Computer Codes
427 OBD-II diagnostic trouble codes in this category.
Showing page 2 of 5 (427 codes total)
| Code | Description | Subsystem | Severity |
|---|---|---|---|
| P0679 | Cylinder 9 Glow Plug Circuit/Open | ECM/PCM | High |
| P0680 | Cylinder 10 Glow Plug Circuit/Open | ECM/PCM | High |
| P0681 | Cylinder 11 Glow Plug Circuit/Open | ECM/PCM | High |
| P0682 | Cylinder 12 Glow Plug Circuit/Open | ECM/PCM | High |
| P0683 | Glow Plug Control Module 1 to PCM Communication Circuit | ECM/PCM | High |
| P0684 | Glow Plug Control Module 1 to PCM Communication Circuit Range/Performance | ECM/PCM | High |
| P0685 | ECM/PCM Power Relay Control Circuit/Open | ECM/PCM | High |
| P0686 | ECM/PCM Power Relay Control Circuit Low | ECM/PCM | High |
| P0687 | ECM/PCM Power Relay Control Circuit High | ECM/PCM | High |
| P0688 | ECM/PCM Power Relay Sense Circuit/Open | ECM/PCM | High |
| P0689 | ECM/PCM Power Relay Sense Circuit Low | ECM/PCM | High |
| P0690 | ECM/PCM Power Relay Sense Circuit High | ECM/PCM | High |
| P0691 | Fan 1 Control Circuit Low | ECM/PCM | High |
| P0692 | Fan 1 Control Circuit High | ECM/PCM | High |
| P0693 | Fan 2 Control Circuit Low | ECM/PCM | High |
| P0694 | Fan 2 Control Circuit High | ECM/PCM | High |
| P0695 | Fan 3 Control Circuit Low | ECM/PCM | High |
| P0696 | Fan 3 Control Circuit High | ECM/PCM | High |
| P0697 | Sensor Reference Voltage C Circuit/Open | Reference Voltage | High |
| P0698 | Sensor Reference Voltage C Circuit Low | Reference Voltage | High |
| P0699 | Sensor Reference Voltage C Circuit High | Reference Voltage | High |
| P06E2 | Cylinder 12 Glow Plug Control Circuit Low | ECM/PCM | High |
| P06E3 | Cylinder 12 Glow Plug Control Circuit High | Powertrain Control | Medium |
| P06E4 | Control Module Wake-up Circuit Performance | Powertrain Control | Medium |
| P06E5 | Glow Plug Control Module 1 Performance | Powertrain Control | Medium |
| P06E6 | Sensor Power Supply C Circuit/Open | Powertrain Control | Medium |
| P06E7 | Sensor Power Supply C Circuit Low | Powertrain Control | Medium |
| P06E8 | Sensor Power Supply C Circuit High | Powertrain Control | Medium |
| P06E9 | Engine Starter Performance | Powertrain Control | Medium |
| P07E4 | Unable to Engage Park | Powertrain Control | Medium |
| P07E5 | Unable to Engage Drive | Powertrain Control | Medium |
| P07E6 | Stuck in Park | Powertrain Control | Medium |
| P07E7 | Stuck in Drive | Powertrain Control | Medium |
| P1000 | Manufacturer Controlled DTC | Powertrain Control | Medium |
| P1101 | MAF Sensor Out Of Self Test Range./KOER Not Able To Complete KOER Aborted | Powertrain Control | Medium |
| P1131 | Lack Of HO2S Switch - Sensor Indicates Lean | Powertrain Control | Medium |
| P1133 | HO2S Insufficient Switching Sensor 1 | Powertrain Control | Medium |
| P1135 | Pedal Position Sensor A Circuit Intermittent | Powertrain Control | Medium |
| P1148 | Closed Loop Control Function Bank 1 | Powertrain Control | Medium |
| P1151 | Lack Of HO2S21 Switch - Sensor Indicates Lean | Powertrain Control | Medium |
| P1174 | Cam Sensor Fault | Powertrain Control | Medium |
| P1258 | Pedal Correlation PDS1 and PDS2 | Powertrain Control | Medium |
| P1259 | Immobilizer to PCM Signal Error | Powertrain Control | Medium |
| P1292 | CNG Pressure Sensor Voltage Too High (Dodge) | Charging System | Medium |
| P1293 | CNG Pressure Sensor Voltage Too Low (Dodge) | Charging System | Medium |
| P1298 | IDM Failure | Powertrain Control | Medium |
| P1299 | Cylinder Head Overtemperature Protection Active | Powertrain Control | Medium |
| P1345 | SGC (Cam Position) Sensor Circuit Malfunction/ Crankshaft Position - Camshaft Position Correlation | Powertrain Control | Medium |
| P1375 | 24X Reference Circuit High Voltage (Buick) | Charging System | Medium |
| P1389 | No Auto Shutdown (ASD) Relay Output Voltage At PCM (Dodge) | ECM/PCM | Medium |
| P1391 | Glow Plug Circuit Low Input (Bank #1) | Powertrain Control | Medium |
| P1399 | Glow Plug Circuit High Side, High Input | Powertrain Control | Medium |
| P1440 | Purge Valve Stuck Open | Powertrain Control | Medium |
| P1457 | Unable To Pull Vacuum In Tank | Powertrain Control | Medium |
| P1478 | Battery Temp Sensor Voltage Out Of Limit (Dodge) | Charging System | Medium |
| P1491 | Secondary Switch Solenoid Circuit Malfunction | Powertrain Control | Medium |
| P1492 | Battery Temperature Sensor Voltage Too High (Dodge) | Charging System | Medium |
| P1493 | Battery Temperature Sensor Voltage Too Low (Dodge) | Charging System | Medium |
| P1494 | SPCUT Solenoid Circuit Malfunction | Powertrain Control | Medium |
| P1516 | IMRC Input Error (Bank 1) | Powertrain Control | Medium |
| P1537 | A/C Request Circuit Low Voltage (Buick) | Charging System | Medium |
| P1538 | A/C request Circuit High Voltage (Buick) | Charging System | Medium |
| P1554 | Cruise Engaged Circuit High Voltage (Buick) | Charging System | Medium |
| P1573 | PCM/EBTCM Serial Data Circuit (Buick) | ECM/PCM | Medium |
| P1576 | BBV Sensor Circuit High Voltage (Buick) | Charging System | Medium |
| P1577 | BBV Sensor Circuit Low Voltage (Buick) | Charging System | Medium |
| P1582 | Cruise Direction Circuit Low Voltage (Buick) | Charging System | Medium |
| P1598 | A/C Pressure Sensor Voltage Too High (Dodge) | Charging System | Medium |
| P1600 | PCM Battery (Buick) | ECM/PCM | Medium |
| P1607 | ECM Internal Circuit Failure A (Acura) | ECM/PCM | Medium |
| P1608 | ECM Internal Circuit Failure B (Acura) | ECM/PCM | Medium |
| P1621 | PCM Memory Performance (Buick) | ECM/PCM | Medium |
| P1650 | Driver 2 Input High Voltage (Buick) | Charging System | Medium |
| P1658 | Starter Enable Relay Control Circuit (Buick) | Charging System | Medium |
| P1668 | PCM IDM Communications Error (Ford) | ECM/PCM | Medium |
| P1682 | P1684 | Powertrain Control | Medium |
| P1684 | Metering Oil Pump Position Sensor Circuit Malfunction | Powertrain Control | Medium |
| P1693 | Tachometer Circuit Low Voltage (Buick) | Charging System | Medium |
| P1698 | No CCD Messages Received From PCM (Chrysler) | ECM/PCM | Medium |
| P1760 | ECM Supply Voltage Interrupted (Buick) | ECM/PCM | Medium |
| P1762 | Governor Pressure Sensor Offset Improper Voltage (Chrysler) | Charging System | Medium |
| P1763 | Governor Pressure Sensor Voltage Too High (Chrysler) | Charging System | Medium |
| P1764 | Governor Pressure Sensor Voltage Too Low (Chrysler) | Charging System | Medium |
| P1794 | Battery Voltage Circuit (Jaguar) | Charging System | Medium |
| P1797 | CAN TCM ECM Circuit Malfunction (Jaguar) | ECM/PCM | Medium |
| P1831 | PC Solenoid Power Circuit Low Voltage (Buick) | Charging System | Medium |
| P1833 | A/T Solenoids Power Circuit Low Voltage (Buick) | Charging System | Medium |
| P1852 | Brake Band Apply Solenoid Low Voltage (Buick) | Charging System | Medium |
| P1853 | Brake Band Apply Solenoid High Voltage (Buick) | Charging System | Medium |
| P1890 | ECM Data Input Circuit (Buick) | ECM/PCM | Medium |
| P1893 | Engine Torque Signal Low Voltage (Buick) | Charging System | Medium |
| P1894 | Engine Torque Signal High Voltage (Buick) | Charging System | Medium |
| P1895 | TCM To ECM Torque Reduction Circuit (Buick) | ECM/PCM | Medium |
| P1903 | Kickdown Solenoid Circuit Low Voltage (Ford) | Charging System | Medium |
| P1904 | Kickdown Solenoid Circuit High Voltage (Ford) | Charging System | Medium |
| P1911 | VFS B Pressure Output Failed Low | Powertrain Control | Medium |
| P21E3 | Cylinder 4 Injector B Circuit High | Powertrain Control | Medium |
| P21E4 | Cylinder 5 Injector B Circuit Low | Powertrain Control | Medium |
| P21E5 | Cylinder 5 Injector B Circuit High | Powertrain Control | Medium |
| P21E6 | Cylinder 6 Injector B Circuit Low | Powertrain Control | Medium |
About Computer Codes
This page lists all 427 OBD-II diagnostic trouble codes classified under the Computer category. These codes are stored by your vehicle's onboard computer when a sensor detects a malfunction in the computer system. Each code begins with a letter indicating the system (P for Powertrain, B for Body, C for Chassis, U for Network) followed by four digits that identify the specific fault.
When your check engine light comes on, an OBD-II scanner reads these stored codes to help pinpoint the problem. Generic codes (where the second digit is 0) follow the SAE J2012 standard and mean the same thing on every vehicle. Manufacturer-specific codes (where the second digit is 1) may have different meanings depending on the vehicle brand.
Click any code in the table above to see its full description, possible causes, common symptoms, and step-by-step repair guidance. Use the search box to quickly find a specific code within this category.