THE CODE DIRECTORY
Diagnostic code references — Page 24.
Browse canonical reference entries. Each definition keeps its own source and vehicle-applicability limits.
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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Generic OBD-II
P06A8
Sensor Reference Voltage C Circuit Range/Performance
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Generic OBD-II
P06A9
Sensor Reference Voltage D Circuit Range/Performance
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Generic OBD-II
P06AA
Control Module Internal Temperature B Too High
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Generic OBD-II
P06AB
Control Module Internal Temperature Sensor B Circuit
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Generic OBD-II
P06AC
Control Module Internal Temperature Sensor B Range/Performance
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Generic OBD-II
P06AD
Control Module Internal Temperature Sensor B Circuit Low
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Generic OBD-II
P06AE
Control Module Internal Temperature Sensor B Circuit High
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Generic OBD-II
P06AF
Torque Management System - Forced Engine Shutdown
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Generic OBD-II
P06B0
Sensor Power Supply A Circuit/Open
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Generic OBD-II
P06B1
Sensor Power Supply A Circuit Low
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Generic OBD-II
P06B2
Sensor Power Supply A Circuit High
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Generic OBD-II
P06B3
Sensor Power Supply B Circuit/Open
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Generic OBD-II
P06B4
Sensor Power Supply B Circuit Low
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Generic OBD-II
P06B5
Sensor Power Supply B Circuit High
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Generic OBD-II
P06B6
Internal Control Module Knock/Combustion Vibration Sensor Processor 1 Performance
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Generic OBD-II
P06B7
Internal Control Module Knock/Combustion Vibration Sensor Processor 2 Performance
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Generic OBD-II
P06B8
Internal Control Module Non-Volatile Random Access Memory (NVRAM) Error
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Generic OBD-II
P06B9
Cylinder 1 Glow Plug Circuit Range/Performance
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Generic OBD-II
P06BA
Cylinder 2 Glow Plug Circuit Range/Performance
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Generic OBD-II
P06BB
Cylinder 3 Glow Plug Circuit Range/Performance
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Generic OBD-II
P06BC
Cylinder 4 Glow Plug Circuit Range/Performance
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Generic OBD-II
P06BD
Cylinder 5 Glow Plug Circuit Range/Performance
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Generic OBD-II
P06BE
Cylinder 6 Glow Plug Circuit Range/Performance
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Generic OBD-II
P06BF
Cylinder 7 Glow Plug Circuit Range/Performance
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Generic OBD-II
P06C0
Cylinder 8 Glow Plug Circuit Range/Performance
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Generic OBD-II
P06C1
Cylinder 9 Glow Plug Circuit Range/Performance
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Generic OBD-II
P06C2
Cylinder 10 Glow Plug Circuit Range/Performance
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Generic OBD-II
P06C3
Cylinder 11 Glow Plug Circuit Range/Performance
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Generic OBD-II
P06C4
Cylinder 12 Glow Plug Circuit Range/Performance
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Generic OBD-II
P06C5
Cylinder 1 Glow Plug Incorrect
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Generic OBD-II
P06C6
Cylinder 2 Glow Plug Incorrect
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Generic OBD-II
P06C7
Cylinder 3 Glow Plug Incorrect
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Generic OBD-II
P06C8
Cylinder 4 Glow Plug Incorrect
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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.