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U CODE FAMILY

Network code references — Page 11.

Communication and network diagnostic references. A communication code does not identify a failed module by itself.

1,228 code references in network

Generic OBD-II
U066B

Lost Communication With Turbocharger/Supercharger Bypass Valve B Position Sensor

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Generic OBD-II
U066C

Lost Communication With Exhaust Heat Exchanger Bypass Valve Actuator B

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Generic OBD-II
U066D

Lost Communication With Charge Air Cooler Temperature Sensor Bank 1

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Generic OBD-II
U066E

Lost Communication With Charge Air Cooler Temperature Sensor Bank 2

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Generic OBD-II
U066F

Lost Communication With Low Pressure Fuel System Sensor

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Generic OBD-II
U0670

Lost Communication With Fuel Temperature Sensor A

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Generic OBD-II
U0671

Lost Communication With Fuel Temperature Sensor B

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Generic OBD-II
U0672

Lost Communication With Engine Coolant Pump

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Generic OBD-II
U0673

Lost Communication With Ion Sense Module

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Generic OBD-II
U0674

Lost Communication With Wastegate Position Sensor B

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Generic OBD-II
U0675

Lost Communication With Turbocharger/Supercharger Speed Sensor A

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Generic OBD-II
U0676

Lost Communication With Fuel Level Sensor A

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Generic OBD-II
U0677

Lost Communication With Fuel Level Sensor B

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Generic OBD-II
U0678

Lost Communication With Fuel Level Sensor C

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Generic OBD-II
U0679

Lost Communication With Transmission Fluid Pressure Sensor/Switch A

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Generic OBD-II
U067A

Lost Communication With Transmission Fluid Pressure Sensor/Switch B

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Generic OBD-II
U067B

Lost Communication With Engine Disconnect Clutch Pressure Sensor

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Generic OBD-II
U067C

Lost Communication With Fan 3

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Generic OBD-II
U067D

Lost Communication With Fan 4

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Generic OBD-II
U067E

Lost Communication With Exhaust Pressure Control Valve B Sensor/Switch

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Generic OBD-II
U067F

Lost Communication With Barometric Pressure Sensor A

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Generic OBD-II
U0680

Lost Communication With Barometric Pressure Sensor B

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Generic OBD-II
U0681

Lost Communication With Throttle/Pedal Position Sensor/Switch D

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Generic OBD-II
U0682

Lost Communication With Throttle/Pedal Position Sensor/Switch E

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Generic OBD-II
U0683

Lost Communication With Throttle/Pedal Position Sensor/Switch F

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Generic OBD-II
U0684

Lost Communication With Catalyst Temperature Bank 1 Sensor 1

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Generic OBD-II
U0685

Lost Communication With Catalyst Temperature Bank 1 Sensor 2

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Generic OBD-II
U0686

Lost Communication With Catalyst Temperature Bank 2 Sensor 1

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Generic OBD-II
U0687

Lost Communication With Catalyst Temperature Bank 2 Sensor 2

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Generic OBD-II
U0688

Lost Communication With Throttle Position Sensor/Switch G

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Generic OBD-II
U0689

Lost Communication With Turbocharger/Supercharger B Temperature Sensor

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Generic OBD-II
U068A

Lost Communication With Barometric Pressure Sensor C

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Generic OBD-II
U068B

Lost Communication With Turbocharger/Supercharger Inlet Pressure Sensor A

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Generic OBD-II
U068C

Lost Communication With Turbocharger/Supercharger Inlet Pressure Sensor B

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Generic OBD-II
U068D

Lost Communication With EGR Temperature Sensor A

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Generic OBD-II
U068E

Lost Communication With EGR Temperature Sensor B

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Generic OBD-II
U068F

Lost Communication With EGR Temperature Sensor C

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Generic OBD-II
U0690

Lost Communication With EGR Temperature Sensor D

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Generic OBD-II
U0691

Lost Communication With Exhaust Pressure Sensor A

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Generic OBD-II
U0692

Lost Communication With Exhaust Pressure Sensor B

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Generic OBD-II
U0693

Lost Communication With Humidity Sensor

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Generic OBD-II
U0694

Lost Communication With Hybrid/EV Battery Pack Coolant Pump A

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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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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.