Fault codes U30xx: control unit: power supply and wake-up
Communication codes between control units. The cause is often a connector, a wire, a power supply or a weak battery: the control unit named is not necessarily faulty.
Official codes: 55, from smallest to largest. Tap a code to get a direct link to share.
| Code | Meaning |
|---|---|
| U3000 | Control Module |
| U3001 | Control Module Improper Shutdown Performance |
| U3002 | Vehicle Identification Number |
| U3003 | Battery Voltage |
| U3004 | Accessory Power Relay |
| U3005 | Retained Accessory Power |
| U3006 | Control Module Input Power A Circuit/Open |
| U3007 | Control Module Input Power B Circuit/Open |
| U3008 | Control Module Ground A |
| U3009 | Control Module Ground B |
| U300A | Ignition Switch |
| U300B | Ignition Input Accessory/On/Start |
| U300C | Ignition Input Off/On/Start |
| U300D | Ignition Input On/Start |
| U300E | Ignition Input On |
| U300F | Ignition Input Accessory |
| U3010 | Ignition Input Start |
| U3011 | Ignition Input Off |
| U3012 | Control Module Improper Wake-up Performance |
| U3013 | Control Module Input Power C Circuit/Open |
| U3014 | Control Module Input Power D Circuit/Open |
| U3015 | Control Module Ground C |
| U3016 | Control Module Ground D |
| U3017 | Control Module Timer/Clock Performance |
| U3018 | Control Module Input Power Circuit A/B Correlation |
| U3019 | Control Module Input Power Circuit B/C Correlation |
| U301A | Control Module Wake-up Circuit A/Open |
| U301B | Control Module Wake-up Circuit A Low |
| U301C | Control Module Wake-up Circuit A High |
| U301D | Control Module Wake-up Circuit A Performance |
| U301E | Control Module Wake-up Circuit B/Open |
| U301F | Control Module Wake-up Circuit B Low |
| U3020 | Control Module Wake-up Circuit B High |
| U3021 | Control Module Wake-up Circuit B Performance |
| U3022 | Ignition Input Accessory/Off |
| U3023 | Control Module Input Power Circuit A - Ignition Input On/Start Circuit Correlation |
| U3024 | Control Module Input Power Circuit B - Ignition Input On/Start Circuit Correlation |
| U3025 | Control Module A Disable Circuit/Open |
| U3026 | Control Module A Disable Circuit Low |
| U3027 | Control Module A Disable Circuit High |
| U3028 | Control Module A Disable Feedback Circuit |
| U3029 | Control Module A Disable Feedback Circuit Low |
| U302A | Control Module A Disable Feedback Circuit High |
| U302B | Ignition Output Accessory/On/Start |
| U302C | Ignition Output Off/On/Start |
| U302D | Ignition Output On/Start |
| U302E | Ignition Output On |
| U302F | Ignition Output Accessory |
| U3030 | Ignition Output Start |
| U3031 | Ignition Output Off |
| U3032 | Ignition Output Accessory/Off |
| U3033 | Control Module Security Certificate Missing/Invalid |
| U3034 | Communication Authentication Key/Certificate Missing/Invalid |
| U3035 | Communication Authentication Signal Invalid Data |
| U3036 | Communication Authentication Signal Performance |
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Official meanings: OBDex (public domain, CC0). Manufacturer codes: dtc-database (MIT license), probable meanings not verified by the manufacturers. The same meaning can vary depending on the model: always have a diagnosis confirmed by a professional.