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U CODE FAMILY

Network code references — Page 10.

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
U0607

Lost Communication With Throttle/Pedal Position Sensor/Switch B

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Generic OBD-II
U0608

Lost Communication With Throttle/Pedal Position Sensor/Switch C

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Generic OBD-II
U0609

Lost Communication With Manifold Absolute Pressure/Barometric Pressure Sensor

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Generic OBD-II
U060A

Lost Communication With Manifold Absolute Pressure Sensor B

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Generic OBD-II
U060B

Lost Communication With Turbocharger/Supercharger Boost Sensor A

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Generic OBD-II
U060C

Lost Communication With Turbocharger/Supercharger Boost Sensor B

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Generic OBD-II
U060D

Lost Communication With Turbocharger/Supercharger Boost Sensor C

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Generic OBD-II
U060E

Lost Communication With Crankcase Pressure Sensor

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Generic OBD-II
U060F

Lost Communication With Mass or Volume Air Flow Sensor A

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Generic OBD-II
U0610

Lost Communication With Mass or Volume Air Flow Sensor B

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Generic OBD-II
U0611

Lost Communication With Intake Air Temperature Sensor 1 Bank 1

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Generic OBD-II
U0612

Lost Communication With Intake Air Temperature Sensor 1 Bank 2

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Generic OBD-II
U0613

Lost Communication With Intake Air Temperature Sensor 2 Bank 1

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Generic OBD-II
U0614

Lost Communication With Intake Air Temperature Sensor 2 Bank 2

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Generic OBD-II
U0615

Lost Communication With Engine Coolant Bypass Valve A

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Generic OBD-II
U0616

Lost Communication With Engine Coolant Bypass Valve B

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Generic OBD-II
U0617

Lost Communication With Engine Coolant Bypass Valve C

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Generic OBD-II
U0618

Lost Communication With Engine Coolant Bypass Valve D

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Generic OBD-II
U0619

Lost Communication With Reductant Level Sensor A

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Generic OBD-II
U061A

Lost Communication With Reductant Level Sensor B

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Generic OBD-II
U061B

Lost Communication With Reductant Level Sensor C

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Generic OBD-II
U061C

Lost Communication With Reductant Temperature Sensor A

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Generic OBD-II
U061D

Lost Communication With Reductant Temperature Sensor B

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Generic OBD-II
U061E

Lost Communication with Battery Isolation/Voltage Stabilization Control Module

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Generic OBD-II
U061F

Lost Communication With Exhaust Gas Temperature Sensor Bank 1 Sensor 1

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Generic OBD-II
U0620

Lost Communication With Exhaust Gas Temperature Sensor Bank 1 Sensor 2

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Generic OBD-II
U0621

Lost Communication With Exhaust Gas Temperature Sensor Bank 2 Sensor 1

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Generic OBD-II
U0622

Lost Communication With Exhaust Gas Temperature Sensor Bank 2 Sensor 2

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Generic OBD-II
U0623

Lost Communication With Coolant Pump “A”

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Generic OBD-II
U0624

Lost Communication With Coolant Pump “B”

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Generic OBD-II
U0625

Lost Communication With Fuel Rail Pressure Sensor Bank 1

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Generic OBD-II
U0626

Lost Communication With A/C Refrigerant Pressure Sensor “A”

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Generic OBD-II
U0627

Lost Communication With A/C Refrigerant Temperature Sensor “A”

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Generic OBD-II
U0628

Lost Communication With A/C Refrigerant Pressure Sensor “B”

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Generic OBD-II
U0629

Lost Communication With A/C Refrigerant Temperature Sensor “B”

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Generic OBD-II
U062A

Lost Communication With A/C Refrigerant Distribution Valve Actuator “A”

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Generic OBD-II
U062B

Lost Communication With A/C Refrigerant Distribution Valve Actuator “B”

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Generic OBD-II
U062C

Lost Communication With A/C Refrigerant Distribution Valve Actuator “C”

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Generic OBD-II
U062D

Lost Communication With A/C Refrigerant Distribution Valve Actuator “D”

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Generic OBD-II
U062E

Lost Communication With A/C Refrigerant Expansion Valve Actuator

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Generic OBD-II
U062F

Lost Communication With Coolant Pump C

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Generic OBD-II
U0630

Lost Communication With Engine Coolant Temperature Sensor 4

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Generic OBD-II
U0631

Lost Communication With Engine Coolant Temperature Sensor 5

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Generic OBD-II
U0632

Lost Communication With Fan 1

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Generic OBD-II
U0633

Lost Communication With Fan 2

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Generic OBD-II
U0634

Lost Communication With Hybrid/EV Battery Pack Coolant Temperature Sensor A

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Generic OBD-II
U0635

Lost Communication With Hybrid/EV Battery Pack Coolant Temperature Sensor B

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Generic OBD-II
U0636

Lost Communication With Hybrid/EV Battery Pack Coolant Control Valve A

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Generic OBD-II
U0637

Lost Communication With Hybrid/EV Battery Pack Coolant Control Valve B

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Generic OBD-II
U0638

Lost Communication With Hybrid/EV Electronics Coolant Temperature Sensor A

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Generic OBD-II
U0639

Lost Communication With Hybrid/EV Electronics Coolant Temperature Sensor B

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Generic OBD-II
U063A

Lost Communication With Hybrid/EV Electronics Coolant Temperature Sensor C

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Generic OBD-II
U063B

Lost Communication With Coolant Bypass Valve Actuator A

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Generic OBD-II
U063C

Lost Communication With Coolant Bypass Valve Actuator B

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Generic OBD-II
U063D

Lost Communication With Hybrid/EV Electronics Coolant Pump A

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Generic OBD-II
U063E

Lost Communication With Exhaust Heat Exchanger Bypass Valve Actuator A

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Generic OBD-II
U063F

Lost Communication With Engine Coolant Flow Control Valve Position Sensor

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Generic OBD-II
U0640

Lost Communication With EVAP Fuel Vapor Temperature Sensor Circuit

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Generic OBD-II
U0641

Lost Communication With EVAP System Pressure Sensor/Switch Circuit A

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Generic OBD-II
U0642

Lost Communication With EVAP System Pressure Sensor/Switch Circuit B

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Generic OBD-II
U0643

Lost Communication With Turbocharger/Supercharger A Temperature Sensor

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Generic OBD-II
U0644

Lost Communication With Wastegate Position Sensor A

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Generic OBD-II
U0645

Lost Communication With Active Air Dam Module

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Generic OBD-II
U0646

Lost Communication With Motor Electronics Coolant Pump A

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Generic OBD-II
U0647

Lost Communication With Motor Electronics Coolant Pump B

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Generic OBD-II
U0648

Lost Communication With Motor Electronics Coolant Pump C

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Generic OBD-II
U0649

Lost Communication With Coolant Pump D

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Generic OBD-II
U064A

Lost Communication With Hybrid/EV Battery Pack Current Sensor A

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Generic OBD-II
U064B

Lost Communication With Hybrid/EV Battery Pack Current Sensor B

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Generic OBD-II
U064C

Lost Communication With Hybrid/EV Battery Pack Current Sensor C

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Generic OBD-II
U064D

Lost Communication With Trailer Brake Control Switch

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Generic OBD-II
U064E

Lost Communication With EGR Cooler Bypass Position Sensor Bank 1

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Generic OBD-II
U064F

Lost Communication With Intake Manifold Runner Position Sensor Bank 1

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Generic OBD-II
U0650

Lost Communication With Exhaust Pressure Control Valve A Sensor/Switch

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Generic OBD-II
U0651

Lost Communication With EGR Sensor A

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Generic OBD-II
U0652

Lost Communication With EGR Sensor B

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Generic OBD-II
U0653

Lost Communication With EGR Sensor C

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Generic OBD-II
U0654

Lost Communication With Diesel Intake Air Flow A Position Sensor

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Generic OBD-II
U0655

Lost Communication With Diesel Intake Air Flow B Position Sensor

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Generic OBD-II
U0656

Lost Communication With Turbocharger/Supercharger Boost Control A Position Sensor

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Generic OBD-II
U0657

Lost Communication With Turbocharger/Supercharger Bypass Valve A Position Sensor

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Generic OBD-II
U0658

Lost Communication With Windshield Temperature Sensor

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Generic OBD-II
U0659

Lost Communication With Left Front Temperature Actuator

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Generic OBD-II
U065A

Lost Communication With Right Front Temperature Actuator

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Generic OBD-II
U065B

Lost Communication With Left Front Mode Actuator

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Generic OBD-II
U065C

Lost Communication With Right Front Mode Actuator

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Generic OBD-II
U065D

Lost Communication With Air Intake Actuator

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Generic OBD-II
U065E

Lost Communication With Ram Air Actuator

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Generic OBD-II
U065F

Lost Communication With Left Rear Temperature Actuator A

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Generic OBD-II
U0660

Lost Communication With Left Rear Temperature Actuator B

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Generic OBD-II
U0661

Lost Communication With Right Rear Temperature Actuator A

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Generic OBD-II
U0662

Lost Communication With Right Rear Temperature Actuator B

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Generic OBD-II
U0663

Lost Communication With Rear Mode Actuator

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Generic OBD-II
U0664

Lost Communication With Rear HVAC Air Cutoff Actuator

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Generic OBD-II
U0665

Lost Communication With Fuel Rail Pressure Sensor Bank 2

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Generic OBD-II
U0666

Lost Communication With Reductant Pressure Sensor

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Generic OBD-II
U0667

Lost Communication With Engine Oil Temperature Sensor A

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Generic OBD-II
U0668

Lost Communication With Engine Oil Level Sensor Circuit

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Generic OBD-II
U0669

Lost Communication With EGR Sensor D

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Generic OBD-II
U066A

Lost Communication With EGR Sensor E

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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.