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THE CODE DIRECTORY

Diagnostic code references — Page 23.

Browse canonical reference entries. Each definition keeps its own source and vehicle-applicability limits.

11,786 code references

Generic OBD-II
P0601

Internal Control Module Memory Checksum Error

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Generic OBD-II
P0602

Control Module Programming Error

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Generic OBD-II
P0603

Internal Control Module Keep Alive Memory (KAM) Error

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Generic OBD-II
P0604

Internal Control Module Random Access Memory (RAM) Error

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Generic OBD-II
P0605

Internal Control Module Read Only Memory (ROM) Error

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Generic OBD-II
P0606

Control Module Processor

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Generic OBD-II
P0607

Control Module Performance

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Generic OBD-II
P0608

Control Module VSS Output A

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Generic OBD-II
P0609

Control Module VSS Output B

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Generic OBD-II
P060A

Internal Control Module Monitoring Processor Performance

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Generic OBD-II
P060B

Internal Control Module A/D Processing Performance

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Generic OBD-II
P060C

Internal Control Module Main Processor Performance

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Generic OBD-II
P060D

Internal Control Module Accelerator Pedal Position Performance

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Generic OBD-II
P060E

Internal Control Module Throttle Position Performance

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Generic OBD-II
P060F

Internal Control Module Coolant Temperature Performance

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Generic OBD-II
P0610

Control Module Vehicle Options Error

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Generic OBD-II
P0611

Fuel Injector Control Module Performance

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Generic OBD-II
P0612

Fuel Injector Control Module Relay Control

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Generic OBD-II
P0613

TCM Processor

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Generic OBD-II
P0614

ECM/TCM Incompatible

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Generic OBD-II
P0615

Starter Relay A Circuit

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Generic OBD-II
P0616

Starter Relay A Circuit Low

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Generic OBD-II
P0617

Starter Relay A Circuit High

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Generic OBD-II
P0618

Alternative Fuel Control Module KAM Error

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Generic OBD-II
P0619

Alternative Fuel Control Module RAM/ROM Error

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Generic OBD-II
P061A

Internal Control Module Torque Performance

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Generic OBD-II
P061B

Internal Control Module Torque Calculation Performance

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Generic OBD-II
P061C

Internal Control Module Engine RPM Performance

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Generic OBD-II
P061D

Internal Control Module Engine Air Mass Performance

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Generic OBD-II
P061E

Internal Control Module Brake Signal Performance

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Generic OBD-II
P061F

Internal Control Module Throttle Actuator Controller Performance

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Generic OBD-II
P0620

Generator Control Circuit

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Generic OBD-II
P0621

Generator Lamp/L Terminal Circuit

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Generic OBD-II
P0622

Generator Field/F Terminal Circuit

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Generic OBD-II
P0623

Generator Lamp Control Circuit

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Generic OBD-II
P0624

Fuel Cap Lamp Control Circuit

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Generic OBD-II
P0625

Generator Field/F Terminal Circuit Low

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Generic OBD-II
P0626

Generator Field/F Terminal Circuit High

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Generic OBD-II
P0627

Fuel Pump A Control Circuit/Open

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Generic OBD-II
P0628

Fuel Pump A Control Circuit Low

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Generic OBD-II
P0629

Fuel Pump A Control Circuit High

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Generic OBD-II
P062A

Fuel Pump A Control Circuit Range/Performance

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Generic OBD-II
P062B

Internal Control Module Fuel Injector Control Performance

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Generic OBD-II
P062C

Internal Control Module Vehicle Speed Performance

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Generic OBD-II
P062D

Fuel Injector Driver Circuit Performance Bank 1

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Generic OBD-II
P062E

Fuel Injector Driver Circuit Performance Bank 2

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Generic OBD-II
P062F

Internal Control Module EEPROM Error

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Generic OBD-II
P0630

VIN Not Programmed or Incompatible - ECM/PCM

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Generic OBD-II
P0631

VIN Not Programmed or Incompatible - TCM

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Generic OBD-II
P0632

Odometer Not Programmed - ECM/PCM

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Generic OBD-II
P0633

Immobilizer Key Not Programmed - ECM/PCM

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Generic OBD-II
P0634

Control Module Internal Temperature A Too High

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Generic OBD-II
P0635

Power Steering Control Circuit

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Generic OBD-II
P0636

Power Steering Control Circuit Low

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Generic OBD-II
P0637

Power Steering Control Circuit High

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Generic OBD-II
P0638

Throttle Actuator Control Range/Performance Bank 1

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Generic OBD-II
P0639

Throttle Actuator Control Range/Performance Bank 2

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Generic OBD-II
P063A

Generator Voltage Sense Circuit A

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Generic OBD-II
P063B

Generator Voltage Sense Circuit A Range/Performance

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Generic OBD-II
P063C

Generator Voltage Sense Circuit A Low

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Generic OBD-II
P063D

Generator Voltage Sense Circuit A High

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Generic OBD-II
P063E

Auto Configuration Throttle Input Not Present Bank 1

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Generic OBD-II
P063F

Auto Configuration Engine Coolant Temperature Input Not Present

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Generic OBD-II
P0640

Intake Air Heater Control Circuit

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Generic OBD-II
P0641

Sensor Reference Voltage A Circuit/Open

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Generic OBD-II
P0642

Sensor Reference Voltage A Circuit Low

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Generic OBD-II
P0643

Sensor Reference Voltage A Circuit High

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Generic OBD-II
P0644

Driver Display Serial Communication Circuit

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Generic OBD-II
P0645

A/C Clutch Relay Control Circuit

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Generic OBD-II
P0646

A/C Clutch Relay Control Circuit Low

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Generic OBD-II
P0647

A/C Clutch Relay Control Circuit High

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Generic OBD-II
P0648

Immobilizer Lamp Control Circuit

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Generic OBD-II
P0649

Speed Control Lamp Control Circuit

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Generic OBD-II
P064A

Fuel Pump Control Module A

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Generic OBD-II
P064B

PTO Control Module

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Generic OBD-II
P064C

Glow Plug Control Module 1

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Generic OBD-II
P064D

Internal Control Module O2 Sensor Processor Performance Bank 1

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Generic OBD-II
P064E

Internal Control Module O2 Sensor Processor Performance Bank 2

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Generic OBD-II
P064F

Unauthorized Software/Calibration Detected

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Generic OBD-II
P0650

MIL Control Circuit/Open

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Generic OBD-II
P0651

Sensor Reference Voltage B Circuit/Open

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Generic OBD-II
P0652

Sensor Reference Voltage B Circuit Low

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Generic OBD-II
P0653

Sensor Reference Voltage B Circuit High

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Generic OBD-II
P0654

Engine RPM Output Circuit/Open

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Generic OBD-II
P0655

Engine Hot Lamp Output Control Circuit

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Generic OBD-II
P0656

Fuel Level Output Circuit

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Generic OBD-II
P0657

Actuator Supply Voltage A Circuit/Open

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Generic OBD-II
P0658

Actuator Supply Voltage A Circuit Low

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Generic OBD-II
P0659

Actuator Supply Voltage A Circuit High

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Generic OBD-II
P065A

Generator System Performance

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Generic OBD-II
P065B

Generator A Control Circuit Range/Performance

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Generic OBD-II
P065C

Generator A Mechanical Performance

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Generic OBD-II
P065D

Reductant System Malfunction Lamp Control Circuit

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Generic OBD-II
P065E

Intake Manifold Tuning Valve Performance Bank 1

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Generic OBD-II
P065F

Intake Manifold Tuning Valve Performance Bank 2

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Generic OBD-II
P0660

Intake Manifold Tuning Valve Control Circuit/Open Bank 1

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Generic OBD-II
P0661

Intake Manifold Tuning Valve Control Circuit Low Bank 1

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Generic OBD-II
P0662

Intake Manifold Tuning Valve Control Circuit High Bank 1

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Generic OBD-II
P0663

Intake Manifold Tuning Valve Control Circuit/Open Bank 2

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Generic OBD-II
P0664

Intake Manifold Tuning Valve Control Circuit Low Bank 2

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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.