Check-engine codes
What does my check-engine code mean?
Plain-English explanations for OBD-II trouble codes: what the code means, the most likely causes, symptoms, and how much labour a repair usually takes.
U3 codes · Network (extended)
- U3000Control Module
- U3001Control Module Improper Shutdown Performance
- U3002Vehicle Identification Number
- U3003Battery Voltage
- U3004Accessory Power Relay
- U3005Retained Accessory Power
- U3006Control Module Input Power A Circuit/Open
- U3007Control Module Input Power B Circuit/Open
- U3008Control Module Ground A
- U3009Control Module Ground B
- U300AIgnition Switch
- U300BIgnition Input Accessory/On/Start
- U300CIgnition Input Off/On/Start
- U300DIgnition Input On/Start
- U300EIgnition Input On
- U300FIgnition Input Accessory
- U3010Ignition Input Start
- U3011Ignition Input Off
- U3012Control Module Improper Wake-up Performance
- U3013Control Module Input Power C Circuit/Open
- U3014Control Module Input Power D Circuit/Open
- U3015Control Module Ground C
- U3016Control Module Ground D
- U3017Control Module Timer/Clock Performance
- U3018Control Module Input Power Circuit A/B Correlation
- U3019Control Module Input Power Circuit B/C Correlation
- U301AControl Module Wake-up Circuit A/Open
- U301BControl Module Wake-up Circuit A Low
- U301CControl Module Wake-up Circuit A High
- U301DControl Module Wake-up Circuit A Performance
- U301EControl Module Wake-up Circuit B/Open
- U301FControl Module Wake-up Circuit B Low
- U3020Control Module Wake-up Circuit B High
- U3021Control Module Wake-up Circuit B Performance
- U3022Ignition Input Accessory/Off
- U3023Control Module Input Power Circuit A - Ignition Input On/Start Circuit Correlation
- U3024Control Module Input Power Circuit B - Ignition Input On/Start Circuit Correlation
- U3025Control Module A Disable Circuit/Open
- U3026Control Module A Disable Circuit Low
- U3027Control Module A Disable Circuit High
- U3028Control Module A Disable Feedback Circuit
- U3029Control Module A Disable Feedback Circuit Low
- U302AControl Module A Disable Feedback Circuit High
- U302BIgnition Output Accessory/On/Start
- U302CIgnition Output Off/On/Start
- U302DIgnition Output On/Start
- U302EIgnition Output On
- U302FIgnition Output Accessory
- U3030Ignition Output Start
- U3031Ignition Output Off
- U3032Ignition Output Accessory/Off
- U3033Control Module Security Certificate Missing/Invalid
- U3034Communication Authentication Key/Certificate Missing/Invalid
- U3035Communication Authentication Signal Invalid Data
- U3036Communication Authentication Signal Performance
- U3500Control Module Input Power A Circuit Range/Performance
- U3501Control Module Input Power A Circuit Low
- U3502Control Module Input Power A Circuit High
- U3503Control Module Input Power A Circuit Intermittent/Erratic
- U3504Control Module Input Power B Circuit Range/Performance
- U3505Control Module Input Power B Circuit Low
- U3506Control Module Input Power B Circuit High
- U3507Control Module Input Power B Circuit Intermittent/Erratic
- U3508Control Module Input Power C Circuit Range/Performance
- U3509Control Module Input Power C Circuit Low
- U350AControl Module Input Power C Circuit High
- U350BControl Module Input Power C Circuit Intermittent/Erratic
- U350CControl Module Cooling Fan Circuit/Open
- U350DControl Module Cooling Fan Circuit Low
- U350EControl Module Cooling Fan Circuit High
- U350FControl Module Cooling Fan Circuit Range/Performance
- U3510Control Module Missing Calibration
- U3511High Voltage System Interlock Circuit B
- U3512High Voltage System Interlock Circuit B Performance
- U3513High Voltage System Interlock Circuit B Low
- U3514High Voltage System Interlock Circuit B High
- U3515High Voltage System Interlock Circuit C
- U3516High Voltage System Interlock Circuit C Performance
- U3517High Voltage System Interlock Circuit C Low
- U3518High Voltage System Interlock Circuit C High
- U3519High Voltage System Interlock Circuit D
- U351AHigh Voltage System Interlock Circuit D Performance
- U351BHigh Voltage System Interlock Circuit D Low
- U351CHigh Voltage System Interlock Circuit D High
- U351DHigh Voltage System Interlock Circuit E
- U351EHigh Voltage System Interlock Circuit E Performance
- U351FHigh Voltage System Interlock Circuit E Low
- U3520High Voltage System Interlock Circuit E High
- U3521High Voltage System Interlock Circuit F
- U3522High Voltage System Interlock Circuit F Performance
- U3523High Voltage System Interlock Circuit F Low
- U3524High Voltage System Interlock Circuit F High
- U3525High Voltage System Interlock Circuit G
- U3526High Voltage System Interlock Circuit G Performance
- U3527High Voltage System Interlock Circuit G Low
- U3528High Voltage System Interlock Circuit G High
- U3529High Voltage System Interlock Circuit H
- U352AHigh Voltage System Interlock Circuit H Performance
- U352BHigh Voltage System Interlock Circuit H Low
- U352CHigh Voltage System Interlock Circuit H High
Code data: OBDex open dataset (CC0), reviewed and rewritten for drivers. Always confirm a diagnosis before replacing parts.