These 199 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 199 times.
| Code | Definition | Repair coverage |
|---|---|---|
| U0100 | Lost Communication With ECM/PCM A | 4 ranked fixes |
| U0101 | Lost Communication With TCM | 4 ranked fixes |
| U0102 | Lost Communication With Transfer Case Control Module | 4 ranked fixes |
| U0103 | Lost Communication With Gear Shift Control Module A | 4 ranked fixes |
| U0104 | Lost Communication With Cruise Control Module | 4 ranked fixes |
| U0105 | Lost Communication With Fuel Injector Control Module | 4 ranked fixes |
| U0106 | Lost Communication With Glow Plug Control Module 1 | 4 ranked fixes |
| U0107 | Lost Communication With Throttle Actuator A Control Module | 4 ranked fixes |
| U0108 | Lost Communication With Alternative Fuel Control Module | 4 ranked fixes |
| U0109 | Lost Communication With Fuel Pump Control Module A | 4 ranked fixes |
| U010A | Lost Communication With Exhaust Gas Recirculation Control Module A | 4 ranked fixes |
| U010B | Lost Communication With Exhaust Gas Recirculation Control Module B | 4 ranked fixes |
| U010C | Lost Communication With Turbocharger/Supercharger Control Module A | 4 ranked fixes |
| U010D | Lost Communication With Turbocharger/Supercharger Control Module B | 4 ranked fixes |
| U010E | Lost Communication With Reductant Control Module | 4 ranked fixes |
| U0113 | Lost Communication With Emissions Critical Control Information | 4 ranked fixes |
| U0114 | Lost Communication With Four-Wheel Drive Clutch Control Module | 4 ranked fixes |
| U0115 | Lost Communication With ECM/PCM B | 4 ranked fixes |
| U0116 | Lost Communication With Coolant Temperature Control Module | 4 ranked fixes |
| U0117 | Lost Communication With PTO Control Module | 4 ranked fixes |
| U0118 | Lost Communication With Fuel Additive Control Module | 4 ranked fixes |
| U0119 | Lost Communication With Fuel Cell Control Module | 4 ranked fixes |
| U011A | Lost Communication With Exhaust Gas Sensor Module A | 4 ranked fixes |
| U011B | Lost Communication With Rocker Arm Control Module A | 4 ranked fixes |
| U011C | Lost Communication With Rocker Arm Control Module B | 4 ranked fixes |
| U011D | Lost Communication With All Wheel Drive Control Module | 4 ranked fixes |
| U011E | Lost Communication With Throttle Actuator B Control Module | 4 ranked fixes |
| U0120 | Lost Communication With Starter / Generator Control Module | 4 ranked fixes |
| U012D | Lost Communication With Generator A Control Module | 4 ranked fixes |
| U012E | Lost Communication With Camshaft Position Control Module | 4 ranked fixes |
| U012F | Lost Communication With Generator B Control Module | 4 ranked fixes |
| U013C | Lost Communication With Accelerator Pedal Module | 4 ranked fixes |
| U013D | Lost Communication With Vacuum Sensor A | 4 ranked fixes |
| U013E | Lost Communication With Vacuum Sensor B | 4 ranked fixes |
| U016C | Lost Communication With Fuel Pump Control Module B | 4 ranked fixes |
| U016D | Lost Communication With Exhaust Gas Sensor Module B | 4 ranked fixes |
| U019A | Lost Communication With Tachograph Module | 4 ranked fixes |
| U019C | Lost Communication With Glow Plug Control Module 2 | 4 ranked fixes |
| U019D | Lost Communication With Direct Ozone Reduction Catalyst Temperature Sensor | 4 ranked fixes |
| U019E | Lost Communication With Transmission Range Control Module | 4 ranked fixes |
| U019F | Lost Communication With Engine Coolant Pump Control Module | 4 ranked fixes |
| U01B1 | Lost Communication With Particulate Matter Sensor B | 4 ranked fixes |
| U01B2 | Lost Communication With Planetary Gear Set Control Module | 4 ranked fixes |
| U01B5 | Lost Communication With Catalyst Heater Control Module | 4 ranked fixes |
| U01B6 | Lost Communication With Fuel Heater Control Module | 4 ranked fixes |
| U01BC | Lost Communication With Charge Air Cooler Coolant Pump B | 4 ranked fixes |
| U0259 | Lost Communication With Special Purpose Vehicle Control Module A | 4 ranked fixes |
| U025A | Lost Communication With Special Purpose Vehicle Control Module B | 4 ranked fixes |
| U025B | Lost Communication With Special Purpose Vehicle Control Module C | 4 ranked fixes |
| U025C | Lost Communication With Special Purpose Vehicle Control Module D | 4 ranked fixes |
| U0284 | Lost Communication With Active Grille Air Shutter Module A | 4 ranked fixes |
| U0285 | Lost Communication With Active Grille Air Shutter Module B | 4 ranked fixes |
| U0286 | Lost Communication With Radiator Anti Tamper Device | 4 ranked fixes |
| U0287 | Lost Communication With Transmission Fluid Pump Module A | 4 ranked fixes |
| U028A | Lost Communication With Transmission Fluid Pump Module B | 4 ranked fixes |
| U028B | Lost Communication With Active Grille Air Shutter Module C | 4 ranked fixes |
| U028C | Lost Communication With Active Grille Air Shutter Module D | 4 ranked fixes |
| U028D | Lost Communication with Active Aerodynamic Feature Control Module A | 4 ranked fixes |
| U028E | Lost Communication with Active Aerodynamic Feature Control Module B | 4 ranked fixes |
| U028F | Lost Communication with Active Aerodynamic Feature Control Module C | 4 ranked fixes |
| U0290 | Lost Communication with Active Aerodynamic Feature Control Module D | 4 ranked fixes |
| U0291 | Lost Communication With Gear Shift Control Module B | 4 ranked fixes |
| U029D | Lost Communication With NOx Sensor A | 4 ranked fixes |
| U029E | Lost Communication With NOx Sensor B | 4 ranked fixes |
| U029F | Lost Communication With Evaporative Emission System Leak Detection Control Module | 4 ranked fixes |
| U02A1 | Lost Communication With NOx Sensor C | 4 ranked fixes |
| U02A2 | Lost Communication With Reductant Quality Module | 4 ranked fixes |
| U02A3 | Lost Communication With Particulate Matter Sensor | 4 ranked fixes |
| U02A4 | Lost Communication With NH3 Sensor | 4 ranked fixes |
| U02A5 | Lost Communication With Reductant Heater Control Module | 4 ranked fixes |
| U02A7 | Lost Communication With Engine Sound Control 1 | 4 ranked fixes |
| U02A8 | Lost Communication With Engine Sound Control 2 | 4 ranked fixes |
| U02A9 | Lost Communication With Charge Air Cooler Coolant Pump A | 4 ranked fixes |
| U02AA | Lost Communication With Engine Disconnect Clutch | 4 ranked fixes |
| U02AB | Lost Communication With Vehicle Thermal Management Control Module | 4 ranked fixes |
| U02AC | Lost Communication With Turbocharger/Supercharger Boost Control A | 4 ranked fixes |
| U02AD | Lost Communication With Turbocharger/Supercharger Boost Control B | 4 ranked fixes |
| U02AF | Lost Communication With Turbocharger Turbine Inlet Valve Position Sensor | 4 ranked fixes |
| U02B0 | Lost Communication With Turbocharger/Supercharger Boost Control B Position Sensor | 4 ranked fixes |
| U02BB | Lost Communications with EVAP System Purge Pump | 4 ranked fixes |
| U02C0 | Lost Communication With Active Radiator Air Flow Control Module A | 4 ranked fixes |
| U0600 | Lost Communication With Engine Oil Pressure Sensor A | 4 ranked fixes |
| U0601 | Lost Communication With Particulate Filter Pressure Sensor A | 4 ranked fixes |
| U0602 | Lost Communication With Particulate Filter Pressure Sensor B | 4 ranked fixes |
| U0603 | Lost Communication With Fuel Pressure Sensor A | 4 ranked fixes |
| U0604 | Lost Communication With Fuel Pressure Sensor B | 4 ranked fixes |
| U0606 | Lost Communication With Throttle/Pedal Position Sensor/Switch A | 4 ranked fixes |
| U0607 | Lost Communication With Throttle/Pedal Position Sensor/Switch B | 4 ranked fixes |
| U0608 | Lost Communication With Throttle/Pedal Position Sensor/Switch C | 4 ranked fixes |
| U0609 | Lost Communication With Manifold Absolute Pressure/Barometric Pressure Sensor | 4 ranked fixes |
| U060A | Lost Communication With Manifold Absolute Pressure Sensor B | 4 ranked fixes |
| U060B | Lost Communication With Turbocharger/Supercharger Boost Sensor A | 4 ranked fixes |
| U060C | Lost Communication With Turbocharger/Supercharger Boost Sensor B | 4 ranked fixes |
| U060D | Lost Communication With Turbocharger/Supercharger Boost Sensor C | 4 ranked fixes |
| U060E | Lost Communication With Crankcase Pressure Sensor | 4 ranked fixes |
| U060F | Lost Communication With Mass or Volume Air Flow Sensor A | 4 ranked fixes |
| U0610 | Lost Communication With Mass or Volume Air Flow Sensor B | 4 ranked fixes |
| U0611 | Lost Communication With Intake Air Temperature Sensor 1 Bank 1 | 4 ranked fixes |
| U0612 | Lost Communication With Intake Air Temperature Sensor 1 Bank 2 | 4 ranked fixes |
| U0613 | Lost Communication With Intake Air Temperature Sensor 2 Bank 1 | 4 ranked fixes |
| U0614 | Lost Communication With Intake Air Temperature Sensor 2 Bank 2 | 4 ranked fixes |
| U0615 | Lost Communication With Engine Coolant Bypass Valve A | 4 ranked fixes |
| U0616 | Lost Communication With Engine Coolant Bypass Valve B | 4 ranked fixes |
| U0617 | Lost Communication With Engine Coolant Bypass Valve C | 4 ranked fixes |
| U0618 | Lost Communication With Engine Coolant Bypass Valve D | 4 ranked fixes |
| U0619 | Lost Communication With Reductant Level Sensor A | 4 ranked fixes |
| U061A | Lost Communication With Reductant Level Sensor B | 4 ranked fixes |
| U061B | Lost Communication With Reductant Level Sensor C | 4 ranked fixes |
| U061C | Lost Communication With Reductant Temperature Sensor A | 4 ranked fixes |
| U061D | Lost Communication With Reductant Temperature Sensor B | 4 ranked fixes |
| U061F | Lost Communication With Exhaust Gas Temperature Sensor Bank 1 Sensor 1 | 4 ranked fixes |
| U0620 | Lost Communication With Exhaust Gas Temperature Sensor Bank 1 Sensor 2 | 4 ranked fixes |
| U0621 | Lost Communication With Exhaust Gas Temperature Sensor Bank 2 Sensor 1 | 4 ranked fixes |
| U0622 | Lost Communication With Exhaust Gas Temperature Sensor Bank 2 Sensor 2 | 4 ranked fixes |
| U0623 | Lost Communication With Coolant Pump 'A' | 4 ranked fixes |
| U0624 | Lost Communication With Coolant Pump 'B' | 4 ranked fixes |
| U0625 | Lost Communication With Fuel Rail Pressure Sensor Bank 1 | 4 ranked fixes |
| U062F | Lost Communication With Coolant Pump C | 4 ranked fixes |
| U0630 | Lost Communication With Engine Coolant Temperature Sensor 4 | 4 ranked fixes |
| U0631 | Lost Communication With Engine Coolant Temperature Sensor 5 | 4 ranked fixes |
| U0632 | Lost Communication With Fan 1 | 4 ranked fixes |
| U0633 | Lost Communication With Fan 2 | 4 ranked fixes |
| U063B | Lost Communication With Coolant Bypass Valve Actuator A | 4 ranked fixes |
| U063C | Lost Communication With Coolant Bypass Valve Actuator B | 4 ranked fixes |
| U063E | Lost Communication With Exhaust Heat Exchanger Bypass Valve Actuator A | 4 ranked fixes |
| U063F | Lost Communication With Engine Coolant Flow Control Valve Position Sensor | 4 ranked fixes |
| U0640 | Lost Communication With EVAP Fuel Vapor Temperature Sensor Circuit | 4 ranked fixes |
| U0641 | Lost Communication With EVAP System Pressure Sensor/Switch Circuit A | 4 ranked fixes |
| U0642 | Lost Communication With EVAP System Pressure Sensor/Switch Circuit B | 4 ranked fixes |
| U0643 | Lost Communication With Turbocharger/Supercharger A Temperature Sensor | 4 ranked fixes |
| U0644 | Lost Communication With Wastegate Position Sensor A | 4 ranked fixes |
| U0645 | Lost Communication With Active Air Dam Module | 4 ranked fixes |
| U0649 | Lost Communication With Coolant Pump D | 4 ranked fixes |
| U064E | Lost Communication With EGR Cooler Bypass Position Sensor Bank 1 | 4 ranked fixes |
| U064F | Lost Communication With Intake Manifold Runner Position Sensor Bank 1 | 4 ranked fixes |
| U0650 | Lost Communication With Exhaust Pressure Control Valve A Sensor/Switch | 4 ranked fixes |
| U0651 | Lost Communication With EGR Sensor A | 4 ranked fixes |
| U0652 | Lost Communication With EGR Sensor B | 4 ranked fixes |
| U0653 | Lost Communication With EGR Sensor C | 4 ranked fixes |
| U0654 | Lost Communication With Diesel Intake Air Flow A Position Sensor | 4 ranked fixes |
| U0655 | Lost Communication With Diesel Intake Air Flow B Position Sensor | 4 ranked fixes |
| U0656 | Lost Communication With Turbocharger/Supercharger Boost Control A Position Sensor | 4 ranked fixes |
| U0657 | Lost Communication With Turbocharger/Supercharger Bypass Valve A Position Sensor | 4 ranked fixes |
| U0665 | Lost Communication With Fuel Rail Pressure Sensor Bank 2 | 4 ranked fixes |
| U0666 | Lost Communication With Reductant Pressure Sensor | 4 ranked fixes |
| U0667 | Lost Communication With Engine Oil Temperature Sensor A | 4 ranked fixes |
| U0668 | Lost Communication With Engine Oil Level Sensor Circuit | 4 ranked fixes |
| U0669 | Lost Communication With EGR Sensor D | 4 ranked fixes |
| U066A | Lost Communication With EGR Sensor E | 4 ranked fixes |
| U066B | Lost Communication With Turbocharger/Supercharger Bypass Valve B Position Sensor | 4 ranked fixes |
| U066C | Lost Communication With Exhaust Heat Exchanger Bypass Valve Actuator B | 4 ranked fixes |
| U066D | Lost Communication With Charge Air Cooler Temperature Sensor Bank 1 | 4 ranked fixes |
| U066E | Lost Communication With Charge Air Cooler Temperature Sensor Bank 2 | 4 ranked fixes |
| U066F | Lost Communication With Low Pressure Fuel System Sensor | 4 ranked fixes |
| U0670 | Lost Communication With Fuel Temperature Sensor A | 4 ranked fixes |
| U0671 | Lost Communication With Fuel Temperature Sensor B | 4 ranked fixes |
| U0672 | Lost Communication With Engine Coolant Pump | 4 ranked fixes |
| U0673 | Lost Communication With Ion Sense Module | 4 ranked fixes |
| U0674 | Lost Communication With Wastegate Position Sensor B | 4 ranked fixes |
| U0675 | Lost Communication With Turbocharger/Supercharger Speed Sensor A | 4 ranked fixes |
| U0676 | Lost Communication With Fuel Level Sensor A | 4 ranked fixes |
| U0677 | Lost Communication With Fuel Level Sensor B | 4 ranked fixes |
| U0678 | Lost Communication With Fuel Level Sensor C | 4 ranked fixes |
| U0679 | Lost Communication With Transmission Fluid Pressure Sensor/Switch A | 4 ranked fixes |
| U067A | Lost Communication With Transmission Fluid Pressure Sensor/Switch B | 4 ranked fixes |
| U067B | Lost Communication With Engine Disconnect Clutch Pressure Sensor | 4 ranked fixes |
| U067C | Lost Communication With Fan 3 | 4 ranked fixes |
| U067D | Lost Communication With Fan 4 | 4 ranked fixes |
| U067E | Lost Communication With Exhaust Pressure Control Valve B Sensor/Switch | 4 ranked fixes |
| U067F | Lost Communication With Barometric Pressure Sensor A | 4 ranked fixes |
| U0680 | Lost Communication With Barometric Pressure Sensor B | 4 ranked fixes |
| U0681 | Lost Communication With Throttle/Pedal Position Sensor/Switch D | 4 ranked fixes |
| U0682 | Lost Communication With Throttle/Pedal Position Sensor/Switch E | 4 ranked fixes |
| U0683 | Lost Communication With Throttle/Pedal Position Sensor/Switch F | 4 ranked fixes |
| U0684 | Lost Communication With Catalyst Temperature Bank 1 Sensor 1 | 4 ranked fixes |
| U0685 | Lost Communication With Catalyst Temperature Bank 1 Sensor 2 | 4 ranked fixes |
| U0686 | Lost Communication With Catalyst Temperature Bank 2 Sensor 1 | 4 ranked fixes |
| U0687 | Lost Communication With Catalyst Temperature Bank 2 Sensor 2 | 4 ranked fixes |
| U0688 | Lost Communication With Throttle Position Sensor/Switch G | 4 ranked fixes |
| U0689 | Lost Communication With Turbocharger/Supercharger B Temperature Sensor | 4 ranked fixes |
| U068A | Lost Communication With Barometric Pressure Sensor C | 4 ranked fixes |
| U068B | Lost Communication With Turbocharger/Supercharger Inlet Pressure Sensor A | 4 ranked fixes |
| U068C | Lost Communication With Turbocharger/Supercharger Inlet Pressure Sensor B | 4 ranked fixes |
| U068D | Lost Communication With EGR Temperature Sensor A | 4 ranked fixes |
| U068E | Lost Communication With EGR Temperature Sensor B | 4 ranked fixes |
| U068F | Lost Communication With EGR Temperature Sensor C | 4 ranked fixes |
| U0690 | Lost Communication With EGR Temperature Sensor D | 4 ranked fixes |
| U0691 | Lost Communication With Exhaust Pressure Sensor A | 4 ranked fixes |
| U0692 | Lost Communication With Exhaust Pressure Sensor B | 4 ranked fixes |
| U0696 | Lost Communication With Particulate Filter Pressure Sensor C | 4 ranked fixes |
| U0697 | Lost Communication With Particulate Filter Pressure Sensor D | 4 ranked fixes |
| U0698 | Lost Communication with Coolant Pump 'E' | 4 ranked fixes |
| U0699 | Lost Communication with Coolant Pump 'F' | 4 ranked fixes |
| U069A | Lost Communication With Exhaust Gas Temperature Sensor Bank 1 Sensor 3 | 4 ranked fixes |
| U069B | Lost Communication With Exhaust Gas Temperature Sensor Bank 1 Sensor 4 | 4 ranked fixes |
| U069C | Lost Communication With Exhaust Gas Temperature Sensor Bank 2 Sensor 3 | 4 ranked fixes |
| U069D | Lost Communication With Exhaust Gas Temperature Sensor Bank 2 Sensor 4 | 4 ranked fixes |
| U069E | Lost Communication with Coolant Heater A | 4 ranked fixes |
| U069F | Lost Communication With Exhaust Pressure Sensor C | 4 ranked fixes |
This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:
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