THE CODE DIRECTORY
Diagnostic code references — Page 117.
Browse canonical reference entries. Each definition keeps its own source and vehicle-applicability limits.
Generic OBD-II
U0695
Lost Communication With Hybrid/EV Battery Pack Coolant Pump B
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Generic OBD-II
U0696
Lost Communication With Particulate Filter Pressure Sensor C
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Generic OBD-II
U0697
Lost Communication With Particulate Filter Pressure Sensor D
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Generic OBD-II
U0698
Lost Communication with Coolant Pump “E”
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Generic OBD-II
U0699
Lost Communication with Coolant Pump “F”
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Generic OBD-II
U069A
Lost Communication With Exhaust Gas Temperature Sensor Bank 1 Sensor 3
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Generic OBD-II
U069B
Lost Communication With Exhaust Gas Temperature Sensor Bank 1 Sensor 4
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Generic OBD-II
U069C
Lost Communication With Exhaust Gas Temperature Sensor Bank 2 Sensor 3
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Generic OBD-II
U069D
Lost Communication With Exhaust Gas Temperature Sensor Bank 2 Sensor 4
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Generic OBD-II
U069E
Lost Communication with Coolant Heater A
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Generic OBD-II
U069F
Lost Communication With Exhaust Pressure Sensor C
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Generic OBD-II
U0901
Invalid Data from Ion Sense Module
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Generic OBD-II
U3000
Control Module
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Generic OBD-II
U3001
Control Module Improper Shutdown Performance
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Generic OBD-II
U3002
Vehicle Identification Number
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Generic OBD-II
U3003
Battery Voltage
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Generic OBD-II
U3004
Accessory Power Relay
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Generic OBD-II
U3005
Retained Accessory Power
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Generic OBD-II
U3006
Control Module Input Power A Circuit/Open
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Generic OBD-II
U3007
Control Module Input Power B Circuit/Open
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Generic OBD-II
U3008
Control Module Ground A
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Generic OBD-II
U3009
Control Module Ground B
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Generic OBD-II
U300A
Ignition Switch
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Generic OBD-II
U300B
Ignition Input Accessory/On/Start
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Generic OBD-II
U300C
Ignition Input Off/On/Start
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Generic OBD-II
U300D
Ignition Input On/Start
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Generic OBD-II
U300E
Ignition Input On
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Generic OBD-II
U300F
Ignition Input Accessory
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Generic OBD-II
U3010
Ignition Input Start
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Generic OBD-II
U3011
Ignition Input Off
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Generic OBD-II
U3012
Control Module Improper Wake-up Performance
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Generic OBD-II
U3013
Control Module Input Power C Circuit/Open
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Generic OBD-II
U3014
Control Module Input Power D Circuit/Open
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Generic OBD-II
U3015
Control Module Ground C
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Generic OBD-II
U3016
Control Module Ground D
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Generic OBD-II
U3017
Control Module Timer/Clock Performance
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Generic OBD-II
U3018
Control Module Input Power Circuit A/B Correlation
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Generic OBD-II
U3019
Control Module Input Power Circuit B/C Correlation
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Generic OBD-II
U301A
Control Module Wake-up Circuit A/Open
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Generic OBD-II
U301B
Control Module Wake-up Circuit A Low
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Generic OBD-II
U301C
Control Module Wake-up Circuit A High
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Generic OBD-II
U301D
Control Module Wake-up Circuit A Performance
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Generic OBD-II
U301E
Control Module Wake-up Circuit B/Open
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Generic OBD-II
U301F
Control Module Wake-up Circuit B Low
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Generic OBD-II
U3020
Control Module Wake-up Circuit B High
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Generic OBD-II
U3021
Control Module Wake-up Circuit B Performance
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Generic OBD-II
U3022
Ignition Input Accessory/Off
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Generic OBD-II
U3023
Control Module Input Power Circuit A - Ignition Input On/Start Circuit Correlation
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Generic OBD-II
U3024
Control Module Input Power Circuit B - Ignition Input On/Start Circuit Correlation
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Generic OBD-II
U3025
Control Module A Disable Circuit/Open
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Generic OBD-II
U3026
Control Module A Disable Circuit Low
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Generic OBD-II
U3027
Control Module A Disable Circuit High
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Generic OBD-II
U3028
Control Module A Disable Feedback Circuit
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Generic OBD-II
U3029
Control Module A Disable Feedback Circuit Low
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Generic OBD-II
U302A
Control Module A Disable Feedback Circuit High
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Generic OBD-II
U302B
Ignition Output Accessory/On/Start
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Generic OBD-II
U302C
Ignition Output Off/On/Start
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Generic OBD-II
U302D
Ignition Output On/Start
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Generic OBD-II
U302E
Ignition Output On
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Generic OBD-II
U302F
Ignition Output Accessory
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Generic OBD-II
U3030
Ignition Output Start
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Generic OBD-II
U3031
Ignition Output Off
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Generic OBD-II
U3032
Ignition Output Accessory/Off
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Generic OBD-II
U3033
Control Module Security Certificate Missing/Invalid
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Generic OBD-II
U3034
Communication Authentication Key/Certificate Missing/Invalid
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Generic OBD-II
U3035
Communication Authentication Signal Invalid Data
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Generic OBD-II
U3036
Communication Authentication Signal Performance
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Generic OBD-II
U3500
Control Module Input Power A Circuit Range/Performance
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Generic OBD-II
U3501
Control Module Input Power A Circuit Low
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Generic OBD-II
U3502
Control Module Input Power A Circuit High
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Generic OBD-II
U3503
Control Module Input Power A Circuit Intermittent/Erratic
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Generic OBD-II
U3504
Control Module Input Power B Circuit Range/Performance
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Generic OBD-II
U3505
Control Module Input Power B Circuit Low
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Generic OBD-II
U3506
Control Module Input Power B Circuit High
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Generic OBD-II
U3507
Control Module Input Power B Circuit Intermittent/Erratic
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Generic OBD-II
U3508
Control Module Input Power C Circuit Range/Performance
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Generic OBD-II
U3509
Control Module Input Power C Circuit Low
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Generic OBD-II
U350A
Control Module Input Power C Circuit High
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Generic OBD-II
U350B
Control Module Input Power C Circuit Intermittent/Erratic
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Generic OBD-II
U350C
Control Module Cooling Fan Circuit/Open
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Generic OBD-II
U350D
Control Module Cooling Fan Circuit Low
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Generic OBD-II
U350E
Control Module Cooling Fan Circuit High
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Generic OBD-II
U350F
Control Module Cooling Fan Circuit Range/Performance
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Generic OBD-II
U3510
Control Module Missing Calibration
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Generic OBD-II
U3511
High Voltage System Interlock Circuit B
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Generic OBD-II
U3512
High Voltage System Interlock Circuit B Performance
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Generic OBD-II
U3513
High Voltage System Interlock Circuit B Low
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Generic OBD-II
U3514
High Voltage System Interlock Circuit B High
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Generic OBD-II
U3515
High Voltage System Interlock Circuit C
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Generic OBD-II
U3516
High Voltage System Interlock Circuit C Performance
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Generic OBD-II
U3517
High Voltage System Interlock Circuit C Low
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Generic OBD-II
U3518
High Voltage System Interlock Circuit C High
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Generic OBD-II
U3519
High Voltage System Interlock Circuit D
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Generic OBD-II
U351A
High Voltage System Interlock Circuit D Performance
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Generic OBD-II
U351B
High Voltage System Interlock Circuit D Low
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Generic OBD-II
U351C
High Voltage System Interlock Circuit D High
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Generic OBD-II
U351D
High Voltage System Interlock Circuit E
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Generic OBD-II
U351E
High Voltage System Interlock Circuit E Performance
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Generic OBD-II
U351F
High Voltage System Interlock Circuit E Low
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Generic OBD-II
U3520
High Voltage System Interlock Circuit E High
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These are code references, not a list of confirmed faults on every vehicle. Read the source and applicability notes, then match the exact vehicle, year, engine and scan report.