OBD-II · CODE FAMILY
Codes U30xx — what they mean
U30xx is a family of 55 manufacturer-specific OBD2 codes covering network and electrical faults. Each U30xx code below links to its own page with causes, diagnosis and the parts to fix it.
55 codesNetwork systems
FAMILY
RangeU3000–U3036
Codes55
TROUBLEATLAS APP
01All codes in this family
One rich, indexed page — not thousands of empty ones. Each code links to its own page.
| Code | Meaning — click to open the code page | System | Severity |
|---|---|---|---|
| U3000 | Control Module → /auto/codes/u3000/ Control Module | Network | Medium |
| U3001 | Control Module Improper Shutdown Performance → /auto/codes/u3001/ Control Module Improper Shutdown Performance | Network | Medium |
| U3002 | Vehicle Identification Number → /auto/codes/u3002/ Vehicle Identification Number | Network | Medium |
| U3003 | Battery Voltage → /auto/codes/u3003/ Battery Voltage | Network | Medium |
| U3004 | Accessory Power Relay → /auto/codes/u3004/ Accessory Power Relay | Network | Medium |
| U3005 | Retained Accessory Power → /auto/codes/u3005/ Retained Accessory Power | Network | Medium |
| U3006 | Control Module Input Power A Circuit/Open → /auto/codes/u3006/ Control Module Input Power A Circuit/Open | Network | Medium |
| U3007 | Control Module Input Power B Circuit/Open → /auto/codes/u3007/ Control Module Input Power B Circuit/Open | Network | Medium |
| U3008 | Control Module Ground A → /auto/codes/u3008/ Control Module Ground A | Network | Medium |
| U3009 | Control Module Ground B → /auto/codes/u3009/ Control Module Ground B | Network | Medium |
| U300A | Ignition Switch → /auto/codes/u300a/ Ignition Switch | Network | Medium |
| U300B | Ignition Input Accessory/On/Start → /auto/codes/u300b/ Ignition Input Accessory/On/Start | Network | Medium |
| U300C | Ignition Input Off/On/Start → /auto/codes/u300c/ Ignition Input Off/On/Start | Network | Medium |
| U300D | Ignition Input On/Start → /auto/codes/u300d/ Ignition Input On/Start | Network | Medium |
| U300E | Ignition Input On → /auto/codes/u300e/ Ignition Input On | Network | Medium |
| U300F | Ignition Input Accessory → /auto/codes/u300f/ Ignition Input Accessory | Network | Medium |
| U3010 | Ignition Input Start → /auto/codes/u3010/ Ignition Input Start | Network | Medium |
| U3011 | Ignition Input Off → /auto/codes/u3011/ Ignition Input Off | Network | Medium |
| U3012 | Control Module Improper Wake-up Performance → /auto/codes/u3012/ Control Module Improper Wake-up Performance | Network | Medium |
| U3013 | Control Module Input Power C Circuit/Open → /auto/codes/u3013/ Control Module Input Power C Circuit/Open | Network | Medium |
| U3014 | Control Module Input Power D Circuit/Open → /auto/codes/u3014/ Control Module Input Power D Circuit/Open | Network | Medium |
| U3015 | Control Module Ground C → /auto/codes/u3015/ Control Module Ground C | Network | Medium |
| U3016 | Control Module Ground D → /auto/codes/u3016/ Control Module Ground D | Network | Medium |
| U3017 | Control Module Timer/Clock Performance → /auto/codes/u3017/ Control Module Timer/Clock Performance | Network | Medium |
| U3018 | Control Module Input Power Circuit A/B Correlation → /auto/codes/u3018/ Control Module Input Power Circuit A/B Correlation | Network | Medium |
| U3019 | Control Module Input Power Circuit B/C Correlation → /auto/codes/u3019/ Control Module Input Power Circuit B/C Correlation | Network | Medium |
| U301A | Control Module Wake-up Circuit A/Open → /auto/codes/u301a/ Control Module Wake-up Circuit A/Open | Network | Medium |
| U301B | Control Module Wake-up Circuit A Low → /auto/codes/u301b/ Control Module Wake-up Circuit A Low | Network | Medium |
| U301C | Control Module Wake-up Circuit A High → /auto/codes/u301c/ Control Module Wake-up Circuit A High | Network | Medium |
| U301D | Control Module Wake-up Circuit A Performance → /auto/codes/u301d/ Control Module Wake-up Circuit A Performance | Network | Medium |
| U301E | Control Module Wake-up Circuit B/Open → /auto/codes/u301e/ Control Module Wake-up Circuit B/Open | Network | Medium |
| U301F | Control Module Wake-up Circuit B Low → /auto/codes/u301f/ Control Module Wake-up Circuit B Low | Network | Medium |
| U3020 | Control Module Wake-up Circuit B High → /auto/codes/u3020/ Control Module Wake-up Circuit B High | Network | Medium |
| U3021 | Control Module Wake-up Circuit B Performance → /auto/codes/u3021/ Control Module Wake-up Circuit B Performance | Network | Medium |
| U3022 | Ignition Input Accessory/Off → /auto/codes/u3022/ Ignition Input Accessory/Off | Network | Medium |
| U3023 | Control Module Input Power Circuit A - Ignition Input On/Sta → /auto/codes/u3023/ Control Module Input Power Circuit A - Ignition Input On/Start Circuit Correlation | Network | Medium |
| U3024 | Control Module Input Power Circuit B - Ignition Input On/Sta → /auto/codes/u3024/ Control Module Input Power Circuit B - Ignition Input On/Start Circuit Correlation | Network | Medium |
| U3025 | Control Module A Disable Circuit/Open → /auto/codes/u3025/ Control Module A Disable Circuit/Open | Network | Medium |
| U3026 | Control Module A Disable Circuit Low → /auto/codes/u3026/ Control Module A Disable Circuit Low | Network | Medium |
| U3027 | Control Module A Disable Circuit High → /auto/codes/u3027/ Control Module A Disable Circuit High | Network | Medium |
| U3028 | Control Module A Disable Feedback Circuit → /auto/codes/u3028/ Control Module A Disable Feedback Circuit | Network | Medium |
| U3029 | Control Module A Disable Feedback Circuit Low → /auto/codes/u3029/ Control Module A Disable Feedback Circuit Low | Network | Medium |
| U302A | Control Module A Disable Feedback Circuit High → /auto/codes/u302a/ Control Module A Disable Feedback Circuit High | Network | Medium |
| U302B | Ignition Output Accessory/On/Start → /auto/codes/u302b/ Ignition Output Accessory/On/Start | Network | Medium |
| U302C | Ignition Output Off/On/Start → /auto/codes/u302c/ Ignition Output Off/On/Start | Network | Medium |
| U302D | Ignition Output On/Start → /auto/codes/u302d/ Ignition Output On/Start | Network | Medium |
| U302E | Ignition Output On → /auto/codes/u302e/ Ignition Output On | Network | Medium |
| U302F | Ignition Output Accessory → /auto/codes/u302f/ Ignition Output Accessory | Network | Medium |
| U3030 | Ignition Output Start → /auto/codes/u3030/ Ignition Output Start | Network | Medium |
| U3031 | Ignition Output Off → /auto/codes/u3031/ Ignition Output Off | Network | Medium |
| U3032 | Ignition Output Accessory/Off → /auto/codes/u3032/ Ignition Output Accessory/Off | Network | Medium |
| U3033 | Control Module Security Certificate Missing/Invalid → /auto/codes/u3033/ Control Module Security Certificate Missing/Invalid | Network | Medium |
| U3034 | Communication Authentication Key/Certificate Missing/Invalid → /auto/codes/u3034/ Communication Authentication Key/Certificate Missing/Invalid | Network | Medium |
| U3035 | Communication Authentication Signal Invalid Data → /auto/codes/u3035/ Communication Authentication Signal Invalid Data | Network | Medium |
| U3036 | Communication Authentication Signal Performance → /auto/codes/u3036/ Communication Authentication Signal Performance | Network | Medium |
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