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Powertrain code references — Page 17.

Engine, transmission and powertrain diagnostic references. Exact vehicle and module context still matters.

9,891 code references in powertrain

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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Generic OBD-II
P0665

Intake Manifold Tuning Valve Control Circuit High Bank 2

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Generic OBD-II
P0666

Control Module Internal Temperature Sensor A Circuit

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Generic OBD-II
P0667

Control Module Internal Temperature Sensor A Range/Performance

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Generic OBD-II
P0668

Control Module Internal Temperature Sensor A Circuit Low

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Generic OBD-II
P0669

Control Module Internal Temperature Sensor A Circuit High

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Generic OBD-II
P066A

Cylinder 1 Glow Plug Control Circuit Low

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Generic OBD-II
P066B

Cylinder 1 Glow Plug Control Circuit High

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Generic OBD-II
P066C

Cylinder 2 Glow Plug Control Circuit Low

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Generic OBD-II
P066D

Cylinder 2 Glow Plug Control Circuit High

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Generic OBD-II
P066E

Cylinder 3 Glow Plug Control Circuit Low

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Generic OBD-II
P066F

Cylinder 3 Glow Plug Control Circuit High

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Generic OBD-II
P0670

Glow Plug Control Module 1 Control Circuit/Open

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Generic OBD-II
P0671

Cylinder 1 Glow Plug Circuit/Open

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Generic OBD-II
P0672

Cylinder 2 Glow Plug Circuit/Open

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Generic OBD-II
P0673

Cylinder 3 Glow Plug Circuit/Open

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Generic OBD-II
P0674

Cylinder 4 Glow Plug Circuit/Open

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Generic OBD-II
P0675

Cylinder 5 Glow Plug Circuit/Open

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Generic OBD-II
P0676

Cylinder 6 Glow Plug Circuit/Open

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Generic OBD-II
P0677

Cylinder 7 Glow Plug Circuit/Open

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Generic OBD-II
P0678

Cylinder 8 Glow Plug Circuit/Open

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Generic OBD-II
P0679

Cylinder 9 Glow Plug Circuit/Open

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Generic OBD-II
P067A

Cylinder 4 Glow Plug Control Circuit Low

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Generic OBD-II
P067B

Cylinder 4 Glow Plug Control Circuit High

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Generic OBD-II
P067C

Cylinder 5 Glow Plug Control Circuit Low

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Generic OBD-II
P067D

Cylinder 5 Glow Plug Control Circuit High

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Generic OBD-II
P067E

Cylinder 6 Glow Plug Control Circuit Low

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Generic OBD-II
P067F

Cylinder 6 Glow Plug Control Circuit High

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Generic OBD-II
P0680

Cylinder 10 Glow Plug Circuit/Open

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Generic OBD-II
P0681

Cylinder 11 Glow Plug Circuit/Open

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Generic OBD-II
P0682

Cylinder 12 Glow Plug Circuit/Open

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Generic OBD-II
P0683

Glow Plug Control Module 1 to PCM Communication Circuit

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Generic OBD-II
P0684

Glow Plug Control Module 1 to PCM Communication Circuit Range/Performance

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Generic OBD-II
P0685

ECM/PCM Power Relay Control Circuit/Open

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Generic OBD-II
P0686

ECM/PCM Power Relay Control Circuit Low

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Generic OBD-II
P0687

ECM/PCM Power Relay Control Circuit High

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Generic OBD-II
P0688

ECM/PCM Power Relay Sense Circuit/Open

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Generic OBD-II
P0689

ECM/PCM Power Relay Sense Circuit Low

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Generic OBD-II
P068A

ECM/PCM Power Relay De-Energized Performance - Too Early

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Generic OBD-II
P068B

ECM/PCM Power Relay De-Energized Performance - Too Late

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Generic OBD-II
P068C

Cylinder 7 Glow Plug Control Circuit Low

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Generic OBD-II
P068D

Cylinder 7 Glow Plug Control Circuit High

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Generic OBD-II
P068E

Cylinder 8 Glow Plug Control Circuit Low

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Generic OBD-II
P068F

Cylinder 8 Glow Plug Control Circuit High

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Generic OBD-II
P0690

ECM/PCM Power Relay Sense Circuit High

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Generic OBD-II
P0691

Fan 1 Control Circuit Low

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Generic OBD-II
P0692

Fan 1 Control Circuit High

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Generic OBD-II
P0693

Fan 2 Control Circuit Low

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Generic OBD-II
P0694

Fan 2 Control Circuit High

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Generic OBD-II
P0695

Fan 3 Control Circuit Low

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Generic OBD-II
P0696

Fan 3 Control Circuit High

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Generic OBD-II
P0697

Sensor Reference Voltage C Circuit/Open

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Generic OBD-II
P0698

Sensor Reference Voltage C Circuit Low

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Generic OBD-II
P0699

Sensor Reference Voltage C Circuit High

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Generic OBD-II
P069A

Cylinder 9 Glow Plug Control Circuit Low

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Generic OBD-II
P069B

Cylinder 9 Glow Plug Control Circuit High

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Generic OBD-II
P069C

Cylinder 10 Glow Plug Control Circuit Low

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Generic OBD-II
P069D

Cylinder 10 Glow Plug Control Circuit High

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Generic OBD-II
P069E

Fuel Pump Control Module Requested MIL Illumination

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Generic OBD-II
P069F

Throttle Actuator Control Lamp Control Circuit

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Generic OBD-II
P06A0

Variable A/C Compressor Control Circuit

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Generic OBD-II
P06A1

Variable A/C Compressor Control Circuit Low

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Generic OBD-II
P06A2

Variable A/C Compressor Control Circuit High

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Generic OBD-II
P06A3

Sensor Reference Voltage D Circuit/Open

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Generic OBD-II
P06A4

Sensor Reference Voltage D Circuit Low

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Generic OBD-II
P06A5

Sensor Reference Voltage D Circuit High

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Generic OBD-II
P06A6

Sensor Reference Voltage A Circuit Range/Performance

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Generic OBD-II
P06A7

Sensor Reference Voltage B Circuit Range/Performance

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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.