U30xx codes: Network codes U3000-U3099
55 network trouble codes from U3000 to U3036. They mostly involve the ignition input, ignition wiring, ignition output and output wiring.
All U30xx codes
12 of these codes usually turn on the check engine light; 20 can often be fixed at home.
| Code | Meaning | Difficulty |
|---|---|---|
| U3000 | Control Module | Hard |
| U3001 | Control Module Improper Shutdown Performance | Medium |
| U3002 | Vehicle Identification Number | Medium |
| U3003 | Battery Voltage | Easy |
| U3004 | Accessory Power Relay | Medium |
| U3005 | Retained Accessory Power | Medium |
| U3006 | Control Module Input Power A Circuit/Open | Medium |
| U3007 | Control Module Input Power B Circuit/Open | Medium |
| U3008 | Control Module Ground A | Medium |
| U3009 | Control Module Ground B | Medium |
| U300A | Ignition Switch | Medium |
| U300B | Ignition Input Accessory/On/Start | Medium |
| U300C | Ignition Input Off/On/Start | Medium |
| U300D | Ignition Input On/Start | Medium |
| U300E | Ignition Input On | Medium |
| U300F | Ignition Input Accessory | Easy |
| U3010 | Ignition Input Start | Medium |
| U3011 | Ignition Input Off | Medium |
| U3012 | Control Module Improper Wake-up Performance | Medium |
| U3013 | Control Module Input Power C Circuit/Open | Medium |
| U3014 | Control Module Input Power D Circuit/Open | Medium |
| U3015 | Control Module Ground C | Medium |
| U3016 | Control Module Ground D | Medium |
| U3017 | Control Module Timer/Clock Performance | Medium |
| U3018 | Control Module Input Power Circuit A/B Correlation | Medium |
| U3019 | Control Module Input Power Circuit B/C Correlation | Hard |
| U301A | Control Module Wake-up Circuit A/Open | Medium |
| U301B | Control Module Wake-up Circuit A Low | Medium |
| U301C | Control Module Wake-up Circuit A High | Medium |
| U301D | Control Module Wake-up Circuit A Performance | Workshop only |
| U301E | Control Module Wake-up Circuit B/Open | Medium |
| U301F | Control Module Wake-up Circuit B Low | Medium |
| U3020 | Control Module Wake-up Circuit B High | Medium |
| U3021 | Control Module Wake-up Circuit B Performance | Workshop only |
| U3022 | Ignition Input Accessory/Off | Medium |
| U3023 | Control Module Input Power Circuit A - Ignition Input On/Start Circuit Correlation | Medium |
| U3024 | Control Module Input Power Circuit B - Ignition Input On/Start Circuit Correlation | Medium |
| U3025 | Control Module A Disable Circuit/Open | Hard |
| U3026 | Control Module A Disable Circuit Low | Hard |
| U3027 | Control Module A Disable Circuit High | Hard |
| U3028 | Control Module A Disable Feedback Circuit | Hard |
| U3029 | Control Module A Disable Feedback Circuit Low | Hard |
| U302A | Control Module A Disable Feedback Circuit High | Hard |
| U302B | Ignition Output Accessory/On/Start | Medium |
| U302C | Ignition Output Off/On/Start | Medium |
| U302D | Ignition Output On/Start | Medium |
| U302E | Ignition Output On | Medium |
| U302F | Ignition Output Accessory | Easy |
| U3030 | Ignition Output Start | Medium |
| U3031 | Ignition Output Off | Medium |
| U3032 | Ignition Output Accessory/Off | Medium |
| U3033 | Control Module Security Certificate Missing/Invalid | Workshop only |
| U3034 | Communication Authentication Key/Certificate Missing/Invalid | Workshop only |
| U3035 | Communication Authentication Signal Invalid Data | Workshop only |
| U3036 | Communication Authentication Signal Performance | Workshop only |