Network Codes
1,532 OBD-II diagnostic trouble codes in this category.
Showing page 2 of 16 (1,532 codes total)
| Code | Description | Subsystem | Severity |
|---|---|---|---|
| U008F | Vehicle Communication Bus G (-) Low | CAN Bus | High |
| U0090 | Vehicle Communication Bus G (-) High | CAN Bus | High |
| U0091 | Vehicle Communication Bus G (-) shorted to Bus G (+) | CAN Bus | High |
| U0092 | Vehicle Communication Bus H | CAN Bus | High |
| U0093 | Vehicle Communication Bus H Performance | CAN Bus | High |
| U0094 | Vehicle Communication Bus H (+) Open | CAN Bus | High |
| U0095 | Vehicle Communication Bus H (+) Low | CAN Bus | High |
| U0096 | Vehicle Communication Bus H (+) High | CAN Bus | High |
| U0097 | Vehicle Communication Bus H (-) Open | CAN Bus | High |
| U0098 | Vehicle Communication Bus H (-) Low | CAN Bus | High |
| U0099 | Vehicle Communication Bus H (-) High | CAN Bus | High |
| U009A | Vehicle Communication Bus H (-) shorted to Bus H (+) | CAN Bus | High |
| U009B | Vehicle Communication Bus I | CAN Bus | High |
| U009C | Vehicle Communication Bus I Performance | CAN Bus | High |
| U009D | Vehicle Communication Bus J | CAN Bus | High |
| U009E | Vehicle Communication Bus J Performance | CAN Bus | High |
| U0100 | Lost Communication with ECM/PCM | ECM Communication | Critical |
| U0101 | Lost Communication with TCM | TCM Communication | High |
| U0102 | Lost Communication with Transfer Case Control Module | Transfer Case | High |
| U0103 | Lost Communication with Gear Shift Module | Shift Module | High |
| U0104 | Lost Communication with Cruise Control Module | Cruise Control | Medium |
| U0105 | Lost Communication with Fuel Injector Control Module | Fuel Injection | Critical |
| U0106 | Lost Communication with Glow Plug Control Module | Glow Plug | Medium |
| U0107 | Lost Communication with Throttle Actuator Module | Throttle | High |
| U0108 | Lost Communication With Alternative Fuel Control Module | Module Communication | High |
| U0109 | Lost Communication with Fuel Pump Module | Fuel Pump | High |
| U010A | Lost Communication With Exhaust Gas Recirculation Control Module A | Module Communication | High |
| U010B | Lost Communication With Exhaust Gas Recirculation Control Module B | Module Communication | High |
| U010C | Lost Communication With Turbocharger/Supercharger Control Module A | Module Communication | High |
| U010D | Lost Communication With Turbocharger/Supercharger Control Module B | Module Communication | High |
| U010E | Lost Communication With Reductant Control Module | Module Communication | High |
| U010F | Lost Communication With Air Conditioning Control Module | Module Communication | High |
| U0110 | Lost Communication with Drive Motor Control Module | EV/Hybrid | Critical |
| U0111 | Lost Communication with Battery Energy Control Module A | EV/Hybrid | Critical |
| U0112 | Lost Communication With Battery Energy Control Module B | EV/Hybrid | Critical |
| U0113 | Lost Communication With Emissions Critical Control Information | Module Communication | High |
| U0114 | Lost Communication with Four-Wheel Drive Clutch Control Module | 4WD System | High |
| U0115 | Lost Communication With ECM/PCM B | ECM Communication | Critical |
| U0116 | Lost Communication With Coolant Temperature Control Module | Module Communication | High |
| U0117 | Lost Communication With PTO Control Module | Module Communication | High |
| U0118 | Lost Communication With Fuel Additive Control Module | Module Communication | High |
| U0119 | Lost Communication With Fuel Cell Control Module | Module Communication | High |
| U011A | Lost Communication With Exhaust Gas Sensor Module A | Module Communication | High |
| U011B | Lost Communication With Rocker Arm Control Module A | Module Communication | High |
| U011C | Lost Communication With Rocker Arm Control Module B | Module Communication | High |
| U011D | Lost Communication With All Wheel Drive Control Module | Module Communication | High |
| U011E | Lost Communication With Throttle Actuator B Control Module | Module Communication | High |
| U011F | Lost Communication With V2X Module | Module Communication | High |
| U0120 | Lost Communication With Starter / Generator Control Module | Module Communication | High |
| U0121 | Lost Communication with ABS Module | ABS | High |
| U0122 | Lost Communication with Vehicle Dynamics Control Module | ESC Communication | Critical |
| U0123 | Lost Communication with Yaw Rate Sensor Module | Stability Sensor | High |
| U0124 | Lost Communication with Lateral Acceleration Sensor Module | Stability Sensor | High |
| U0125 | Lost Communication with Multi-Axis Acceleration Sensor Module | Stability Sensor | High |
| U0126 | Lost Communication with Steering Angle Sensor Module | Steering Sensor | High |
| U0127 | Lost Communication with TPMS Module | TPMS | Medium |
| U0128 | Lost Communication with Parking Brake Control Module | Parking Brake | High |
| U0129 | Lost Communication with Brake Booster Control Module | Brake Booster | Critical |
| U012A | Lost Communication With Chassis Control Module A | Module Communication | High |
| U012B | Lost Communication With Chassis Control Module B | Module Communication | High |
| U012C | Lost Communication With Active Vibration Control Module | Module Communication | High |
| U012D | Lost Communication With Generator A Control Module | Module Communication | High |
| U012E | Lost Communication With Camshaft Position Control Module | Module Communication | High |
| U012F | Lost Communication With Generator B Control Module | Module Communication | High |
| U0130 | Lost Communication With Steering Effort Control Module | Steering Module | High |
| U0131 | Lost Communication with Power Steering Module | Power Steering | High |
| U0132 | Lost Communication With Suspension Control Module A | Module Communication | High |
| U0133 | Lost Communication With Active Roll Control Module | Module Communication | High |
| U0134 | Lost Communication With Power Steering Control Module - Rear | Steering Module | High |
| U0135 | Lost Communication With Differential Control Module - Front | Module Communication | High |
| U0136 | Lost Communication With Differential Control Module - Rear | Module Communication | High |
| U0137 | Lost Communication With Trailer Brake Control Module | ABS Communication | Critical |
| U0138 | Lost Communication With All Terrain Control Module | Module Communication | High |
| U0139 | Lost Communication With Suspension Control Module B | Module Communication | High |
| U013C | Lost Communication With Accelerator Pedal Module | Module Communication | High |
| U013D | Lost Communication With Vacuum Sensor A | Module Communication | High |
| U013E | Lost Communication With Vacuum Sensor B | Module Communication | High |
| U013F | Lost Communication With Pedestrian Alert Control Module | Module Communication | High |
| U0140 | Lost Communication with BCM | Body Control | Medium |
| U0141 | Lost Communication with Body Control Module A | BCM Communication | High |
| U0142 | Lost Communication with Body Control Module B | BCM Communication | Medium |
| U0143 | Lost Communication With Body Control Module C | BCM Communication | High |
| U0144 | Lost Communication With Body Control Module D | BCM Communication | High |
| U0145 | Lost Communication With Body Control Module E | BCM Communication | High |
| U0146 | Lost Communication with Gateway Module | Gateway | High |
| U0147 | Lost Communication With Serial Data Gateway Module B | Module Communication | High |
| U0148 | Lost Communication with Occupant Restraint Controller | Airbag Communication | Critical |
| U0149 | Lost Communication With Serial Data Gateway Module D | Module Communication | High |
| U014A | Lost Communication With Battery Energy Control Module C | EV/Hybrid | Critical |
| U014B | Lost Communication With Hybrid/EV Battery Inductive Charging Module | EV/Hybrid | Critical |
| U014C | Lost Communication With Battery Energy Control Module D | EV/Hybrid | Critical |
| U014D | Lost Communication with Mirror Control Module B | Module Communication | High |
| U014E | Lost Communication With Multi-axis Acceleration Sensor Module B | Module Communication | High |
| U0150 | Lost Communication With Serial Data Gateway Module E | Module Communication | High |
| U0151 | Lost Communication with SRS Module | Airbag/SRS | Critical |
| U0152 | Lost Communication with Side Restraints Crash Sensor A | Crash Sensor | Critical |
| U0153 | Lost Communication With Side Restraints Control Module - Right | Airbag Communication | Critical |
| U0154 | Lost Communication With Restraints Occupant Classification System Module | Airbag Communication | Critical |
| U0155 | Lost Communication with Instrument Cluster | Instrument Cluster | Medium |
| U0156 | Lost Communication With Information Center A | Module Communication | High |
About Network Codes
This page lists all 1,532 OBD-II diagnostic trouble codes classified under the Network category. These codes are stored by your vehicle's onboard computer when a sensor detects a malfunction in the network system. Each code begins with a letter indicating the system (P for Powertrain, B for Body, C for Chassis, U for Network) followed by four digits that identify the specific fault.
When your check engine light comes on, an OBD-II scanner reads these stored codes to help pinpoint the problem. Generic codes (where the second digit is 0) follow the SAE J2012 standard and mean the same thing on every vehicle. Manufacturer-specific codes (where the second digit is 1) may have different meanings depending on the vehicle brand.
Click any code in the table above to see its full description, possible causes, common symptoms, and step-by-step repair guidance. Use the search box to quickly find a specific code within this category.