| P0600 | Serial Communication Link | Medium |
| P0601 | Internal Control Module Memory Checksum Error | High |
| P0602 | Control Module Programming Error | Medium |
| P0603 | Internal Control Module Keep Alive Memory (KAM) Error | Medium |
| P0604 | Internal Control Module Random Access Memory (RAM) Error | Medium |
| P0605 | Internal Control Module Read Only Memory (ROM) Error | High |
| P0606 | ECM/PCM Processor Fault | High |
| P0607 | Control Module Performance | Medium |
| P0608 | Control Module VSS Output 'A' | Medium |
| P0609 | Control Module VSS Output 'B' | Medium |
| P0610 | Control Module Vehicle Options Error | Medium |
| P0611 | Fuel Injector Control Module Performance | Medium |
| P0612 | Fuel Injector Control Module Relay Control | Medium |
| P0613 | TCM Processor | Medium |
| P0614 | ECM / TCM Incompatible | Medium |
| P0615 | Starter Relay Circuit | Medium |
| P0616 | Starter Relay Circuit Low | Medium |
| P0617 | Starter Relay Circuit High | Medium |
| P0618 | Alternative Fuel Control Module KAM Error | Medium |
| P0619 | Alternative Fuel Control Module RAM/ROM Error | Medium |
| P0620 | Generator Control Circuit | Medium |
| P0621 | Generator Lamp/L Terminal Circuit | Low |
| P0622 | Generator Field/F Terminal Circuit | Medium |
| P0623 | Generator Lamp Control Circuit | Low |
| P0624 | Fuel Cap Lamp Control Circuit | Low |
| 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 |
| 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 | PCM/ECM/TCM Internal Temperature Too High | Medium |
| 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 | Medium |
| P0639 | Throttle Actuator Control Range/Performance | Medium |
| 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 | Medium |
| P0646 | A/C Clutch Relay Control Circuit Low | Medium |
| P0647 | A/C Clutch Relay Control Circuit High | Medium |
| P0648 | Immobilizer Lamp Control Circuit | Low |
| P0649 | Speed Control Lamp Control Circuit | Low |
| P0650 | Malfunction Indicator Lamp (MIL) Control Circuit | Low |
| 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 | Medium |
| P0655 | Engine Hot Lamp Output Control Circuit | Low |
| P0656 | Fuel Level Output Circuit | Medium |
| P0657 | Actuator Supply Voltage 'A' Circuit/Open | Medium |
| P0658 | Actuator Supply Voltage 'A' Circuit Low | Medium |
| P0659 | Actuator Supply Voltage 'A' Circuit High | Medium |
| P0660 | Intake Manifold Tuning Valve Control Circuit/Open | Medium |
| P0661 | Intake Manifold Tuning Valve Control Circuit Low | Medium |
| P0662 | Intake Manifold Tuning Valve Control Circuit High | Medium |
| P0663 | Intake Manifold Tuning Valve Control Circuit/Open | Medium |
| P0664 | Intake Manifold Tuning Valve Control Circuit Low | Medium |
| P0665 | Intake Manifold Tuning Valve Control Circuit High | Medium |
| P0666 | PCM/ECM/TCM Internal Temperature Sensor Circuit | Medium |
| P0667 | PCM/ECM/TCM Internal Temperature Sensor Range/Performance | Medium |
| P0668 | PCM/ECM/TCM Internal Temperature Sensor Circuit Low | Medium |
| P0669 | PCM/ECM/TCM Internal Temperature Sensor Circuit High | Medium |
| P0670 | Glow Plug Module Control Circuit | Medium |
| P0671 | Cylinder 1 Glow Plug Circuit | Medium |
| P0672 | Cylinder 2 Glow Plug Circuit | Medium |
| P0673 | Cylinder 3 Glow Plug Circuit | Medium |
| P0674 | Cylinder 4 Glow Plug Circuit | Medium |
| P0675 | Cylinder 5 Glow Plug Circuit | Medium |
| P0676 | Cylinder 6 Glow Plug Circuit | Medium |
| P0677 | Cylinder 7 Glow Plug Circuit | Medium |
| P0678 | Cylinder 8 Glow Plug Circuit | Medium |
| P0679 | Cylinder 9 Glow Plug Circuit | Medium |
| P0680 | Cylinder 10 Glow Plug Circuit | Medium |
| P0681 | Cylinder 11 Glow Plug Circuit | Medium |
| P0682 | Cylinder 12 Glow Plug Circuit | Medium |
| P0683 | Glow Plug Control Module to PCM Communication Circuit | Medium |
| P0684 | Glow Plug Control Module 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 | Medium |
| P0690 | ECM/PCM Power Relay Sense Circuit High | Medium |
| P0691 | Fan 1 Control Circuit Low | Medium |
| P0692 | Fan 1 Control Circuit High | Medium |
| P0693 | Fan 2 Control Circuit Low | Medium |
| P0694 | Fan 2 Control Circuit High | Medium |
| P0695 | Fan 3 Control Circuit Low | Medium |
| P0696 | Fan 3 Control Circuit High | Medium |
| P0697 | Sensor Reference Voltage 'C' Circuit/Open | Medium |
| P0698 | Sensor Reference Voltage 'C' Circuit Low | Medium |
| P0699 | Sensor Reference Voltage 'C' Circuit High | Medium |