01 A Comprehensive Guide to EGR: Function, Faults, and Fixes • 02 Mechanic's Secret: The Foolproof Way to Identify Oxygen Sen… • 03 What Mechanics Check First When Fuel Usage Suddenly Spikes • 04 Steering Wheel Feels Loose? Uneven Tire Wear? Don't Ignore … • 05 Understanding the Engine Block: A Comprehensive Guide • 06 Why Your Car Revs High But Doesn’t Go Fast • 07 Free VIN Check: Top 10 Free Sites to Get a Used Car's Histo… • 08 Maintaining and Troubleshooting Diesel Particulate Filters … • 09 The Real Reason SUVs Are Dominating the Market • 10 Can Motor Oil Substitute Transmission Fluid? A Comprehensiv… •

DTC codes / U30xx · Network wiring and bus faults

U30xx · Network wiring and bus faults

U3000 Control Module Network U3001 Control Module Improper Shutdown Performance Network U3002 Vehicle Identification Number Network U3003 Battery Voltage Network U3004 Accessory Power Relay Network U3005 Retained Accessory Power Network U3006 Control Module Input Power A Circuit/Open Network U3007 Control Module Input Power B Circuit/Open Network U3008 Control Module Ground A Network U3009 Control Module Ground B Network U300A Ignition Switch Network U300B Ignition Input Accessory/On/Start Network U300C Ignition Input Off/On/Start Network U300D Ignition Input On/Start Network U300E Ignition Input On Network U300F Ignition Input Accessory Network U3010 Ignition Input Start Network U3011 Ignition Input Off Network U3012 Control Module Improper Wake-up Performance Network U3013 Control Module Input Power C Circuit/Open Network U3014 Control Module Input Power D Circuit/Open Network U3015 Control Module Ground C Network U3016 Control Module Ground D Network U3017 Control Module Timer/Clock Performance Network U3018 Control Module Input Power Circuit A/B Correlation Network U3019 Control Module Input Power Circuit B/C Correlation Network U301A Control Module Wake-up Circuit A/Open Network U301B Control Module Wake-up Circuit A Low Network U301C Control Module Wake-up Circuit A High Network U301D Control Module Wake-up Circuit A Performance Network U301E Control Module Wake-up Circuit B/Open Network U301F Control Module Wake-up Circuit B Low Network U3020 Control Module Wake-up Circuit B High Network U3021 Control Module Wake-up Circuit B Performance Network U3022 Ignition Input Accessory/Off Network U3023 Control Module Input Power Circuit A - Ignition Input On/Start Circuit Correlation Network U3024 Control Module Input Power Circuit B - Ignition Input On/Start Circuit Correlation Network U3025 Control Module A Disable Circuit/Open Network U3026 Control Module A Disable Circuit Low Network U3027 Control Module A Disable Circuit High Network U3028 Control Module A Disable Feedback Circuit Network U3029 Control Module A Disable Feedback Circuit Low Network U302A Control Module A Disable Feedback Circuit High Network U302B Ignition Output Accessory/On/Start Network U302C Ignition Output Off/On/Start Network U302D Ignition Output On/Start Network U302E Ignition Output On Network U302F Ignition Output Accessory Network U3030 Ignition Output Start Network U3031 Ignition Output Off Network U3032 Ignition Output Accessory/Off Network U3033 Control Module Security Certificate Missing/Invalid Network U3034 Communication Authentication Key/Certificate Missing/Invalid Network U3035 Communication Authentication Signal Invalid Data Network U3036 Communication Authentication Signal Performance Network
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