Network Codes
1,532 OBD-II diagnostic trouble codes in this category.
Showing page 3 of 16 (1,532 codes total)
| Code | Description | Subsystem | Severity |
|---|---|---|---|
| U0157 | Lost Communication With Information Center B | Module Communication | High |
| U0158 | Lost Communication With Head Up Display | Module Communication | High |
| U0159 | Lost Communication with Parking Assist Module | Parking Assist | Medium |
| U015A | Lost Communication With Anti-Lock Brake System (ABS) Control Module B | ABS Communication | Critical |
| U015B | Lost Communication With Power Steering Control Module “B” | Steering Module | High |
| U015C | Lost Communication With Automated Driving System Control Module A | Module Communication | High |
| U015D | Lost Communication With Automated Driving System Control Module B | Module Communication | High |
| U015E | Lost Communication With Automated Driving System Interface Module “A” | Module Communication | High |
| U015F | Lost Communication With Automated Driving System Interface Module “B | Module Communication | High |
| U0160 | Lost Communication With Audible Alert Control Module | Module Communication | High |
| U0161 | Lost Communication With Compass Module | Module Communication | High |
| U0162 | Lost Communication With Navigation Display Module | Module Communication | High |
| U0163 | Lost Communication With Navigation Control Module | Module Communication | High |
| U0164 | Lost Communication with HVAC Control Module | HVAC | Medium |
| U0165 | Lost Communication With HVAC Control Module - Rear | HVAC | Medium |
| U0166 | Lost Communication With Auxiliary Heater Control Module | Module Communication | High |
| U0167 | Lost Communication with Immobilizer Module | Immobilizer | High |
| U0168 | Lost Communication with Vehicle Security Control Module | Security System | Medium |
| U0169 | Lost Communication With Sunroof Control Module | Module Communication | High |
| U016A | Lost Communication With Global Positioning System Module | Module Communication | High |
| U016B | Lost Communication With A/C Compressor Control Module | Module Communication | High |
| U016C | Lost Communication With Fuel Pump Control Module B | Module Communication | High |
| U016D | Lost Communication With Exhaust Gas Sensor Module B | Module Communication | High |
| U0170 | Lost Communication with Restraints Rear Sensor A | Crash Sensor | High |
| U0171 | Lost Communication With Restraints System Sensor B | Airbag Communication | Critical |
| U0172 | Lost Communication With Restraints System Sensor C | Airbag Communication | Critical |
| U0173 | Lost Communication With Restraints System Sensor D | Airbag Communication | Critical |
| U0174 | Lost Communication With Restraints System Sensor E | Airbag Communication | Critical |
| U0175 | Lost Communication With Restraints System Sensor F | Airbag Communication | Critical |
| U0176 | Lost Communication With Restraints System Sensor G | Airbag Communication | Critical |
| U0177 | Lost Communication With Restraints System Sensor H | Airbag Communication | Critical |
| U0178 | Lost Communication With Restraints System Sensor I | Airbag Communication | Critical |
| U0179 | Lost Communication With Restraints System Sensor J | Airbag Communication | Critical |
| U017A | Lost Communication With Restraints System Sensor K | Airbag Communication | Critical |
| U017B | Lost Communication With Restraints System Sensor L | Airbag Communication | Critical |
| U017C | Lost Communication With Restraints System Sensor M | Airbag Communication | Critical |
| U017D | Lost Communication With Restraints System Sensor N | Airbag Communication | Critical |
| U017E | Lost Communication With Seat Belt Pretensioner Module A | Module Communication | High |
| U017F | Lost Communication With Seat Belt Pretensioner Module B | Module Communication | High |
| U0180 | Lost Communication With Automatic Lighting Control Module | Module Communication | High |
| U0181 | Lost Communication With Headlamp Leveling Control Module A | Module Communication | High |
| U0182 | Lost Communication With Lighting Control Module - Front | Module Communication | High |
| U0183 | Lost Communication With Lighting Control Module - Rear A | Module Communication | High |
| U0184 | Lost Communication with Radio | Entertainment | Low |
| U0185 | Lost Communication With Antenna Control Module | Module Communication | High |
| U0186 | Lost Communication with Audio Amplifier A | Entertainment | Low |
| U0187 | Lost Communication With Digital Disc Player/Changer Module A | Module Communication | High |
| U0188 | Lost Communication With Digital Disc Player/Changer Module B | Module Communication | High |
| U0189 | Lost Communication With Digital Disc Player/Changer Module C | Module Communication | High |
| U018A | Lost Communication With Headlamp Leveling Control Module B | Module Communication | High |
| U0190 | Lost Communication With Digital Disc Player/Changer Module D | Module Communication | High |
| U0191 | Lost Communication With Television | Module Communication | High |
| U0192 | Lost Communication With Personal Computer | Module Communication | High |
| U0193 | Lost Communication With Digital Audio Control Module A | Entertainment | Low |
| U0194 | Lost Communication With Digital Audio Control Module B | Entertainment | Low |
| U0195 | Lost Communication with Front Distance Sensor Module | ADAS | High |
| U0196 | Lost Communication with Side Distance Sensor Module | ADAS | Medium |
| U0197 | Lost Communication with Rear Distance Sensor Module | ADAS | Medium |
| U0198 | Lost Communication With Telematic Control Module | Module Communication | High |
| U0199 | Lost Communication with Door Control Module A | Door Module | Medium |
| U019A | Lost Communication With Tachograph Module | Module Communication | High |
| U019B | Lost Communication With Battery Charger Control Module A | EV/Hybrid | Critical |
| U019C | Lost Communication With Glow Plug Control Module 2 | Module Communication | High |
| U019D | Lost Communication With Direct Ozone Reduction Catalyst Temperature Sensor | Module Communication | High |
| U019E | Lost Communication With Transmission Range Control Module | TCM Communication | Critical |
| U019F | Lost Communication With Engine Coolant Pump Control Module | ECM Communication | Critical |
| U01A0 | Lost Communication With Hybrid/EV Battery Interface Control Module A | EV/Hybrid | Critical |
| U01A1 | Lost Communication With Hybrid/EV Battery Interface Control Module B | EV/Hybrid | Critical |
| U01A2 | Lost Communication With Hybrid/EV Battery Interface Control Module C | EV/Hybrid | Critical |
| U01A3 | Lost Communication With Hybrid/EV Battery Interface Control Module D | EV/Hybrid | Critical |
| U01A4 | Lost Communication With Hybrid/EV Battery Interface Control Module E | EV/Hybrid | Critical |
| U01A5 | Lost Communication With Hybrid/EV Battery Interface Control Module F | EV/Hybrid | Critical |
| U01A6 | Lost Communication With Hybrid/EV Battery Interface Control Module G | EV/Hybrid | Critical |
| U01A7 | Lost Communication With Hybrid/EV Battery Interface Control Module H | EV/Hybrid | Critical |
| U01A8 | Lost Communication With Hybrid/EV Battery Interface Control Module I | EV/Hybrid | Critical |
| U01A9 | Lost Communication With Hybrid/EV Battery Interface Control Module J | EV/Hybrid | Critical |
| U01AA | Lost Communication With Hybrid/EV Battery Interface Control Module K | EV/Hybrid | Critical |
| U01AB | Lost Communication With Hybrid/EV Battery Interface Control Module L | EV/Hybrid | Critical |
| U01AC | Lost Communication With Hybrid/EV Battery Interface Control Module M | EV/Hybrid | Critical |
| U01AD | Lost Communication With Hybrid/EV Battery Interface Control Module N | EV/Hybrid | Critical |
| U01AE | Lost Communication With Hybrid/EV Battery Interface Control Module O | EV/Hybrid | Critical |
| U01AF | Lost Communication With Hybrid/EV Battery Interface Control Module P | EV/Hybrid | Critical |
| U01B0 | Lost Communication With Battery Monitor Module | EV/Hybrid | Critical |
| U01B1 | Lost Communication With Particulate Matter Sensor B | Module Communication | High |
| U01B2 | Lost Communication With Planetary Gear Set Control Module | Module Communication | High |
| U01B3 | Lost Communication With Brake Blending Actuator | ABS Communication | Critical |
| U01B4 | Lost Communication With Brake System Control Module B | ABS Communication | Critical |
| U01B5 | Lost Communication With Catalyst Heater Control Module | Module Communication | High |
| U01B6 | Lost Communication With Fuel Heater Control Module | Module Communication | High |
| U01B7 | Lost Communication With Switch Input Module “A” | Module Communication | High |
| U01B8 | Lost Communication With Switch Input Module “B” | Module Communication | High |
| U01B9 | Lost Communication With Switch Input Module “C” | Module Communication | High |
| U01BA | Lost Communication With Park Lock/Pawl Control Module | Module Communication | High |
| U01BB | Lost Communication With Battery Charger Control Module B | EV/Hybrid | Critical |
| U01BC | Lost Communication With Charge Air Cooler Coolant Pump B | Module Communication | High |
| U01BD | Lost Communication With DC/DC Converter Control Module C | Module Communication | High |
| U01BE | Lost Communication with Drive Motor A Clutch Actuator | Module Communication | High |
| U01BF | Lost Communication with Battery Management Control Module | EV/Hybrid | Critical |
| U0200 | Lost Communication with Door Control Module B | Door Module | Medium |
| U0201 | Lost Communication with Door Control Module C | Door Module | Low |
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.