GM Service Manual Online
For 1990-2009 cars only

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 01

Control Module Communication Bus A Off

U0073 02

Control Module Communication Bus A Off

U0073 04

Control Module Communication Bus A Off

U0074 00

Control Module Communication Bus B Off

U0100 00

Lost Communication With Engine Control Module

U0100 71

Lost Communication With Engine Control Module

U0101 00

Lost Communication With Transmission Control Module

U0101 71

Lost Communication With Transmission Control Module

U0102 00

Lost Communication with Transfer Case Control Module

U0104 00

Lost Communication With Cruise Control Module

U0104 02

Lost Communication With Cruise Control Module

U0104 71

Lost Communication With Cruise Control Module

U0109 00

Lost Communication with Fuel Pump 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

U0121 71

Lost Communication With Electronic Brake Control Module

U0121 72

Lost Communication With Electronic Brake Control Module

U0121 74

Lost Communication With Electronic Brake Control Module

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

U0125 72

Lost Communication With Multi-axis Acceleration Sensor Module

U0125 74

Lost Communication With Multi-axis Acceleration Sensor Module

U0126 00

Lost Communication With Steering Wheel Angle Sensor Module

U0126 71

Lost Communication With Steering Wheel Angle Sensor Module

U0126 72

Lost Communication With Steering Wheel Angle Sensor Module

U0126 74

Lost Communication With Steering Wheel Angle Sensor Module

U0128 00

Lost Communication With Park Brake Control Module

U0128 71

Lost Communication With Park Brake Control Module

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

U0130 72

Lost Communication With Electric Power Steering Control Module

U0130 74

Lost Communication With Electric Power Steering Control Module

U0136 00

Lost Communication With Differential Control Module - Rear

U0136 71

Lost Communication With Differential Control Module - Rear

U0139 00

Lost Communication With Suspension Control Module

U0139 71

Lost Communication With Suspension Control Module

U0140 00

Lost Communication With Body Control Module

U0140 71

Lost Communication With Body Control Module

U0140 72

Lost Communication With Body Control Module

U0140 74

Lost Communication With Body Control Module

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

U0168 00

Lost Communication With Keyless Entry Control Module

U0170 00

Lost Communication With "Restraints System Sensor A"

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

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

U0208 00

Lost Communication With Memory Seat Control Module

U0230 00

Lost Communication With Liftgate Control Module

U0236 00

Lost Communication With Steering Column Lock Module

U023A 00

Lost Communication With Vehicle Direction Camera Control Module

U0252 00

Lost Communication With Trailer Interface Module

U0254 00

Lost Communication With Remote Start Module

U0264 00

Lost Communication With Camera Module - Rear

U0293 00

Lost Communication with with HP2 Powertrain Control Module

U0301 00

Software Incompatibility with Engine 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

U0401 74

Invalid Data Received from ECM

U0402 72

Invalid Data Received From Transmission Control Module

U0402 73

Invalid Data Received From Transmission Control Module

U0402 74

Invalid Data Received From Transmission Control Module

U0405 00

Invalid Data Received From Cruise Control Module

U0415 00

Invalid Data Received From Electronic Brake Control Module

U0415 72

Invalid Data Received From Electronic Brake Control Module

U0415 74

Invalid Data Received From Electronic Brake Control Module

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

U0422 74

Invalid Data Received From Body Control Module

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

U0432 74

Invalid Data Received From Multi-axis Acceleration Sensor Module

U0465 00

Invalid Data Received From Power Take-Off Control Module

U1501 00

LIN Bus 1

U1502 00

LIN Bus 2

U1510 00

LIN Bus 1 Lost Communication With Device 0

U1511 00

LIN Bus 1 Lost Communication With Device 1

U1512 00

LIN Bus 1 Lost Communication With Device 2

U1513 00

LIN Bus 1 Lost Communication With Device 3

U1514 00

LIN Bus 1 Lost Communication With Device 4

U1517 00

LIN Bus 1 Lost Communication With Device 7

U151A 00

LIN Bus 1 Lost Communication With Device 10

U151B 00

LIN Bus 1 Lost Communication With Device 11

U1520 00

LIN Bus 2 Lost Communication With Device 0

U1521 00

LIN Bus 2 Lost Communication With Device 1

U1522 00

LIN Bus 2 Lost Communication With Device 2

U1523 00

LIN Bus 2 Lost Communication With Device 3

U1524 00

LIN Bus 2 Lost Communication With Device 4

U152D 00

LIN Bus 2 Lost Communication With Device 13

U1530 00

LIN Bus 3 Lost Communication With Device 0

U1534 00

LIN Bus 3 Lost Communication With Device 4

U1538 00

LIN Bus 3 Lost Communication With Device 8

U1540 00

LIN Bus 3 Lost Communication With Device 0

U1544 00

LIN Bus 3 Lost Communication With Device 4

U1814 02

Powertrain Wake Up Communication Circuit

U18B9 00

Primary High Speed CAN Bus Subnet Configuration List

U18BF 00

Secondary High Speed CAN Bus Subnet Configuration List

U2099 02

High Speed Communication Enable Circuit

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