Decoding the check engine light in your Honda Civic can feel like deciphering a secret language. Fortunately, the On-Board Diagnostics II (OBDII) system is designed to help you understand exactly what’s happening under the hood. This comprehensive guide provides a detailed list of OBDII codes specifically for Honda Civic models, helping you identify potential issues and take informed action.
Understanding OBDII Codes for Your Honda Civic
OBDII codes are standardized codes used by vehicle manufacturers to pinpoint problems within your car’s systems. When your Honda Civic’s check engine light illuminates, it signifies that the OBDII system has detected an issue. These codes, read using an OBDII scanner, are your first step towards diagnosing and resolving car trouble. This list is derived from official Honda service information to ensure accuracy and relevance for your Civic.
Comprehensive List of Honda Civic OBDII Codes
Below is an extensive list of OBDII trouble codes that may appear in your Honda Civic. This list includes codes related to various systems, from engine performance to emissions control and transmission issues.
P0000 – P0099: Fuel and Air Metering & Auxiliary Emission Controls
- P0010 Variable Valve Timing Control (VTC) Oil Control Solenoid Valve Malfunction
- P0011 Variable Valve Timing Control (VTC) System Malfunction
P0100 – P0199: Fuel and Air Metering
- P0101 Mass Airflow (MAF) Sensor Range/Performance Problem
- P0102 Mass Airflow (MAF) Sensor Circuit Low Voltage
- P0103 Mass Airflow (MAF) Sensor Circuit High Voltage
- P0106 Manifold Absolute Pressure (MAP) Sensor Range/Performance Problem
- P0107 Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage
- P0108 Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage
- P0111 Intake Air Temperature (IAT) Sensor Circuit Range/Performance Problem
- P0112 Intake Air Temperature (IAT) Sensor Circuit Low Voltage
- P0113 Intake Air Temperature (IAT) Sensor Circuit High Voltage
- P0116 Engine Coolant Temperature (ECT) Sensor Circuit Range/Performance Problem
- P0117 Engine Coolant Temperature (ECT) Sensor Circuit Low Input
- P0118 Engine Coolant Temperature (ECT) Sensor Circuit High Input
- P0122 Throttle Position (TP) Sensor Circuit Low Input
- P0123 Throttle Position (TP) Sensor Circuit High Input
- P0125 Engine Coolant Temperature (ECT) Sensor Slow Response
- P0128 Cooling System Malfunction
- P0131 Primary Heated Oxygen Sensor (Primary HO2S) (Sensor 1) Circuit Low Voltage
- P0132 Primary Heated Oxygen Sensor (Primary HO2S) (Sensor 1) Circuit High Voltage
- P0133 Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) Circuit Slow Response
- P0134 Air/Fuel Ratio (A/F) Sensor (Sensor 1) No Activity Detected
- P0135 Primary Heated Oxygen Sensor (Primary HO2S) (Sensor 1) Heater Circuit Malfunction
- P0137 Secondary Heated Oxygen Sensor (Secondary HO2S) Circuit Low Voltage
- P0138 Secondary Heated Oxygen Sensor (Secondary HO2S) Circuit High Voltage
- P0139 Secondary Heated Oxygen Sensor (Secondary HO2S) Slow Response
- P0141 Secondary Heated Oxygen Sensor (Secondary HO2S) (Sensor 2) Heater Circuit Malfunction
- P0143 Third Heated Oxygen Sensor (Third HO2S) (Sensor 3) Circuit Low Voltage
- P0144 Third Heated Oxygen Sensor (Third HO2S) (Sensor 3) Circuit High Voltage
- P0145 Third Heated Oxygen Sensor (Third HO2S) (Sensor 3) Circuit Slow Response
- P0147 Third Heated Oxygen Sensor (Third HO2S) (Sensor 3) Heater Circuit Malfunction
- P0153 Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Circuit Slow Response
- P0154 Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Heater System Malfunction
- P0155 Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Heater Circuit Malfunction
- P0157 Front Secondary Heated Oxygen Sensor (Secondary HO2S) (Bank 2, Sensor 2) Circuit Low Voltage
- P0158 Front Secondary Heated Oxygen Sensor (Secondary HO2S) (Bank 2, Sensor 2) Circuit High Voltage
- P0159 Front Secondary Heated Oxygen Sensor (Secondary HO2S) (Bank 2, Sensor 2) Circuit Slow Response
- P0161 Front Secondary Heated Oxygen Sensor (Secondary HO2S) (Bank 2, Sensor 2) Heater Circuit Malfunction
- P0171 Fuel System Too Lean
- P0172 Fuel System Too Rich
- P0174 Front Bank (Bank 2) Fuel System Too Lean
- P0175 Front Bank (Bank 2) Fuel System Too Rich
- P0191 Fuel Pressure Sensor Range/Performance Problem
- P0192 Fuel Pressure Sensor Circuit Low Voltage
- P0193 Fuel Pressure Sensor Circuit High Voltage
- P0196 EOT Sensor/Range Performance Problem
- P0197 EOT Sensor Circuit Low Voltage
- P0198 EOT Sensor Circuit High Voltage
P0200 – P0299: Fuel and Air Metering – Injector Circuit
- P0222 Throttle Position (TP) Sensor 2 Circuit Low Voltage
- P0223 Throttle Position (TP) Sensor 2 Circuit High Voltage
P0300 – P0399: Ignition System or Misfire
- P0300 Random Misfire
- P0301 No. 1 Cylinder Misfire
- P0302 No. 2 Cylinder Misfire
- P0303 No. 3 Cylinder Misfire
- P0304 No. 4 Cylinder Misfire
- P0305 No. 5 Cylinder Misfire
- P0306 No. 6 Cylinder Misfire
- P0325 Knock Sensor Circuit Malfunction
- P0335 Crankshaft Position (CKP) Sensor Circuit No Signal
- P0336 P0339 Crankshaft Position (CKP) Sensor Circuit Intermittent Interruption
- P0340 Camshaft Position (CMP) Sensor No Signal
- P0341 Camshaft Position (CMP) Sensor A Intermittent Interruption
- P0341 Variable Valve Timing Control (VTC) Phase Gap
- P0344 Camshaft Position (CMP) Sensor Intermittent Interruption
- P0365 Camshaft Position (CMP) Sensor B No Signal
- P0366 P0369 Camshaft Position (CMP) Sensor B Intermittent Interruption
- P0385 Crankshaft Position (CKP) Sensor B No Signal
- P0389 Crankshaft Position (CKP) Sensor B Intermittent Interruption
P0400 – P0499: Auxiliary Emission Controls
- P0401 Exhaust Gas Recirculation (EGR) Insufficient Flow
- P0404 Exhaust Gas Recirculation (EGR) Control Circuit Range/Performance Problem
- P0406 Exhaust Gas Recirculation (EGR) Valve Position Sensor Circuit High Voltage
- P0410 Air Pump Circuit Malfunction
- P0411 Secondary Air Injection System Incorrect Flow
- P0420 Catalyst System Efficiency Below Threshold
- P0430 Front Bank Catalyst System Efficiency Below Threshold (Bank 2)
- P0441 Evaporative Emission (EVAP) Control System Incorrect Purge Flow
- P0442 Evaporative Emission (EVAP) System Small Leak Detected
- P0443 Evaporative Emission (EVAP) Canister Purge Valve Circuit Malfunction
- P0451 Fuel Tank Pressure (FTP) Sensor Range/Performance Problem
- P0452 Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage
- P0453 Fuel Tank Pressure (FTP) Sensor Circuit High Voltage
- P0456 Evaporative Emission (EVAP) System Very Small Leak Detected
- P0457 Evaporative Emission (EVAP) System Leak Detected Fuel Fill Cap Loose/Off
- P0461 Fuel Gauge Sending Unit Range/Performance Problem
- P0462 Fuel Gauge Sending Unit Circuit Low Voltage
- P0463 Fuel Gauge Sending Unit Circuit High Voltage
- P0496 Evaporative Emission (EVAP) System High Purge Flow
- P0497 Evaporative Emission (EVAP) System Low Purge Flow
- P0498 Evaporative Emission (EVAP) Canister Vent Shut Valve Control Circuit Low Voltage
- P0499 Evaporative Emission (EVAP) Canister Vent Shut Valve Control Circuit High Voltage
P0500 – P0599: Vehicle Speed Controls & Idle Control System
- P0500 Vehicle Speed Sensor (VSS) Circuit Malfunction
- P0501 Vehicle Speed Sensor (VSS) Range/Peformance Problem
- P0505 Idle Control System Malfunction
- P0506 Idle Control System RPM Lower Than Expected
- P0507 Idle Control System RPM Higher Than Expected
- P0511 Idle Air Control (IAC) Valve Circuit Malfunction
P0520 – P0599: Pressure Control System
- P0521 EOP Sensor Range/Performance Problem
- P0522 EOP Sensor Circuit Low Voltage
- P0523 EOP Sensor Circuit High Voltage
P0600 – P0699: Computer Output Circuit Check
- P0560 ECM Back-up Circuit Low Voltage
- P0563 Engine Control Module (ECM)/Powertrain Control Module (PCM) Power Source Circuit Unexpected Voltage
- P0600 Multiplex Control System Troubleshooting
- P0603 ECM/PCM Internal Control Module Keep Alive Memory (KAM) Error
- P0606 ECM/PCM Processor Malfunction
- P0661 Intake Manifold Runner Control (IMRC) Valve Position Sensor Circuit Low Voltage
- P0662 Intake Manifold Runner Control (IMRC) Valve Position Sensor Circuit High Voltage
- P0685 ECM/PCM Power Relay Control Circuit Malfunction
P0700 – P0799: Transmission
- P0700 Automatic Transmission Control System
- P0705 Short in Transmission Range Switch Circuit (Multiple Shift-position Input)
- P0706 Open in Transmission Range Switch Circuit
- P0710 P0711 Problem in ATF Temperature Sensor Circuit
- P0712 Short in ATF Temperature Sensor Circuit
- P0713 Open in ATF Temperature Sensor Circuit
- P0715 P0716 Problem in Mainshaft Speed Sensor Circuit
- P0717 Problem in Mainshaft Speed Sensor Circuit (No Signal Input)
- P0718 Mainshaft Speed Sensor Intermittent Failure
- P0720 Countershaft Speed Sensor Circuit Malfunction
- P0720 P0721 Problem in Countershaft Speed Sensor Circuit
- P0722 Problem in Countershaft Speed Sensor Circuit (No Signal Input)
- P0723 Countershaft Speed Sensor Intermittent Failure
- P0725 Engine Speed Input Circuit Malfunction
- P0730 Problem in Shift Control System
- P0731 Problem in 1st Clutch and 1st Clutch Hydraulic Circuit
- P0732 Problem in 2nd Clutch and 2nd Clutch Hydraulic Circuit
- P0733 Problem in 3rd Clutch and 3rd Clutch Hydraulic Circuit
- P0734 Problem in 4th Clutch and 4th Clutch Hydraulic Clutch
- P0735 Problem in 5th Clutch and 5th Clutch Hydraulic Circuit
- P0740 Problem in Lock-up Control System
- P0741 Torque Converter Clutch Hydraulic Clutch Stuck OFF
- P0743 Problem in Torque Converter Clutch Solenoid Valve Circuit
- P0745 Problem in Hydraulic Control System of A/T Clutch Pressure Control Solenoid Valve A Circuit
- P0746 A/T Clutch Pressure Control Solenoid Valve A Stuck OFF
- P0747 A/T Clutch Pressure Control Solenoid Valve A Stuck ON
- P0748 Problem in A/T Clutch Pressure Control Solenoid Valve A Circuit
- P0750 Problem in Hydraulic Control System of Shift Solenoid Valve A Circuit
- P0751 Shift Solenoid Valve A Stuck OFF
- P0752 Shift Solenoid Valve A Stuck ON
- P0753 Problem in Shift Solenoid Valve A Circuit
- P0756 Shift Solenoid Valve B Stuck OFF
- P0757 Shift Solenoid Valve B Stuck ON
- P0758 Problem in Shift Solenoid Valve B Circuit
- P0761 Shift Solenoid Valve C Stuck OFF
- P0762 Shift Solenoid Valve C Stuck ON
- P0763 Problem in Shift Solenoid Valve C Circuit
- P0771 Shift Solenoid Valve E Stuck OFF
- P0773 Problem in Shift Solenoid Valve E Circuit
- P0775 Problem in the Hydraulic Control System of A/T Clutch Pressure Control Solenoid Valve B Circuit
- P0776 A/T Clutch Pressure Control Solenoid Valve B Stuck OFF
- P0777 A/T Clutch Pressure Control Solenoid Valve B Stuck ON
- P0778 Problem in A/T Clutch Pressure Control Solenoid Valve B Circuit
- P0780 Problem in Shift Control System
- P0795 Problem in Hydraulic Control System of A/T Clutch Pressure Control Solenoid Valve C Circuit
- P0796 A/T Clutch Pressure Control Solenoid Valve C Stuck OFF
- P0797 A/T Clutch Pressure Control Solenoid Valve C Stuck ON
- P0798 Problem in A/T Clutch Pressure Control Solenoid Valve C Ciruit
P0800 – P0899: Transmission
- P0812 Open in Transmission Range Switch ATP RVS Switch Circuit
- P0842 Short in 2nd Clutch Transmission Fluid Pressure Switch Clutch, or 2nd Clutch Transmission Fluid Pressure Switch (Clutch) Stuck ON
- P0843 Open in 2nd Clutch Transmission Fluid Pressure Switch Circuit, or 2nd Clutch Transmission Fluid Pressure Switch Stuck OFF
- P0845 Problem in 3rd Clutch Pressure Switch Circuit
- P0847 Short in 3rd Clutch Transmission Fluid Pressure Switch Circuit, or 3rd Clutch Transmission Fluid Pressure Switch Stuck ON
- P0848 Open in 3rd Clutch Transmission Fluid Pressure Switch Circuit, or 3rd Clutch Transmission Fluid Pressure Switch Stuck OFF
- P0872 Short in 4th Clutch Transmission Fluid Pressure Switch Circuit, or 4th Clutch Transmission Fluid Pressure Switch Stuck ON
- P0873 Open in 4th Clutch Transmission Fluid Pressure Switch Circuit, or 4th Clutch Transmission Fluid Pressure Switch Stuck OFF
- P0962 Problem in A/T Clutch Pressure Control Solenoid Valve A Circuit
- P0963 Problem in A/T Clutch Pressure Control Solenoid Valve A
- P0966 Problem in A/T Clutch Pressure Control Solenoid Valve B Circuit
- P0967 Problem in A/T Clutch Pressure Control Solenoid Valve B
- P0970 Problem in A/T Clutch Pressure Control Solenoid Valve C Circuit
- P0971 Problem in A/T Clutch Pressure Control Solenoid Valve C
- P0973 Short in Shift Solenoid Valve A Circuit
- P0974 Open in Shift Solenoid Valve A Circuit
- P0976 Short in Shift Solenoid Valve B Circuit
- P0977 Open in Shift Solenoid Valve B Circuit
- P0979 Short in Shift Solenoid Valve C Circuit
- P0980 Open in Shift Solenoid Valve C Circuit
- P0982 Short in Shift Solenoid Valve D Circuit
- P0983 Open in Shift Solenoid Valve D Circuit
- P0985 Short in Shift Solenoid Valve E Circuit
- P0986 Open in Shift Solenoid Valve E Circuit
P1000 – P1099: Fuel and Air Metering & Idle Control System
- P1020 Valve Pause System Stuck Off
- P1021 Valve Pause System Stuck On
- P1025 Valve Pause System Sticking Off
- P1026 Valve Pause System Sticking On
- P1077 Intake Manifold Runner Control (IMRC) System Malfunction (Low rpm)
- P1078 Intake Mainfold Runner Control (IMRC) System Malfunction (High rpm)
P1100 – P1199: Fuel and Air Metering
- P1106 Barometric Pressure (BARO) Sensor Circuit Range/Performance Problem
- P1107 Barometric Pressure (BARO) Sensor Circuit Low Voltage
- P1108 Barometric Pressure (BARO) Sensor Circuit High Voltage
- P1121 Throttle Position (TP) Sensor Lower Than Expected
- P1122 Throttle Position (TP) Sensor Higher Than Expected
- P1128 Manifold Absolute Pressure (MAP) Sensor Circuit Lower Than Expected
- P1129 Manifold Absolute Pressure (MAP) Sensor Circuit Higher Than Expected
- P1130 Demand for Changing Both Secondary Heated Oxygen Sensor (Secondary HO2S) (Sensor 2) and Third Heated Oxygen Sensor (Third HO2S) (Sensor 3)
- P1149 Air/Fuel Ratio (A/F) Sensor (Sensor 1) Range/Performance Problem
- P1149 Air/Fuel Ratio Sensor (Sensor 1) Circuit Lean Range
- P1157 Air/Fuel Ratio (A/F) Sensor (Sensor 1) AFS Line High Voltage
- P1157 Air/Fuel Ratio (A/F) Sensor (Sensor 1) Circuit High Voltage
- P1157 Air/Fuel Ratio (A/F) Sensor (Sensor 1) Range/Performance Problem
- P1158 Air/Fuel Ratio (A/F) Sensor (Sensor 1) AFS- Terminal Low Voltage
- P1159 Air/Fuel Ratio (A/F) Sensor (Sensor 1) AFS+ Terminal Low Voltage
- P1162 Air/Fuel Ratio (A/F) Sensor (Sensor 1) Slow Response
- P1163 Air/Fuel Ratio (A/F) Sensor (Sensor 1) Slow Response
- P1163 Air/Fuel Ratio Sensor (Sensor 1) Slow Response
- P1164 Air/Fuel Ratio (A/F) Sensor (Sensor 1) Range/Performance Problem
- P1164 Air/Fuel Ratio (AF) Sensor (Sensor 1) Circuit Range/Performance
- P1165 Air/Fuel Ratio (A/F) Sensor (Sensor 1) Range/Performance Problem
- P1165 Air/Fuel Ratio Sensor (Sensor 1) Circuit Range/Performance
- P1166 Air/Fuel Ratio (A/F) Sensor (Sensor 1) Heater System Electrical Problem
- P1166 Heated Oxgen Sensor Sensor1 (Primary HO2S) Heater Circuit Malfunction
- P1167 Air/Fuel Ratio (A/F) Sensor (Sensor 1) Heater System Malfunction
- P1167 Heated Oxygen Sensor Sensor1 (Primary LAF HO2S) Heater System Malfunction
- P1168 Air/Fuel Ratio (A/F) Sensor (Sensor 1) LABEL Low Voltage
- P1169 Air/Fuel Ratio (A/F) Sensor (Sensor 1) LABEL High Voltage
- P1182 Fuel Temperature Sensor Circuit Low Voltage
- P1183 Fuel Temperature Sensor Circuit High Voltage
P1200 – P1299: Vehicle Speed, Idle Control, & Auxiliary Inputs
- P1253 P1259 VTEC System Malfunction
- P1297 Electric Load Detector (ELD) Circuit Low Voltage
- P1298 Electric Load Detector (ELD) Circuit High Voltage
P1300 – P1399: Ignition System or Misfire
- P1300 Random Misfire
- P1324 Knock Sensor Power Source Circuit Low Voltage
- P1336 Engine Speed (RPM) Fluctuation Sensor Intermittent Interruption
- P1337 Engine Speed (RPM) Fluctuation Sensor No Signal
- P1355 Front Ignition Coil Power Circuit Malfunction
- P1359 Crankshaft Position (CKP)/Top Dead Center (TDC) Sensor Circuit Malfunction
- P1361 Camshaft Position (CMP) Sensor A (Top Dead Center (TDC) Sensor) Intermittent Interruption
- P1361 Top Dead Center (TDC) Sensor Intermittent Interruption
- P1362 Camshaft Position (CMP) Sensor A (Top Dead Center (TDC) Sensor) No Signal
- P1362 Top Dead Center (TDC) Sensor No Signal
- P1366 Camshaft Position (CMP) Sensor B (Top Dead Center (TDC) Sensor) Intermittent Interruption
- P1366 Top Dead Center (TDC) Sensor 2 Intermittent Interruption
- P1367 Camshaft Position (CMP) Sensor B (Top Dead Center (TDC) Sensor) No Signal
- P1367 Top Dear Center (TDC) Sensor 2 No Signal
- P1381 Cylinder Position (CYP) Sensor Intermittent Interruption
- P1382 Cylinder Position (CYP) Sensor No Signal
P1400 – P1499: Auxiliary Emission Controls
- P1410 Air Pump Malfunction
- P1415 Air Pump Electric Current Sensor Circuit Low Voltage
- P1416 Air Pump Electric Current Sensor Circuit High Voltage
- P1420 Nox Adsorptive Catalyst System Efficiency Below Threshold
- P1438 Motor Drive Module (MDM) Overheating Signal Circuit
- P1438 Motor Drive Module (MDM) Overheating
- P1439 Motor Drive Module (MDM) Short Circuit Sensor Problem
- P1439 Motor Drive Module (MDM) Short Circuit
- P1440 IMA System Problem
- P1445 Bypass Control Problem
- P1448 P1449 Battery Module Overheating
- P1449 Battery Cell Overheating
- P1449 Battery Module Individual Voltage Input Deviation
- P1449 Battery Module Deterioration
- P1449 Battery Module Deviation
- P1454 Fuel Tank Pressure (FTP) Sensor Range/Performance Problem
- P1456 Evaporative Emissions (EVAP) Control System Leakage (Fuel Tank System)
- P1457 Evaporative Emissions (EVAP) Control System Leakage (EVAP Canister System)
- P1459 Evaporative Emission (EVAP) Purge Flow Switch Malfunction
- P1491 Exhaust Gas Recirculation (EGR) Valve Insufficient Lift
- P1486 Cooling System Malfunction
- P1491 Exhaust Gas Recirculation (EGR) Valve Insufficient Lift
- P1498 Exhaust Gas Recirculation (EGR) Valve Position Sensor Circuit High Voltage
P1500 – P1599: Idle Control System & Auxiliary Inputs
- P1505 Positive Crankcase Ventilation (PCV) Air Leakage
- P1508 P1519 Idle Air Control Valve (IACV) Circuit Malfunction
- P1509 Idle Air Control Valve (IACV) Circuit Failure
- P1522 Brake Booster Pressure Sensor Circuit Low Voltage
- P1523 Brake Booster Pressure Sensor Circuit High Voltage
- P1524 Brake Booster Pressure Sensor Range/Performance Problem
- P1541 Climate Control Unit Signal Circuit Low Voltage
- P1542 Climate Control Unit Signal Circuit High Voltage
- P1565 Motor Commutation Signal Problem
- P1568 Battery Module Individual Voltage Input Problem
- P1568 Battery Module Temperature Signal Circuit Problem
- P1568 Battery Cell Temperature Signal Circuit Problem
- P1572 Motor Drive Module (MDM) Temperature Signal Circuit Low Input
- P1572 Motor Drive Module (MDM) Temperature Signal Circuit High Input
- P1576 Motor Drive Module (MDM) Voltge Signal Circuit Low Input
- P1577 High Voltage Detection Signal Circuit Problem
- P1580 Battery Current Circuit Problem
- P1581 Motor Power Inverter (MPI) Module Current Signal Circuit Low Input
- P1581 Motor Power Inverter (MPI) Module Current Signal Circuit High Input
- P1581 Motor Power Inverter (MPI) Module Current Signal Circuit Problem
- P1582 Motor Current U Phase Signal Circuit Low Input
- P1582 Motor Current U Phase Signal Circuit High Input
- P1583 Motor Current V Phase Signal Circuit Low Input
- P1583 Motor Current V Phase Signal Circuit High Input
- P1584 Motor Current W Phase Signal Circuit Low Input
- P1584 Motor Current W Phase Signal Circuit High Input
- P1585 Motor Current Signal Circuit Problem
- P1586 Motor Power Inverter (MPI) Module Current Signal/Battery Current Signal Circuit Problem
P1600 – P1699: Transmission & Auxiliary Inputs
- P1607 Engine Control Module (ECM)/Powertrain Control Module (PCM) Internal Circuit Malfunction
- P1630 Transmission Control Module
- P1635 Battery Condition Monitor (BCM) Module Proble
- P1639 MOTB Signal Circuit Malfunction
- P1640 ACTTRQ Motor Torque Signal Circuit Low Input
- P1641 ACTTRQ Motor Torque Signal Circuit High Input
- P1642 QBATT Battery Signal Circuit Low Input
- P1643 QBATT Battery Signal Circuit High Input
- P1644 MOTFSA Signal Malfunction
- P1645 MOTFSB Signal Malfunction
- P1646 MOTSTB Signal Malfunction
- P1647 Power Command Signal Circuit Low Input
- P1647 Power Command Signal Circuit High Input
- P1647 Engine Torque Signal Circuit Low Input
- P1647 Engine Torque Signal Circuit High Input
- P1647 Mode Signal Circuit 1 Low Input
- P1647 Mode Signal Circuit 1 High Input
- P1647 Mode Signal Circuit 2 Problem
- P1647 Engine Speed Signal Circuit Problem
- P1648 Battery Condition Monitor (BCM) Module Communication Signal Circuit Problem
- P1648 Motor Control Module (MCM) Communication Signal Circuit Problem
- P1655 CVT-FI TMA/TMB Signal Line Failure
- P1656 Problem in PCM-toVTM-4 Control Unit Communications Circuit
- P1660 A/T-FI Data Line Failure/TCM – ECM Halt
- P1676 P1678 FPTDR Signal Line Failure
- P1679 RSCD Signal Circuit Malfunction
- P1681 A/T FI Signal A Cicuit Low Voltage
- P1682 A/T FI Signal A Circuit High Voltage
- P1683 Throttle Valve Default Position Spring Performance Problem
- P1684 Throttle Valve Return Spring Performance Problem
- P1686 A/T FI Signal B Circuit Low Voltage
- P1687 A/T FI Signal B Circuit High Voltage
P1700 – P1799: Transmission
- P1705 Short in Transmission Range Switch Circuit (More than one range position is on at the same time)
- P1706 Open in Transmission Range Switch Circuit
- P1709 Problem Transmission Gear Selection Switch Circuit
- P1730 Problem in Shift Control System: Shift Solenoid Valve A and D Stuck OFF Shift Solenoid Valve B Stuck ON Shift Valves A, B, and D Stuck
- P1731 Problem in Shift Control System: Shift Solenoid Valve E Stuck ON Shift Valve E Stuck A/T Clutch Pressure Control Solenoid Valve A Stuck OFF
- P1732 Problem in Shift Control System: Shift Solenoid Valve B and C Stuck ON Shift Valves B and C Stuck
- P1733 Problem in Shift Control System: Shift Solenoid Valve D Stuck ON Shift Valve D Stuck A/T Clutch Pressure Control Solenoid Valve C Stuck OFF
- P1734 Problem in Shift Control System: Shift Solenoid Valves B and C Stuck ON Shift Valves B and C Stuck
- P1738 Problem in 2nd Clutch Pressure Switch Circuit
- P1739 Problem in 3rd Clutch Pressure Switch Circuit
- P1740 Problem in 4th Clutch Pressure Switch Circuit
- P1750 Mechanical Problem in Hydraulic Control System of A/T Clutch Pressure Control Solenoid Valve Assemblies A and B, or Problem in the Hydraulic Control System
- P1751 Mechanical Problem in Hydraulic Control System of Shift Solenoid Valve B and A/T Clutch Pressure Control Solenoid Valves A and B, or Problem in the Hydraulic Control System
- P1753 Problem in Torque Converter Clutch Solenoid Valve Circuit
- P1751 P1768 Problem in Torque Converter Clutch Solenoid Valve B Circuit
- P1773 Problem in A/T Clutch Pressure Control Solenoid Valve B Circuit
- P1790 Throttle Position (TP) Sensor Circuit Malfunction
- P1791 Vehicle Speed Sensor (VSS) Range/Performance Problem
- P1792 Problem in Engine Coolant Temperature (ECT) Sensor Circuit
- P1793 Manifold Absolute Pressure Sensor Circuit
P1800 – P1899: Transmission
- P1870 Problem in CVT Speed Change Control Valve Assembly Circuit
- P1873 Problem in CVT Pulley Pressure Control Valve Assembly Circuit
- P1879 Problem in CVT Start Clutch Pressure Control Valve Assembly Circuit
- P1882 Problem in Inhibitor Solenoid Circuit
- P1884 Secondary Gear Speed Sensor 2 Circuit Malfunction
- P1885 CVT Drive Pulley Speed Sensor Circuit
- P1886 CVT Driven Pulley Speed Sensor Circuit
- P1888 CVT Speed Sensor
- P1889 Problem in CVT Speed Sensor 2 Circuit
- P1890 Shift Control System
- P1891 Problem in Start Clutch System
- P1894 CVT Speed Change Control Valve Circuit
- P1895 CVT Pulley Pressure Control Valve Circuit
P2100 – P2199: Throttle Actuator Control System
- P2101 Throttle Actuator System Malfunction
- P2108 Throttle Actuator Control Module Problem
- P2118 Throttle Actuator Current Range/Performance Problem
- P2122 Accelerator Pedal Position (APP) Sensor 1 (Throttle Position Sensor D) Circuit Low Voltage
- P2123 Accelerator Pedal Position (APP) Sensor 1 (Throttle Position Sensor D) Circuit High Voltage
- P2127 Accelerator Pedal Position (APP) Sensor 2 (Throttle Position Sensor E) Circuit Low Voltage
- P2128 Accelerator Pedal Position (APP) Sensor 2 (Throttle Position Sensor E) Circuit High Voltage
- P2135 Throttle Position (TP) Sensor 1/2 Incorrect Voltage Correlation
- P2138 Accelerator Pedal Position (APP) Sensor 1/2 (Throttle Position Sensor D/E) Incorrect Voltage Correlation
- P2176 Throttle Actuator Control System Idle Position Not Learned
- P2195 Air/Fuel Ratio (A/F) Sensor (Sensor 1) Signal Stuck Lean
- P2197 Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Signal Stuck Lean
P2200 – P2299: Fuel and Air Metering
- P2227 Barometric Pressure (BARO) Sensor Circuit Range/Performance Problem
- P2228 Barometric Pressure (BARO) Sensor Circuit Low Voltage
- P2229 Barometric Pressure (BARO) Sensor Circuit High Voltage
- P2237 Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) IP Line High Voltage
- P2238 Air/Fuel Ratio (A/F) Sensor (Sensor 1) AFS+ Line Low Voltage
- P2238 Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) IP Line Low Voltage
- P2240 Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) IP Line High Voltage
- P2241 Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) IP Line Low Voltage
- P2243 Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) VCENT Line High Voltage
- P2245 Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) VCENT Line Low Voltage
- P2247 Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) VCENT Line High Voltage
- P2249 Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) VCENT Line Low Voltage
- P2251 Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) VS Line High Voltage
- P2252 Air/Fuel Ratio (A/F) Sensor (Sensor 1) AFS- Line Low Voltage
- P2254 Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) VS Line High Voltage
- P2255 Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) VS Line Low Voltage
- P2279 Intake Air System Leak
P2400 – P2499: Auxiliary Emission Controls
- P2413 Exhaust Gas Recirculation (EGR) System Range/Performance Problem
- P2422 Evaporative Emission (EVAP) System Vent Shut Valve Close Malfunction
P2500 – P2599: Throttle Actuator Control System
- P2552 Throttle Actuator Control Module Relay Malfunction
P2600 – P2699: VTEC System & Fuel and Air Metering
- P2627 Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) LABEL Circuit Low Voltage
- P2628 Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) LABEL Circuit High Voltage
- P2630 Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) LABEL Circuit Low Voltage
- P2631 Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) LABEL Circuit High Voltage
- P2646 VTEC Oil Pressure Switch Circuit Low Voltage
- P2647 VTEC Oil Pressure Switch Circuit High Voltage
- P2648 VTEC Solenoid Valve Circuit Low Voltage
- P2649 VTEC Solenoid Valve Circuit High Voltage
P2700 – P2799: Transmission
- P2769 Short in Torque Converter Clutch Solenoid Valve Circuit
- P2770 Open in Torque Converter Clutch Solenoid Valve Circuit
P2A00 – P2A99: Fuel and Air Metering
- P2A00 Air/Fuel Ratio (A/F) Sensor (Sensor 1) Range/Performance Problem
- P2A03 Front A/F Sensor Circuit (Bank 2, Sensor 1) Circuit Range/Performance Problem
U0000 – U0099: Network Communication
- U0073 FCAN Malfunction (Bus-off)
U0100 – U0199: Lost Communication
- U0107 Lost Communication With Throttle Actuator Control Module
- U0121 FCAN Malfunction (TCS-PCM)
- U0155 FCAN Malfunction (Gauge Control Module-ECM/PCM)
Troubleshooting OBDII Codes on Your Honda Civic
This list is a valuable resource for understanding potential issues indicated by OBDII codes in your Honda Civic. When you encounter a check engine light and retrieve a code, this guide can help you:
- Identify the System: The code prefix (P0xxx, U0xxx) and the first two digits help categorize the affected system (Powertrain, Body, Chassis, Network Communication).
- Understand the Problem Area: The description provides a clear indication of the component or system experiencing a malfunction.
Important Next Steps:
- Use an OBDII Scanner: Invest in or borrow an OBDII scanner to read the codes yourself. Many affordable options are available.
- Research the Code: Use this list and online resources to understand the potential causes and symptoms related to your specific code.
- Visual Inspection: Often, a visual inspection of the affected system (wiring, sensors, hoses) can reveal obvious issues.
- Consult a Professional: For accurate diagnosis and repair, it’s always recommended to consult a certified mechanic. They have the expertise and tools to pinpoint the exact problem and perform the necessary repairs.
Disclaimer: This list is for informational purposes only and should not be used as a substitute for professional diagnosis and repair. Always consult a qualified mechanic for any vehicle issues.
