control Module 2 |
| U1803 00 | Lost Communication with Hybrid Powertrain Control Module 2 |
| U1806 00 | Battery Energy Control Module High Voltage Energy Management Communication Bus Off |
| U1807 00 | Battery Charger Control Module High Voltage Energy Management Communication Bus Off |
| U180A 00 | Electric A/C Compressor Control Module High Speed Communication Bus Off |
| U180B 00 | Battery Energy Control Module High Speed Communication Bus Off |
| U180C 00 | Battery Charger Control Module High Speed Communication Bus Off |
| U180D 00 | Electronic Brake Control Module Chassis Expansion Communication Bus Off |
| U1811 00 | Battery Energy Control Module Powertrain Expansion CAN Bus Off |
| U1814 01 | Powertrain Wake Up Communication Circuit Short to Battery |
| U1814 02 | Powertrain Wake Up Communication Circuit Short to Ground |
| U1814 04 | Powertrain Wake Up Communication Circuit Open |
| U1815 00 | Lost Communication with Drive Motor Control Module A on Powertrain Expansion Communication Bus |
| U1816 00 | Lost Communication with Drive Motor Control Module B on Powertrain Expansion Communication Bus |
| U1817 00 | Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion Communication Bus |
| U1818 00 | Lost Communication with Engine Control Module on Powertrain Expansion Communication Bus |
| U1821 00 | Lost Communication with 14V Power Module on Powertrain Expansion Communication Bus |
| U1826 00 | Lost Communication With Multi-Axis Acceleration Sensor Module on Bus B (Chassis Expansion Bus) |
| U1827 00 | Lost Communication With Steering Angle Sensor Module on Bus B (Chassis Expansion Bus) |
| U182D 00 | Lost Communication with Hybrid Powertrain Control Module 2 on Powertrain Expansion Communication Bus |
| U182E 00 | Drive Motor Control Module 1 Lost Communication with Hybrid Powertrain Control Module 2 on Powertrain Expansion Communication Bus |
| U182F 00 | Drive Motor Control Module 2 Lost Communication with Hybrid Powertrain Control Module 2 on Powertrain Expansion Communication Bus |
| U1831 00 | Drive Motor Control Module A Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus |
| U1833 00 | Lost Communication with Electronic Brake Control Module on Chassis Expansion Communication Bus |
| U1838 00 | Lost Communication with Battery Charger Control Module on High Voltage Energy Management Communication Bus |
| U1839 00 | Auxiliary Transmission Fluid Pump Control Module Lost Communication with Engine Control Module |
| U183A 00 | Lost Communication with OnStar Module |
| U183B 00 | Auxiliary Transmission Fluid Pump Control Module Lost Communication with Transmission Control Module |
| U183C 00 | Auxiliary Transmission Fluid Pump Control Module Lost Communication with Hybrid Powertrain Control Module 2 on Powertrain Expansion Communication Bus |
| U183E 00 | Lost Communication with OnStar Module on Low Speed Communication Bus |
| U1844 00 | Battery Energy Control Module Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion Communication Bus |
| U1845 00 | Drive Motor Control Module 1 Lost Communication with Hybrid Powertrain Control Module |
| U1846 00 | Drive Motor Control Module 2 Lost Communication with Hybrid Powertrain Control Module |
| U1849 00 | Drive Motor Control Module 1 Lost Communication with Transmission Control Module |
| U184B 00 | Lost Communication with Electronic Climate Control Module on Low Speed Communication Bus |
| U184C 00 | Lost Communication with Instrument Cluster on Low Speed Communication Bus |
| U184D 00 | Lost Communication with Radio on Low Speed Communication Bus |
| U184E 00 | Lost Communication with Inflatable Restraint Sensing and Diagnostic Module on Low Speed Communication Bus |
| U184F 00 | Electric A/C Compressor Control Module Lost Communication with Engine Control Module |
| U1850 00 | Drive Motor Control Module 2 Lost Communication with Transmission Control Module |
| U1858 00 | Electronic Brake Control Module Lost Communication with Hybrid Powertrain Control Module on Chassis Expansion Communication Bus |
| U185A 00 | Lost Communication with Battery Energy Control Module on High Voltage Energy Management Communication Bus |
| U185B 00 | Battery Energy Control Module Lost Communication with Hybrid Powertrain Control Module 2 on High Voltage Energy Management Communication Bus |
| U185C 00 | Battery Charger Control Module Lost Communication with Hybrid Powertrain Control Module 2 on High Voltage Energy Management Communication Bus |
| U185D 00 | Fuel Injection Control Module Lost Communication with Engine Control Module |
| U185E 00 | Fuel Injection Control Module Lost Communication with BCM |
| U1860 00 | Electric A/C Compressor Control Module Lost Communication with Hybrid Powertrain Control Module 2 |
| U1861 00 | Battery Charger Control Module Lost Communication with Engine Control Module |
| U186A 00 | Electronic Brake Control Module Lost Communication with Engine Control Module |
| U186A 00 | Electronic Brake Control Module Lost Communication with Transmission Control Module |
| U1876 00 | Drive Motor Control Module 1 Lost Communication with Engine Control Module |
| U1879 00 | Drive Motor Control Module 2 Lost Communication with Engine Control Module |
| U1885 00 | Battery Energy Control Module Lost Communication with Hybrid Powertrain Control Module |
| U1886 00 | Battery Energy Control Module Lost Communication with Engine Control Module |
| U1888 00 | Hybrid Powertrain Control Module Lost Communication with Battery Energy Control Module |
| U18B9 00 | Primary High Speed CAN Bus Subnet Configuration List |
| U18BF 00 | Secondary High Speed CAN Bus Subnet Configuration List |
| U1900 00 | Lost Communication With Speech to Text Interface Module |
| U1901 00 | Lost Communication With Front Controls Multifunction Interface Module |
| U2099 00 | High Speed Communication Enable Circuit |
| U2099 01 | High Speed Communication Enable Circuit Short to Battery |
| U2099 02 | High Speed Communication Enable Circuit Short to Ground |
| U2099 04 | High Speed Communication Enable Circuit Open |
| U2099 5A | High Speed Communication Enable Circuit Not Plausible |
| U2100 00 | CAN Bus Communication |
| U2101 00 | CAN Bus Maximum Configuration List |
| 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 Electronic Brake Control Module |
| U2127 00 | Lost Communication with Front HVAC Control Module |
| U2139 00 | Lost Communication with Column Integrated Module |
| U2144 00 | Lost Communication with Distance Sensing Cruise Control Module |
| U2176 00 | Lost Communication with Power Take-Off Control Module |
| U2178 00 | Lost Communication With Trailer Interface Control Module |
| U2400 00 | Fuel Injection Control Module, High-Speed CAN Bus Off |
| U2401 00 | Battery Energy Control Module Dedicated Bus 1 Off |
| U2602 00 | Battery Energy Control Module Lost Communication with Hybrid Powertrain Control Module 2 |
| U2603 00 | Battery Energy Control Module Lost Communication with Hybrid Battery Interface Control Module 1 |
| U2604 00 | Battery Energy Control Module Lost Communication with Hybrid Battery Interface Control Module 2 |
| U2605 00 | Battery Energy Control Module Lost Communication with Hybrid Battery Interface Control Module 3 |
| U2606 00 | Battery Energy Control Module Lost Communication with Hybrid Battery Interface Control Module 4 |
| U2608 00 | Electric A/C Compressor Control Module Lost Communication with Hybrid Powertrain Control Module |
| U2609 00 | Battery Charger Control Module Lost Communication with Hybrid Powertrain Control Module |
| U2611 00 | Auxiliary Transmission Fluid Pump Control Module Lost Communication with Hybrid Powertrain Control Module |
| U2612 00 | Battery Charger Control Module Lost Communication with Hybrid Powertrain Control Module 2 |
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