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Network/Communication Diagnostic Trouble Codes
This directory contains generic diagnostic trouble codes starting with U. These codes indicate faults detected within the vehicle's network/communication components.
Diagnostic Code Index (1,081 codes)
| DTC | Description |
|---|---|
| U0001 | High Speed CAN Communication Bus |
| U0002 | High Speed CAN Communication Bus Performance |
| U0003 | High Speed CAN Communication Bus (+) Open |
| U0004 | High Speed CAN Communication Bus (+) Low |
| U0005 | High Speed CAN Communication Bus (+) High |
| U0006 | High Speed CAN Communication Bus (-) Open |
| U0007 | High Speed CAN Communication Bus (-) Low |
| U0008 | High Speed CAN Communication Bus (-) High |
| U0009 | High Speed CAN Communication Bus (-) shorted to Bus (+) |
| U0010 | Medium Speed CAN Communication Bus |
| U0011 | Medium Speed CAN Communication Bus Performance |
| U0012 | Medium Speed CAN Communication Bus (+) Open |
| U0013 | Medium Speed CAN Communication Bus (+) Low |
| U0014 | Medium Speed CAN Communication Bus (+) High |
| U0015 | Medium Speed CAN Communication Bus (-) Open |
| U0016 | Medium Speed CAN Communication Bus (-) Low |
| U0017 | Medium Speed CAN Communication Bus (-) High |
| U0018 | Medium Speed CAN Communication Bus (-) shorted to Bus (+) |
| U0019 | Low Speed CAN Communication Bus |
| U0020 | Low Speed CAN Communication Bus Performance |
| U0021 | Low Speed CAN Communication Bus (+) Open |
| U0022 | Low Speed CAN Communication Bus (+) Low |
| U0023 | Low Speed CAN Communication Bus (+) High |
| U0024 | Low Speed CAN Communication Bus (-) Open |
| U0025 | Low Speed CAN Communication Bus (-) Low |
| U0026 | Low Speed CAN Communication Bus (-) High |
| U0027 | Low Speed CAN Communication Bus (-) shorted to Bus (+) |
| U0028 | Vehicle Communication Bus A |
| U0029 | Vehicle Communication Bus A Performance |
| U0030 | Vehicle Communication Bus A (+) Open |
| U0031 | Vehicle Communication Bus A (+) Low |
| U0032 | Vehicle Communication Bus A (+) High |
| U0033 | Vehicle Communication Bus A (-) Open |
| U0034 | Vehicle Communication Bus A (-) Low |
| U0035 | Vehicle Communication Bus A (-) High |
| U0036 | Vehicle Communication Bus A (-) shorted to Bus A (+) |
| U0037 | Vehicle Communication Bus B |
| U0038 | Vehicle Communication Bus B Performance |
| U0039 | Vehicle Communication Bus B (+) Open |
| U0040 | Vehicle Communication Bus B (+) Low |
| U0041 | Vehicle Communication Bus B (+) High |
| U0042 | Vehicle Communication Bus B (-) Open |
| U0043 | Vehicle Communication Bus B (-) Low |
| U0044 | Vehicle Communication Bus B (-) High |
| U0045 | Vehicle Communication Bus B (-) shorted to Bus B (+) |
| U0046 | Vehicle Communication Bus C |
| U0047 | Vehicle Communication Bus C Performance |
| U0048 | Vehicle Communication Bus C (+) Open |
| U0049 | Vehicle Communication Bus C (+) Low |
| U0050 | Vehicle Communication Bus C (+) High |
| U0051 | Vehicle Communication Bus C (-) Open |
| U0052 | Vehicle Communication Bus C (-) Low |
| U0053 | Vehicle Communication Bus C (-) High |
| U0054 | Vehicle Communication Bus C (-) shorted to Bus C (+) |
| U0055 | Vehicle Communication Bus D |
| U0056 | Vehicle Communication Bus D Performance |
| U0057 | Vehicle Communication Bus D (+) Open |
| U0058 | Vehicle Communication Bus D (+) Low |
| U0059 | Vehicle Communication Bus D (+) High |
| U0060 | Vehicle Communication Bus D (-) Open |
| U0061 | Vehicle Communication Bus D (-) Low |
| U0062 | Vehicle Communication Bus D (-) High |
| U0063 | Vehicle Communication Bus D (-) shorted to Bus D (+) |
| U0064 | Vehicle Communication Bus E |
| U0065 | Vehicle Communication Bus E Performance |
| U0066 | Vehicle Communication Bus E (+) Open |
| U0067 | Vehicle Communication Bus E (+) Low |
| U0068 | Vehicle Communication Bus E (+) High |
| U0069 | Vehicle Communication Bus E (-) Open |
| U0070 | Vehicle Communication Bus E (-) Low |
| U0071 | Vehicle Communication Bus E (-) High |
| U0072 | Vehicle Communication Bus E (-) shorted to Bus E (+) |
| U0073 | Control Module Communication Bus A Off |
| U0074 | Control Module Communication Bus B Off |
| U0075 | Control Module Communication Bus C Off |
| U0076 | Control Module Communication Bus D Off |
| U0077 | Control Module Communication Bus E Off |
| U0078 | Control Module Communication Bus F Off |
| U0079 | Control Module Communication Bus G Off |
| U007A | Control Module Communication Bus H Off |
| U007B | Control Module Communication Bus I Off |
| U007C | Control Module Communication Bus J Off |
| U007D | Control Module Communication Bus K Off |
| U007E | Control Module Communication Bus L Off |
| U007F | Control Module Communication Bus M Off |
| U0080 | Vehicle Communication Bus F |
| U0081 | Vehicle Communication Bus F Performance |
| U0082 | Vehicle Communication Bus F + Open |
| U0083 | Vehicle Communication Bus F + Low |
| U0084 | Vehicle Communication Bus F + High |
| U0085 | Vehicle Communication Bus F - Open |
| U0086 | Vehicle Communication Bus F - Low |
| U0087 | Vehicle Communication Bus F - High |
| U0088 | Vehicle Communication Bus F - Shorted to Bus F + |
| U0089 | Vehicle Communication Bus G |
| U008A | Vehicle Communication Bus G Performance |
| U008B | Vehicle Communication Bus G (+) Open |
| U008C | Vehicle Communication Bus G (+) Low |
| U008D | Vehicle Communication Bus G (+) High |
| U008E | Vehicle Communication Bus G (-) Open |
| U008F | Vehicle Communication Bus G (-) Low |
| U0090 | Vehicle Communication Bus G (-) High |
| U0091 | Vehicle Communication Bus G (-) shorted to Bus G (+) |
| U0092 | Vehicle Communication Bus H |
| U0093 | Vehicle Communication Bus H Performance |
| U0094 | Vehicle Communication Bus H (+) Open |
| U0095 | Vehicle Communication Bus H (+) Low |
| U0096 | Vehicle Communication Bus H (+) High |
| U0097 | Vehicle Communication Bus H (-) Open |
| U0098 | Vehicle Communication Bus H (-) Low |
| U0099 | Vehicle Communication Bus H (-) High |
| U009A | Vehicle Communication Bus H (-) shorted to Bus H (+) |
| U009B | Vehicle Communication Bus I |
| U009C | Vehicle Communication Bus I Performance |
| U009D | Vehicle Communication Bus J |
| U009E | Vehicle Communication Bus J Performance |
| U0100 | Lost Communication With ECM/PCM A |
| U0101 | Lost Communication With TCM |
| U0102 | Lost Communication With Transfer Case Control Module |
| U0103 | Lost Communication With Gear Shift Control Module A |
| U0104 | Lost Communication With Cruise Control Module |
| U0105 | Lost Communication With Fuel Injector Control Module |
| U0106 | Lost Communication With Glow Plug Control Module 1 |
| U0107 | Lost Communication With Throttle Actuator A Control Module |
| U0108 | Lost Communication With Alternative Fuel Control Module |
| U0109 | Lost Communication With Fuel Pump Control Module A |
| U010A | Lost Communication With Exhaust Gas Recirculation Control Module A |
| U010B | Lost Communication With Exhaust Gas Recirculation Control Module B |
| U010C | Lost Communication With Turbocharger/Supercharger Control Module A |
| U010D | Lost Communication With Turbocharger/Supercharger Control Module B |
| U010E | Lost Communication With Reductant Control Module |
| U010F | Lost Communication With Air Conditioning Control Module |
| U0110 | Lost Communication With Drive Motor Control Module A |
| U0111 | Lost Communication With Battery Energy Control Module A |
| U0112 | Lost Communication With Battery Energy Control Module B |
| U0113 | Lost Communication With Emissions Critical Control Information |
| U0114 | Lost Communication With Four-Wheel Drive Clutch Control Module |
| U0115 | Lost Communication With ECM/PCM B |
| U0116 | Lost Communication With Coolant Temperature Control Module |
| U0117 | Lost Communication With PTO Control Module |
| U0118 | Lost Communication With Fuel Additive Control Module |
| U0119 | Lost Communication With Fuel Cell Control Module |
| U011A | Lost Communication With Exhaust Gas Sensor Module A |
| U011B | Lost Communication With Rocker Arm Control Module A |
| U011C | Lost Communication With Rocker Arm Control Module B |
| U011D | Lost Communication With All Wheel Drive Control Module |
| U011E | Lost Communication With Throttle Actuator B Control Module |
| U011F | Lost Communication With V2X Module |
| U0120 | Lost Communication With Starter / Generator Control Module |
| U0121 | Lost Communication With Anti-Lock Brake System (ABS) Control Module A |
| U0122 | Lost Communication With Vehicle Dynamics Control Module |
| U0123 | Lost Communication With Yaw Rate Sensor Module |
| U0124 | Lost Communication With Lateral Acceleration Sensor Module |
| U0125 | Lost Communication With Multi-axis Acceleration Sensor Module A |
| U0126 | Lost Communication With Steering Angle Sensor Module |
| U0127 | Lost Communication With Tire Pressure Monitor Module |
| U0128 | Lost Communication With Park Brake Control Module |
| U0129 | Lost Communication With Brake System Control Module A |
| U012A | Lost Communication With Chassis Control Module A |
| U012B | Lost Communication With Chassis Control Module B |
| U012C | Lost Communication With Active Vibration Control Module |
| U012D | Lost Communication With Generator A Control Module |
| U012E | Lost Communication With Camshaft Position Control Module |
| U012F | Lost Communication With Generator B Control Module |
| U0130 | Lost Communication With Steering Effort Control Module |
| U0131 | Lost Communication With Power Steering Control Module A |
| U0132 | Lost Communication With Suspension Control Module A |
| U0133 | Lost Communication With Active Roll Control Module |
| U0134 | Lost Communication With Power Steering Control Module - Rear |
| U0135 | Lost Communication With Differential Control Module - Front |
| U0136 | Lost Communication With Differential Control Module - Rear |
| U0137 | Lost Communication With Trailer Brake Control Module |
| U0138 | Lost Communication With All Terrain Control Module |
| U0139 | Lost Communication With Suspension Control Module B |
| U013C | Lost Communication With Accelerator Pedal Module |
| U013D | Lost Communication With Vacuum Sensor A |
| U013E | Lost Communication With Vacuum Sensor B |
| U013F | Lost Communication With Pedestrian Alert Control Module |
| U0140 | Lost Communication With Body Control Module |
| U0141 | Lost Communication With Body Control Module A |
| U0142 | Lost Communication With Body Control Module B |
| U0143 | Lost Communication With Body Control Module C |
| U0144 | Lost Communication With Body Control Module D |
| U0145 | Lost Communication With Body Control Module E |
| U0146 | Lost Communication With Serial Data Gateway Module A |
| U0147 | Lost Communication With Serial Data Gateway Module B |
| U0148 | Lost Communication With Serial Data Gateway Module C |
| U0149 | Lost Communication With Serial Data Gateway Module D |
| U014A | Lost Communication With Battery Energy Control Module C |
| U014B | Lost Communication With Hybrid/EV Battery Inductive Charging Module |
| U014C | Lost Communication With Battery Energy Control Module D |
| U014D | Lost Communication with Mirror Control Module B |
| U014E | Lost Communication With Multi-axis Acceleration Sensor Module B |
| U0150 | Lost Communication With Serial Data Gateway Module E |
| U0151 | Lost Communication With Restraints Control Module |
| U0152 | Lost Communication With Side Restraints Control Module - Left |
| U0153 | Lost Communication With Side Restraints Control Module - Right |
| U0154 | Lost Communication With Restraints Occupant Classification System Module |
| U0155 | Lost Communication With Instrument Panel Cluster (IPC) Control Module |
| U0156 | Lost Communication With Information Center A |
| U0157 | Lost Communication With Information Center B |
| U0158 | Lost Communication With Head Up Display |
| U0159 | Lost Communication With Parking Assist Control Module A |
| U015A | Lost Communication With Anti-Lock Brake System (ABS) Control Module B |
| U015B | Lost Communication With Power Steering Control Module “B” |
| U015C | Lost Communication With Automated Driving System Control Module A |
| U015D | Lost Communication With Automated Driving System Control Module B |
| U015E | Lost Communication With Automated Driving System Interface Module “A” |
| U015F | Lost Communication With Automated Driving System Interface Module “B |
| U0160 | Lost Communication With Audible Alert Control Module |
| U0161 | Lost Communication With Compass Module |
| U0162 | Lost Communication With Navigation Display Module |
| U0163 | Lost Communication With Navigation Control Module |
| U0164 | Lost Communication With HVAC Control Module |
| U0165 | Lost Communication With HVAC Control Module - Rear |
| U0166 | Lost Communication With Auxiliary Heater Control Module |
| U0167 | Lost Communication With Vehicle Immobilizer Control Module |
| U0168 | Lost Communication With Vehicle Security Control Module |
| U0169 | Lost Communication With Sunroof Control Module |
| U016A | Lost Communication With Global Positioning System Module |
| U016B | Lost Communication With A/C Compressor Control Module |
| U016C | Lost Communication With Fuel Pump Control Module B |
| U016D | Lost Communication With Exhaust Gas Sensor Module B |
| U0170 | Lost Communication With Restraints System Sensor A |
| U0171 | Lost Communication With Restraints System Sensor B |
| U0172 | Lost Communication With Restraints System Sensor C |
| U0173 | Lost Communication With Restraints System Sensor D |
| U0174 | Lost Communication With Restraints System Sensor E |
| U0175 | Lost Communication With Restraints System Sensor F |
| U0176 | Lost Communication With Restraints System Sensor G |
| U0177 | Lost Communication With Restraints System Sensor H |
| U0178 | Lost Communication With Restraints System Sensor I |
| U0179 | Lost Communication With Restraints System Sensor J |
| U017A | Lost Communication With Restraints System Sensor K |
| U017B | Lost Communication With Restraints System Sensor L |
| U017C | Lost Communication With Restraints System Sensor M |
| U017D | Lost Communication With Restraints System Sensor N |
| U017E | Lost Communication With Seat Belt Pretensioner Module A |
| U017F | Lost Communication With Seat Belt Pretensioner Module B |
| U0180 | Lost Communication With Automatic Lighting Control Module |
| U0181 | Lost Communication With Headlamp Leveling Control Module A |
| U0182 | Lost Communication With Lighting Control Module - Front |
| U0183 | Lost Communication With Lighting Control Module - Rear A |
| U0184 | Lost Communication With Radio |
| U0185 | Lost Communication With Antenna Control Module |
| U0186 | Lost Communication With Audio Amplifier A |
| U0187 | Lost Communication With Digital Disc Player/Changer Module A |
| U0188 | Lost Communication With Digital Disc Player/Changer Module B |
| U0189 | Lost Communication With Digital Disc Player/Changer Module C |
| U018A | Lost Communication With Headlamp Leveling Control Module B |
| U0190 | Lost Communication With Digital Disc Player/Changer Module D |
| U0191 | Lost Communication With Television |
| U0192 | Lost Communication With Personal Computer |
| U0193 | Lost Communication With Digital Audio Control Module A |
| U0194 | Lost Communication With Digital Audio Control Module B |
| U0195 | Lost Communication With Subscription Entertainment Receiver Module |
| U0196 | Lost Communication With Entertainment Control Module - Rear A |
| U0197 | Lost Communication With Telephone Control Module |
| U0198 | Lost Communication With Telematic Control Module |
| U0199 | Lost Communication With Door Control Module A |
| U019A | Lost Communication With Tachograph Module |
| U019B | Lost Communication With Battery Charger Control Module A |
| U019C | Lost Communication With Glow Plug Control Module 2 |
| U019D | Lost Communication With Direct Ozone Reduction Catalyst Temperature Sensor |
| U019E | Lost Communication With Transmission Range Control Module |
| U019F | Lost Communication With Engine Coolant Pump Control Module |
| U01A0 | Lost Communication With Hybrid/EV Battery Interface Control Module A |
| U01A1 | Lost Communication With Hybrid/EV Battery Interface Control Module B |
| U01A2 | Lost Communication With Hybrid/EV Battery Interface Control Module C |
| U01A3 | Lost Communication With Hybrid/EV Battery Interface Control Module D |
| U01A4 | Lost Communication With Hybrid/EV Battery Interface Control Module E |
| U01A5 | Lost Communication With Hybrid/EV Battery Interface Control Module F |
| U01A6 | Lost Communication With Hybrid/EV Battery Interface Control Module G |
| U01A7 | Lost Communication With Hybrid/EV Battery Interface Control Module H |
| U01A8 | Lost Communication With Hybrid/EV Battery Interface Control Module I |
| U01A9 | Lost Communication With Hybrid/EV Battery Interface Control Module J |
| U01AA | Lost Communication With Hybrid/EV Battery Interface Control Module K |
| U01AB | Lost Communication With Hybrid/EV Battery Interface Control Module L |
| U01AC | Lost Communication With Hybrid/EV Battery Interface Control Module M |
| U01AD | Lost Communication With Hybrid/EV Battery Interface Control Module N |
| U01AE | Lost Communication With Hybrid/EV Battery Interface Control Module O |
| U01AF | Lost Communication With Hybrid/EV Battery Interface Control Module P |
| U01B0 | Lost Communication With Battery Monitor Module |
| U01B1 | Lost Communication With Particulate Matter Sensor B |
| U01B2 | Lost Communication With Planetary Gear Set Control Module |
| U01B3 | Lost Communication With Brake Blending Actuator |
| U01B4 | Lost Communication With Brake System Control Module B |
| U01B5 | Lost Communication With Catalyst Heater Control Module |
| U01B6 | Lost Communication With Fuel Heater Control Module |
| U01B7 | Lost Communication With Switch Input Module “A” |
| U01B8 | Lost Communication With Switch Input Module “B” |
| U01B9 | Lost Communication With Switch Input Module “C” |
| U01BA | Lost Communication With Park Lock/Pawl Control Module |
| U01BB | Lost Communication With Battery Charger Control Module B |
| U01BC | Lost Communication With Charge Air Cooler Coolant Pump B |
| U01BD | Lost Communication With DC/DC Converter Control Module C |
| U01BE | Lost Communication with Drive Motor A Clutch Actuator |
| U01BF | Lost Communication with Battery Management Control Module |
| U0200 | Lost Communication With Door Control Module B |
| U0201 | Lost Communication With Door Control Module C |