P06xx codes — Computer and auxiliary outputs
256 codes in this group. The last column counts owner complaints that mention the code.
| Code | Meaning | Owner reports |
|---|---|---|
| P0600 | Serial Communication Link | 2 |
| P0601 | Internal Control Module Memory Checksum Error | 1 |
| P0602 | Control Module Programming Error | |
| P0603 | Internal Control Module Keep Alive Memory (KAM) Error | |
| P0604 | Internal Control Module Random Access Memory (RAM) Error | 1 |
| P0605 | Internal Control Module Read Only Memory (ROM) Error | 2 |
| P0606 | Control Module Processor | |
| P0607 | Control Module Performance | 2 |
| P0608 | Control Module VSS Output A | |
| P0609 | Control Module VSS Output B | |
| P060A | Internal Control Module Monitoring Processor Performance | |
| P060B | Internal Control Module A/D Processing Performance | |
| P060C | Internal Control Module Main Processor Performance | 6 |
| P060D | Internal Control Module Accelerator Pedal Position Performance | |
| P060E | Internal Control Module Throttle Position Performance | |
| P060F | Internal Control Module Coolant Temperature Performance | |
| P0610 | Control Module Vehicle Options Error | |
| P0611 | Fuel Injector Control Module Performance | |
| P0612 | Fuel Injector Control Module Relay Control | |
| P0613 | TCM Processor | 1 |
| P0614 | ECM/TCM Incompatible | |
| P0615 | Starter Relay A Circuit | |
| P0616 | Starter Relay A Circuit Low | |
| P0617 | Starter Relay A Circuit High | |
| P0618 | Alternative Fuel Control Module KAM Error | |
| P0619 | Alternative Fuel Control Module RAM/ROM Error | |
| P061A | Internal Control Module Torque Performance | 2 |
| P061B | Internal Control Module Torque Calculation Performance | 1 |
| P061C | Internal Control Module Engine RPM Performance | |
| P061D | Internal Control Module Engine Air Mass Performance | |
| P061E | Internal Control Module Brake Signal Performance | |
| P061F | Internal Control Module Throttle Actuator Controller Performance | |
| P0620 | Generator Control Circuit | |
| P0621 | Generator Lamp/L Terminal Circuit | |
| P0622 | Generator Field/F Terminal Circuit | |
| P0623 | Generator Lamp Control Circuit | |
| P0624 | Fuel Cap Lamp Control Circuit | |
| P0625 | Generator Field/F Terminal Circuit Low | |
| P0626 | Generator Field/F Terminal Circuit High | |
| P0627 | Fuel Pump A Control Circuit/Open | 2 |
| P0628 | Fuel Pump A Control Circuit Low | |
| P0629 | Fuel Pump A Control Circuit High | |
| P062A | Fuel Pump A Control Circuit Range/Performance | |
| P062B | Internal Control Module Fuel Injector Control Performance | |
| P062C | Internal Control Module Vehicle Speed Performance | 2 |
| P062D | Fuel Injector Driver Circuit Performance Bank 1 | |
| P062E | Fuel Injector Driver Circuit Performance Bank 2 | 1 |
| P062F | Internal Control Module EEPROM Error | |
| P0630 | VIN Not Programmed or Incompatible ECM/PCM | |
| P0631 | VIN Not Programmed or Incompatible TCM | |
| P0632 | Odometer Not Programmed ECM/PCM | |
| P0633 | Immobilizer Key Not Programmed ECM/PCM | |
| P0634 | Control Module Internal Temperature A Too High | |
| P0635 | Power Steering Control Circuit | |
| P0636 | Power Steering Control Circuit Low | |
| P0637 | Power Steering Control Circuit High | |
| P0638 | Throttle Actuator Control Range/Performance Bank 1 | 5 |
| P0639 | Throttle Actuator Control Range/Performance Bank 2 | |
| P063A | Generator Voltage Sense Circuit A | |
| P063B | Generator Voltage Sense Circuit A Range/Performance | |
| P063C | Generator Voltage Sense Circuit A Low | |
| P063D | Generator Voltage Sense Circuit A High | |
| P063E | Auto Configuration Throttle Input Not Present Bank 1 | |
| P063F | Auto Configuration Engine Coolant Temperature Input Not Present | |
| P0640 | Intake Air Heater Control Circuit | |
| P0641 | Sensor Reference Voltage A Circuit/Open | |
| P0642 | Sensor Reference Voltage A Circuit Low | |
| P0643 | Sensor Reference Voltage A Circuit High | |
| P0644 | Driver Display Serial Communication Circuit | |
| P0645 | A/C Clutch Relay Control Circuit | |
| P0646 | A/C Clutch Relay Control Circuit Low | |
| P0647 | A/C Clutch Relay Control Circuit High | |
| P0648 | Immobilizer Lamp Control Circuit | |
| P0649 | Speed Control Lamp Control Circuit | |
| P064A | Fuel Pump Control Module A | 3 |
| P064B | PTO Control Module | |
| P064C | Glow Plug Control Module 1 | |
| P064D | Internal Control Module O2 Sensor Processor Performance Bank 1 | |
| P064E | Internal Control Module O2 Sensor Processor Performance Bank 2 | |
| P064F | Unauthorized Software/Calibration Detected | |
| P0650 | MIL Control Circuit/Open | |
| P0651 | Sensor Reference Voltage B Circuit/Open | 1 |
| P0652 | Sensor Reference Voltage B Circuit Low | |
| P0653 | Sensor Reference Voltage B Circuit High | 1 |
| P0654 | Engine RPM Output Circuit/Open | |
| P0655 | Engine Hot Lamp Output Control Circuit | |
| P0656 | Fuel Level Output Circuit | |
| P0657 | Actuator Supply Voltage A Circuit/Open | |
| P0658 | Actuator Supply Voltage A Circuit Low | |
| P0659 | Actuator Supply Voltage A Circuit High | |
| P065A | Generator System Performance | |
| P065B | Generator A Control Circuit Range/Performance | |
| P065C | Generator A Mechanical Performance | |
| P065D | Reductant System Malfunction Lamp Control Circuit | |
| P065E | Intake Manifold Tuning Valve Performance Bank 1 | |
| P065F | Intake Manifold Tuning Valve Performance Bank 2 | |
| P0660 | Intake Manifold Tuning Valve Control Circuit/Open Bank 1 | |
| P0661 | Intake Manifold Tuning Valve Control Circuit Low Bank 1 | 1 |
| P0662 | Intake Manifold Tuning Valve Control Circuit High Bank 1 | |
| P0663 | Intake Manifold Tuning Valve Control Circuit/Open Bank 2 | |
| P0664 | Intake Manifold Tuning Valve Control Circuit Low Bank 2 | |
| P0665 | Intake Manifold Tuning Valve Control Circuit High Bank 2 | |
| P0666 | Control Module Internal Temperature Sensor A Circuit | |
| P0667 | Control Module Internal Temperature Sensor A Range/Performance | |
| P0668 | Control Module Internal Temperature Sensor A Circuit Low | |
| P0669 | Control Module Internal Temperature Sensor A Circuit High | |
| P066A | Cylinder 1 Glow Plug Control Circuit Low | |
| P066B | Cylinder 1 Glow Plug Control Circuit High | |
| P066C | Cylinder 2 Glow Plug Control Circuit Low | |
| P066D | Cylinder 2 Glow Plug Control Circuit High | |
| P066E | Cylinder 3 Glow Plug Control Circuit Low | |
| P066F | Cylinder 3 Glow Plug Control Circuit High | |
| P0670 | Glow Plug Control Module 1 Control Circuit/Open | |
| P0671 | Cylinder 1 Glow Plug Circuit/Open | 1 |
| P0672 | Cylinder 2 Glow Plug Circuit/Open | |
| P0673 | Cylinder 3 Glow Plug Circuit/Open | |
| P0674 | Cylinder 4 Glow Plug Circuit/Open | 1 |
| P0675 | Cylinder 5 Glow Plug Circuit/Open | |
| P0676 | Cylinder 6 Glow Plug Circuit/Open | |
| P0677 | Cylinder 7 Glow Plug Circuit/Open | |
| P0678 | Cylinder 8 Glow Plug Circuit/Open | |
| P0679 | Cylinder 9 Glow Plug Circuit/Open | |
| P067A | Cylinder 4 Glow Plug Control Circuit Low | |
| P067B | Cylinder 4 Glow Plug Control Circuit High | |
| P067C | Cylinder 5 Glow Plug Control Circuit Low | |
| P067D | Cylinder 5 Glow Plug Control Circuit High | |
| P067E | Cylinder 6 Glow Plug Control Circuit Low | |
| P067F | Cylinder 6 Glow Plug Control Circuit High | |
| P0680 | Cylinder 10 Glow Plug Circuit/Open | |
| P0681 | Cylinder 11 Glow Plug Circuit/Open | |
| P0682 | Cylinder 12 Glow Plug Circuit/Open | |
| P0683 | Glow Plug Control Module 1 to PCM Communication Circuit | |
| P0684 | Glow Plug Control Module 1 to PCM Communication Circuit Range/Performance | |
| P0685 | ECM/PCM Power Relay Control Circuit/Open | |
| P0686 | ECM/PCM Power Relay Control Circuit Low | |
| P0687 | ECM/PCM Power Relay Control Circuit High | |
| P0688 | ECM/PCM Power Relay Sense Circuit/Open | |
| P0689 | ECM/PCM Power Relay Sense Circuit Low | |
| P068A | ECM/PCM Power Relay De-Energized Performance Too Early | 5 |
| P068B | ECM/PCM Power Relay De-Energized Performance Too Late | |
| P068C | Cylinder 7 Glow Plug Control Circuit Low | |
| P068D | Cylinder 7 Glow Plug Control Circuit High | |
| P068E | Cylinder 8 Glow Plug Control Circuit Low | |
| P068F | Cylinder 8 Glow Plug Control Circuit High | |
| P0690 | ECM/PCM Power Relay Sense Circuit High | |
| P0691 | Fan 1 Control Circuit Low | |
| P0692 | Fan 1 Control Circuit High | |
| P0693 | Fan 2 Control Circuit Low | |
| P0694 | Fan 2 Control Circuit High | |
| P0695 | Fan 3 Control Circuit Low | |
| P0696 | Fan 3 Control Circuit High | |
| P0697 | Sensor Reference Voltage C Circuit/Open | |
| P0698 | Sensor Reference Voltage C Circuit Low | |
| P0699 | Sensor Reference Voltage C Circuit High | |
| P069A | Cylinder 9 Glow Plug Control Circuit Low | |
| P069B | Cylinder 9 Glow Plug Control Circuit High | |
| P069C | Cylinder 10 Glow Plug Control Circuit Low | |
| P069D | Cylinder 10 Glow Plug Control Circuit High | |
| P069E | Fuel Pump Control Module Requested MIL Illumination | |
| P069F | Throttle Actuator Control Lamp Control Circuit | |
| P06A0 | Variable A/C Compressor Control Circuit | |
| P06A1 | Variable A/C Compressor Control Circuit Low | |
| P06A2 | Variable A/C Compressor Control Circuit High | |
| P06A3 | Sensor Reference Voltage D Circuit/Open | |
| P06A4 | Sensor Reference Voltage D Circuit Low | |
| P06A5 | Sensor Reference Voltage D Circuit High | |
| P06A6 | Sensor Reference Voltage A Circuit Range/Performance | |
| P06A7 | Sensor Reference Voltage B Circuit Range/Performance | 1 |
| P06A8 | Sensor Reference Voltage C Circuit Range/Performance | |
| P06A9 | Sensor Reference Voltage D Circuit Range/Performance | |
| P06AA | Control Module Internal Temperature B Too High | |
| P06AB | Control Module Internal Temperature Sensor B Circuit | |
| P06AC | Control Module Internal Temperature Sensor B Range/Performance | |
| P06AD | Control Module Internal Temperature Sensor B Circuit Low | |
| P06AE | Control Module Internal Temperature Sensor B Circuit High | |
| P06AF | Torque Management System Forced Engine Shutdown | |
| P06B0 | Sensor Power Supply A Circuit/Open | |
| P06B1 | Sensor Power Supply A Circuit Low | |
| P06B2 | Sensor Power Supply A Circuit High | |
| P06B3 | Sensor Power Supply B Circuit/Open | |
| P06B4 | Sensor Power Supply B Circuit Low | |
| P06B5 | Sensor Power Supply B Circuit High | |
| P06B6 | Internal Control Module Knock/Combustion Vibration Sensor Processor 1 Performance | |
| P06B7 | Internal Control Module Knock/Combustion Vibration Sensor Processor 2 Performance | |
| P06B8 | Internal Control Module Non-Volatile Random Access Memory (NVRAM) Error | |
| P06B9 | Cylinder 1 Glow Plug Circuit Range/Performance | |
| P06BA | Cylinder 2 Glow Plug Circuit Range/Performance | |
| P06BB | Cylinder 3 Glow Plug Circuit Range/Performance | |
| P06BC | Cylinder 4 Glow Plug Circuit Range/Performance | |
| P06BD | Cylinder 5 Glow Plug Circuit Range/Performance | |
| P06BE | Cylinder 6 Glow Plug Circuit Range/Performance | |
| P06BF | Cylinder 7 Glow Plug Circuit Range/Performance | |
| P06C0 | Cylinder 8 Glow Plug Circuit Range/Performance | |
| P06C1 | Cylinder 9 Glow Plug Circuit Range/Performance | |
| P06C2 | Cylinder 10 Glow Plug Circuit Range/Performance | |
| P06C3 | Cylinder 11 Glow Plug Circuit Range/Performance | |
| P06C4 | Cylinder 12 Glow Plug Circuit Range/Performance | |
| P06C5 | Cylinder 1 Glow Plug Incorrect | |
| P06C6 | Cylinder 2 Glow Plug Incorrect | |
| P06C7 | Cylinder 3 Glow Plug Incorrect | |
| P06C8 | Cylinder 4 Glow Plug Incorrect | |
| P06C9 | Cylinder 5 Glow Plug Incorrect | |
| P06CA | Cylinder 6 Glow Plug Incorrect | |
| P06CB | Cylinder 7 Glow Plug Incorrect | |
| P06CC | Cylinder 8 Glow Plug Incorrect | |
| P06CD | Cylinder 9 Glow Plug Incorrect | |
| P06CE | Cylinder 10 Glow Plug Incorrect | |
| P06CF | Cylinder 11 Glow Plug Incorrect | |
| P06D0 | Cylinder 12 Glow Plug Incorrect | |
| P06D1 | Internal Control Module Ignition Coil Control Performance | |
| P06D2 | Sensor Reference Voltage E Circuit/Open | |
| P06D3 | Sensor Reference Voltage E Circuit Low | |
| P06D4 | Sensor Reference Voltage E Circuit High | |
| P06D5 | Sensor Reference Voltage E Circuit Range/Performance | |
| P06D6 | Sensor Reference Voltage F Circuit/Open | |
| P06D7 | Sensor Reference Voltage F Circuit Low | |
| P06D8 | Sensor Reference Voltage F Circuit High | |
| P06D9 | Sensor Reference Voltage F Circuit Range/Performance | |
| P06DA | Engine Oil Pressure Control Circuit/Open | |
| P06DB | Engine Oil Pressure Control Circuit Low | |
| P06DC | Engine Oil Pressure Control Circuit High | |
| P06DD | Engine Oil Pressure Control Circuit Performance/Stuck Off | 1 |
| P06DE | Engine Oil Pressure Control Circuit Stuck On | |
| P06DF | Glow Plug Control Module 1 Memory Checksum Error | |
| P06E0 | Cylinder 11 Glow Plug Control Circuit Low | |
| P06E1 | Cylinder 11 Glow Plug Control Circuit High | |
| P06E2 | Cylinder 12 Glow Plug Control Circuit Low | |
| P06E3 | Cylinder 12 Glow Plug Control Circuit High | |
| P06E4 | Control Module Wake-up Circuit Performance | |
| P06E5 | Glow Plug Control Module 1 Performance | |
| P06E6 | Sensor Power Supply C Circuit/Open | |
| P06E7 | Sensor Power Supply C Circuit Low | |
| P06E8 | Sensor Power Supply C Circuit High | |
| P06E9 | Engine Starter Performance | 3 |
| P06EA | NOx Sensor Processor Performance Bank 1 Sensor 1 | |
| P06EB | NOx Sensor Processor Performance Bank 1 Sensor 2 | |
| P06EC | Fuel Injector Control Module Requested MIL Illumination | |
| P06ED | Engine RPM Output Circuit Low | |
| P06EE | Engine RPM Output Circuit High | |
| P06EF | Engine Restart Performance | 1 |
| P06F0 | Reductant Control Module Internal Temperature Sensor Circuit | |
| P06F1 | Reductant Control Module Internal Temperature Sensor Range/Performance | |
| P06F2 | Reductant Control Module Internal Temperature Sensor Circuit Low | |
| P06F3 | Reductant Control Module Internal Temperature Sensor Circuit High | |
| P06F4 | Stop-Start Mode Lamp Control Circuit | |
| P06F5 | Glow Plug Control Module 2 | |
| P06F6 | Glow Plug Control Module 2 Control Circuit/Open | |
| P06F7 | Glow Plug Control Module 2 Control Circuit Low | |
| P06F8 | Glow Plug Control Module 2 Control Circuit High | |
| P06F9 | Glow Plug Control Module 2 System Voltage | |
| P06FA | Glow Plug Control Module 2 Performance | |
| P06FB | Glow Plug Control Module 2 Memory Checksum Error | |
| P06FC | Glow Plug Control Module 2 to PCM Communication Circuit | |
| P06FD | Glow Plug Control Module 2 to PCM Communication Circuit Range/Performance | |
| P06FE | Cold Start Diesel Intake Air Flow Control Performance | |
| P06FF | Economy Mode Lamp Control Circuit |