P06xx codes: Computer (engine control module) and output circuits
256 powertrain trouble codes from P0600 to P06FF. They mostly involve the engine control module, glow plug control module, glow plug and glow plug wiring.
All P06xx codes
213 of these codes usually turn on the check engine light; 109 can often be fixed at home.
| Code | Meaning | Difficulty |
|---|---|---|
| P0600 | Serial Communication Link | Hard |
| P0601 | Internal Control Module Memory Checksum Error | Hard |
| P0602 | Control Module Programming Error | Medium |
| P0603 | Internal Control Module Keep Alive Memory (KAM) Error | Easy |
| P0604 | Internal Control Module Random Access Memory (RAM) Error | Hard |
| P0605 | Internal Control Module Read Only Memory (ROM) Error | Hard |
| P0606 | Control Module Processor | Hard |
| P0607 | Control Module Performance | Hard |
| P0608 | Control Module VSS Output A | Medium |
| P0609 | Control Module VSS Output B | Medium |
| P060A | Internal Control Module Monitoring Processor Performance | Hard |
| P060B | Internal Control Module A/D Processing Performance | Hard |
| P060C | Internal Control Module Main Processor Performance | Hard |
| P060D | Internal Control Module Accelerator Pedal Position Performance | Medium |
| P060E | Internal Control Module Throttle Position Performance | Medium |
| P060F | Internal Control Module Coolant Temperature Performance | Hard |
| P0610 | Control Module Vehicle Options Error | Medium |
| P0611 | Fuel Injector Control Module Performance | Hard |
| P0612 | Fuel Injector Control Module Relay Control | Medium |
| P0613 | TCM Processor | Medium |
| P0614 | ECM/TCM Incompatible | Medium |
| P0615 | Starter Relay A Circuit | Easy |
| P0616 | Starter Relay A Circuit Low | Easy |
| P0617 | Starter Relay A Circuit High | Easy |
| P0618 | Alternative Fuel Control Module KAM Error | Medium |
| P0619 | Alternative Fuel Control Module RAM/ROM Error | Hard |
| P061A | Internal Control Module Torque Performance | Hard |
| P061B | Internal Control Module Torque Calculation Performance | Hard |
| P061C | Internal Control Module Engine RPM Performance | Hard |
| P061D | Internal Control Module Engine Air Mass Performance | Hard |
| P061E | Internal Control Module Brake Signal Performance | Medium |
| P061F | Internal Control Module Throttle Actuator Controller Performance | Hard |
| P0620 | Generator Control Circuit | Medium |
| P0621 | Generator Lamp/L Terminal Circuit | Medium |
| P0622 | Generator Field/F Terminal Circuit | Medium |
| P0623 | Generator Lamp Control Circuit | Medium |
| P0624 | Fuel Cap Lamp Control Circuit | Easy |
| P0625 | Generator Field/F Terminal Circuit Low | Medium |
| P0626 | Generator Field/F Terminal Circuit High | Medium |
| P0627 | Fuel Pump A Control Circuit/Open | Medium |
| P0628 | Fuel Pump A Control Circuit Low | Medium |
| P0629 | Fuel Pump A Control Circuit High | Medium |
| P062A | Fuel Pump A Control Circuit Range/Performance | Medium |
| P062B | Internal Control Module Fuel Injector Control Performance | Hard |
| P062C | Internal Control Module Vehicle Speed Performance | Medium |
| P062D | Fuel Injector Driver Circuit Performance Bank 1 | Hard |
| P062E | Fuel Injector Driver Circuit Performance Bank 2 | Hard |
| P062F | Internal Control Module EEPROM Error | Medium |
| P0630 | VIN Not Programmed or Incompatible ECM/PCM | Medium |
| P0631 | VIN Not Programmed or Incompatible TCM | Medium |
| P0632 | Odometer Not Programmed ECM/PCM | Medium |
| P0633 | Immobilizer Key Not Programmed ECM/PCM | Medium |
| P0634 | Control Module Internal Temperature A Too High | Hard |
| P0635 | Power Steering Control Circuit | Medium |
| P0636 | Power Steering Control Circuit Low | Medium |
| P0637 | Power Steering Control Circuit High | Medium |
| P0638 | Throttle Actuator Control Range/Performance Bank 1 | Medium |
| P0639 | Throttle Actuator Control Range/Performance Bank 2 | Medium |
| P063A | Generator Voltage Sense Circuit A | Medium |
| P063B | Generator Voltage Sense Circuit A Range/Performance | Medium |
| P063C | Generator Voltage Sense Circuit A Low | Medium |
| P063D | Generator Voltage Sense Circuit A High | Medium |
| P063E | Auto Configuration Throttle Input Not Present Bank 1 | Medium |
| P063F | Auto Configuration Engine Coolant Temperature Input Not Present | Easy |
| P0640 | Intake Air Heater Control Circuit | Medium |
| P0641 | Sensor Reference Voltage A Circuit/Open | Medium |
| P0642 | Sensor Reference Voltage A Circuit Low | Medium |
| P0643 | Sensor Reference Voltage A Circuit High | Medium |
| P0644 | Driver Display Serial Communication Circuit | Medium |
| P0645 | A/C Clutch Relay Control Circuit | Easy |
| P0646 | A/C Clutch Relay Control Circuit Low | Easy |
| P0647 | A/C Clutch Relay Control Circuit High | Easy |
| P0648 | Immobilizer Lamp Control Circuit | Medium |
| P0649 | Speed Control Lamp Control Circuit | Medium |
| P064A | Fuel Pump Control Module A | Medium |
| P064B | PTO Control Module | Medium |
| P064C | Glow Plug Control Module 1 | Medium |
| P064D | Internal Control Module O2 Sensor Processor Performance Bank 1 | Hard |
| P064E | Internal Control Module O2 Sensor Processor Performance Bank 2 | Hard |
| P064F | Unauthorized Software/Calibration Detected | Medium |
| P0650 | MIL Control Circuit/Open | Medium |
| P0651 | Sensor Reference Voltage B Circuit/Open | Medium |
| P0652 | Sensor Reference Voltage B Circuit Low | Medium |
| P0653 | Sensor Reference Voltage B Circuit High | Medium |
| P0654 | Engine RPM Output Circuit/Open | Medium |
| P0655 | Engine Hot Lamp Output Control Circuit | Medium |
| P0656 | Fuel Level Output Circuit | Medium |
| P0657 | Actuator Supply Voltage A Circuit/Open | Hard |
| P0658 | Actuator Supply Voltage A Circuit Low | Hard |
| P0659 | Actuator Supply Voltage A Circuit High | Hard |
| P065A | Generator System Performance | Medium |
| P065B | Generator A Control Circuit Range/Performance | Medium |
| P065C | Generator A Mechanical Performance | Easy |
| P065D | Reductant System Malfunction Lamp Control Circuit | Medium |
| P065E | Intake Manifold Tuning Valve Performance Bank 1 | Medium |
| P065F | Intake Manifold Tuning Valve Performance Bank 2 | Medium |
| P0660 | Intake Manifold Tuning Valve Control Circuit/Open Bank 1 | Easy |
| P0661 | Intake Manifold Tuning Valve Control Circuit Low Bank 1 | Easy |
| P0662 | Intake Manifold Tuning Valve Control Circuit High Bank 1 | Easy |
| P0663 | Intake Manifold Tuning Valve Control Circuit/Open Bank 2 | Easy |
| P0664 | Intake Manifold Tuning Valve Control Circuit Low Bank 2 | Easy |
| P0665 | Intake Manifold Tuning Valve Control Circuit High Bank 2 | Easy |
| P0666 | Control Module Internal Temperature Sensor A Circuit | Hard |
| P0667 | Control Module Internal Temperature Sensor A Range/Performance | Hard |
| P0668 | Control Module Internal Temperature Sensor A Circuit Low | Hard |
| P0669 | Control Module Internal Temperature Sensor A Circuit High | Hard |
| P066A | Cylinder 1 Glow Plug Control Circuit Low | Medium |
| P066B | Cylinder 1 Glow Plug Control Circuit High | Medium |
| P066C | Cylinder 2 Glow Plug Control Circuit Low | Medium |
| P066D | Cylinder 2 Glow Plug Control Circuit High | Medium |
| P066E | Cylinder 3 Glow Plug Control Circuit Low | Medium |
| P066F | Cylinder 3 Glow Plug Control Circuit High | Medium |
| P0670 | Glow Plug Control Module 1 Control Circuit/Open | Medium |
| P0671 | Cylinder 1 Glow Plug Circuit/Open | Medium |
| P0672 | Cylinder 2 Glow Plug Circuit/Open | Medium |
| P0673 | Cylinder 3 Glow Plug Circuit/Open | Medium |
| P0674 | Cylinder 4 Glow Plug Circuit/Open | Medium |
| P0675 | Cylinder 5 Glow Plug Circuit/Open | Medium |
| P0676 | Cylinder 6 Glow Plug Circuit/Open | Medium |
| P0677 | Cylinder 7 Glow Plug Circuit/Open | Medium |
| P0678 | Cylinder 8 Glow Plug Circuit/Open | Medium |
| P0679 | Cylinder 9 Glow Plug Circuit/Open | Medium |
| P067A | Cylinder 4 Glow Plug Control Circuit Low | Medium |
| P067B | Cylinder 4 Glow Plug Control Circuit High | Medium |
| P067C | Cylinder 5 Glow Plug Control Circuit Low | Medium |
| P067D | Cylinder 5 Glow Plug Control Circuit High | Medium |
| P067E | Cylinder 6 Glow Plug Control Circuit Low | Medium |
| P067F | Cylinder 6 Glow Plug Control Circuit High | Medium |
| P0680 | Cylinder 10 Glow Plug Circuit/Open | Medium |
| P0681 | Cylinder 11 Glow Plug Circuit/Open | Medium |
| P0682 | Cylinder 12 Glow Plug Circuit/Open | Medium |
| P0683 | Glow Plug Control Module 1 to PCM Communication Circuit | Medium |
| P0684 | Glow Plug Control Module 1 to PCM Communication Circuit Range/Performance | Medium |
| P0685 | ECM/PCM Power Relay Control Circuit/Open | Medium |
| P0686 | ECM/PCM Power Relay Control Circuit Low | Medium |
| P0687 | ECM/PCM Power Relay Control Circuit High | Medium |
| P0688 | ECM/PCM Power Relay Sense Circuit/Open | Medium |
| P0689 | ECM/PCM Power Relay Sense Circuit Low | Easy |
| P068A | ECM/PCM Power Relay De-Energized Performance Too Early | Medium |
| P068B | ECM/PCM Power Relay De-Energized Performance Too Late | Easy |
| P068C | Cylinder 7 Glow Plug Control Circuit Low | Medium |
| P068D | Cylinder 7 Glow Plug Control Circuit High | Medium |
| P068E | Cylinder 8 Glow Plug Control Circuit Low | Medium |
| P068F | Cylinder 8 Glow Plug Control Circuit High | Medium |
| P0690 | ECM/PCM Power Relay Sense Circuit High | Easy |
| P0691 | Fan 1 Control Circuit Low | Easy |
| P0692 | Fan 1 Control Circuit High | Easy |
| P0693 | Fan 2 Control Circuit Low | Easy |
| P0694 | Fan 2 Control Circuit High | Easy |
| P0695 | Fan 3 Control Circuit Low | Easy |
| P0696 | Fan 3 Control Circuit High | Easy |
| P0697 | Sensor Reference Voltage C Circuit/Open | Medium |
| P0698 | Sensor Reference Voltage C Circuit Low | Medium |
| P0699 | Sensor Reference Voltage C Circuit High | Medium |
| P069A | Cylinder 9 Glow Plug Control Circuit Low | Medium |
| P069B | Cylinder 9 Glow Plug Control Circuit High | Medium |
| P069C | Cylinder 10 Glow Plug Control Circuit Low | Medium |
| P069D | Cylinder 10 Glow Plug Control Circuit High | Medium |
| P069E | Fuel Pump Control Module Requested MIL Illumination | Medium |
| P069F | Throttle Actuator Control Lamp Control Circuit | Medium |
| P06A0 | Variable A/C Compressor Control Circuit | Medium |
| P06A1 | Variable A/C Compressor Control Circuit Low | Medium |
| P06A2 | Variable A/C Compressor Control Circuit High | Medium |
| P06A3 | Sensor Reference Voltage D Circuit/Open | Medium |
| P06A4 | Sensor Reference Voltage D Circuit Low | Medium |
| P06A5 | Sensor Reference Voltage D Circuit High | Medium |
| P06A6 | Sensor Reference Voltage A Circuit Range/Performance | Medium |
| P06A7 | Sensor Reference Voltage B Circuit Range/Performance | Medium |
| P06A8 | Sensor Reference Voltage C Circuit Range/Performance | Medium |
| P06A9 | Sensor Reference Voltage D Circuit Range/Performance | Medium |
| P06AA | Control Module Internal Temperature B Too High | Hard |
| P06AB | Control Module Internal Temperature Sensor B Circuit | Hard |
| P06AC | Control Module Internal Temperature Sensor B Range/Performance | Hard |
| P06AD | Control Module Internal Temperature Sensor B Circuit Low | Hard |
| P06AE | Control Module Internal Temperature Sensor B Circuit High | Hard |
| P06AF | Torque Management System Forced Engine Shutdown | Hard |
| P06B0 | Sensor Power Supply A Circuit/Open | Hard |
| P06B1 | Sensor Power Supply A Circuit Low | Hard |
| P06B2 | Sensor Power Supply A Circuit High | Hard |
| P06B3 | Sensor Power Supply B Circuit/Open | Hard |
| P06B4 | Sensor Power Supply B Circuit Low | Hard |
| P06B5 | Sensor Power Supply B Circuit High | Hard |
| P06B6 | Internal Control Module Knock/Combustion Vibration Sensor Processor 1 Performance | Medium |
| P06B7 | Internal Control Module Knock/Combustion Vibration Sensor Processor 2 Performance | Medium |
| P06B8 | Internal Control Module Non-Volatile Random Access Memory (NVRAM) Error | Medium |
| P06B9 | Cylinder 1 Glow Plug Circuit Range/Performance | Medium |
| P06BA | Cylinder 2 Glow Plug Circuit Range/Performance | Medium |
| P06BB | Cylinder 3 Glow Plug Circuit Range/Performance | Medium |
| P06BC | Cylinder 4 Glow Plug Circuit Range/Performance | Medium |
| P06BD | Cylinder 5 Glow Plug Circuit Range/Performance | Medium |
| P06BE | Cylinder 6 Glow Plug Circuit Range/Performance | Medium |
| P06BF | Cylinder 7 Glow Plug Circuit Range/Performance | Medium |
| P06C0 | Cylinder 8 Glow Plug Circuit Range/Performance | Medium |
| P06C1 | Cylinder 9 Glow Plug Circuit Range/Performance | Medium |
| P06C2 | Cylinder 10 Glow Plug Circuit Range/Performance | Medium |
| P06C3 | Cylinder 11 Glow Plug Circuit Range/Performance | Medium |
| P06C4 | Cylinder 12 Glow Plug Circuit Range/Performance | Medium |
| P06C5 | Cylinder 1 Glow Plug Incorrect | Medium |
| P06C6 | Cylinder 2 Glow Plug Incorrect | Medium |
| P06C7 | Cylinder 3 Glow Plug Incorrect | Medium |
| P06C8 | Cylinder 4 Glow Plug Incorrect | Medium |
| P06C9 | Cylinder 5 Glow Plug Incorrect | Medium |
| P06CA | Cylinder 6 Glow Plug Incorrect | Medium |
| P06CB | Cylinder 7 Glow Plug Incorrect | Medium |
| P06CC | Cylinder 8 Glow Plug Incorrect | Medium |
| P06CD | Cylinder 9 Glow Plug Incorrect | Medium |
| P06CE | Cylinder 10 Glow Plug Incorrect | Medium |
| P06CF | Cylinder 11 Glow Plug Incorrect | Medium |
| P06D0 | Cylinder 12 Glow Plug Incorrect | Medium |
| P06D1 | Internal Control Module Ignition Coil Control Performance | Hard |
| P06D2 | Sensor Reference Voltage E Circuit/Open | Medium |
| P06D3 | Sensor Reference Voltage E Circuit Low | Medium |
| P06D4 | Sensor Reference Voltage E Circuit High | Medium |
| P06D5 | Sensor Reference Voltage E Circuit Range/Performance | Medium |
| P06D6 | Sensor Reference Voltage F Circuit/Open | Medium |
| P06D7 | Sensor Reference Voltage F Circuit Low | Medium |
| P06D8 | Sensor Reference Voltage F Circuit High | Medium |
| P06D9 | Sensor Reference Voltage F Circuit Range/Performance | Medium |
| P06DA | Engine Oil Pressure Control Circuit/Open | Medium |
| P06DB | Engine Oil Pressure Control Circuit Low | Medium |
| P06DC | Engine Oil Pressure Control Circuit High | Medium |
| P06DD | Engine Oil Pressure Control Circuit Performance/Stuck Off | Hard |
| P06DE | Engine Oil Pressure Control Circuit Stuck On | Hard |
| P06DF | Glow Plug Control Module 1 Memory Checksum Error | Medium |
| P06E0 | Cylinder 11 Glow Plug Control Circuit Low | Medium |
| P06E1 | Cylinder 11 Glow Plug Control Circuit High | Medium |
| P06E2 | Cylinder 12 Glow Plug Control Circuit Low | Medium |
| P06E3 | Cylinder 12 Glow Plug Control Circuit High | Medium |
| P06E4 | Control Module Wake-up Circuit Performance | Medium |
| P06E5 | Glow Plug Control Module 1 Performance | Medium |
| P06E6 | Sensor Power Supply C Circuit/Open | Medium |
| P06E7 | Sensor Power Supply C Circuit Low | Medium |
| P06E8 | Sensor Power Supply C Circuit High | Medium |
| P06E9 | Engine Starter Performance | Medium |
| P06EA | NOx Sensor Processor Performance Bank 1 Sensor 1 | Medium |
| P06EB | NOx Sensor Processor Performance Bank 1 Sensor 2 | Medium |
| P06EC | Fuel Injector Control Module Requested MIL Illumination | Medium |
| P06ED | Engine RPM Output Circuit Low | Medium |
| P06EE | Engine RPM Output Circuit High | Medium |
| P06EF | Engine Restart Performance | Medium |
| P06F0 | Reductant Control Module Internal Temperature Sensor Circuit | Hard |
| P06F1 | Reductant Control Module Internal Temperature Sensor Range/Performance | Hard |
| P06F2 | Reductant Control Module Internal Temperature Sensor Circuit Low | Hard |
| P06F3 | Reductant Control Module Internal Temperature Sensor Circuit High | Hard |
| P06F4 | Stop-Start Mode Lamp Control Circuit | Easy |
| P06F5 | Glow Plug Control Module 2 | Medium |
| P06F6 | Glow Plug Control Module 2 Control Circuit/Open | Medium |
| P06F7 | Glow Plug Control Module 2 Control Circuit Low | Medium |
| P06F8 | Glow Plug Control Module 2 Control Circuit High | Medium |
| P06F9 | Glow Plug Control Module 2 System Voltage | Medium |
| P06FA | Glow Plug Control Module 2 Performance | Medium |
| P06FB | Glow Plug Control Module 2 Memory Checksum Error | Medium |
| P06FC | Glow Plug Control Module 2 to PCM Communication Circuit | Medium |
| P06FD | Glow Plug Control Module 2 to PCM Communication Circuit Range/Performance | Medium |
| P06FE | Cold Start Diesel Intake Air Flow Control Performance | Medium |
| P06FF | Economy Mode Lamp Control Circuit | Easy |