Decoding the mystery behind your Honda’s check engine light can be daunting, but understanding OBD2 codes is the first step to resolving car troubles. For 2000 Honda models and other OBD2-compliant vehicles, these codes provide crucial insights into potential issues. This guide offers a detailed list of OBD codes relevant to your 2000 Honda, helping you understand what your car is trying to tell you.
OBD2 (On-Board Diagnostics II) is a standardized system implemented in vehicles sold in the United States from 1996 onwards. It monitors various components of your car, including the engine, transmission, and emissions systems. When the system detects a problem, it triggers the check engine light and stores a corresponding Diagnostic Trouble Code (DTC). These codes are invaluable for diagnosing issues efficiently.
Below is a comprehensive list of OBD codes that may be applicable to your 2000 Honda and other similar models. While some codes might be more specific to older OBD0 and OBD1 systems also found in some Honda vehicles around 2000, understanding the broader spectrum is helpful.
Honda OBD Code List (Including OBD0, OBD1 & OBD2 Relevant to 2000 Models)
- 0 – ECU: Faulty Engine Control Unit or ECU ROM. This indicates a problem with the car’s computer itself. Diagnostic Procedure
- 1 – O2A: Oxygen sensor #1 malfunction. This sensor measures the oxygen content in the exhaust gas.
- 2 – O2B: Oxygen sensor #2 malfunction. Similar to O2A, but usually located downstream of the catalytic converter.
- 3 – MAP: Manifold Absolute Pressure sensor issue. The MAP sensor measures pressure within the intake manifold.
- 4 – CKP: Crank Position Sensor problem. This sensor monitors the position and speed of the crankshaft.
- 5 – MAP: Manifold Absolute Pressure sensor issue (duplicate code, likely system variation).
- 6 – ECT: Engine Coolant Temperature sensor malfunction. This sensor measures the engine coolant temperature.
- 7 – TPS: Throttle Position Sensor problem. The TPS monitors the throttle valve’s position.
- 8 – TDC: Top Dead Center sensor issue. This sensor helps determine the top dead center position of the pistons.
- 9 – CYP: Cylinder sensor malfunction. This sensor identifies which cylinder is firing.
- 10 – IAT: Intake Air Temperature sensor problem. This sensor measures the temperature of the air entering the engine. Diagnostic Procedure
- 11 – Engine Overheating: Indicates the engine is running too hot.
- 12 – EGR: Exhaust Gas Recirculation lift valve malfunction. The EGR system reduces emissions by recirculating exhaust gases.
- 13 – BARO: Atmospheric Pressure Sensor problem. This sensor measures the atmospheric pressure.
- 14 – IAC (EACV): Idle Air Control Valve malfunction. The IAC valve controls the engine’s idle speed.
- 15 – Ignition Output Signal: Problem with the ignition output signal from the ECU.
- 16 – Fuel Injectors: Issue with the fuel injectors, which spray fuel into the engine cylinders.
- 17 – VSS: Vehicle Speed Sensor malfunction. This sensor measures the vehicle’s speed.
- 19 – Automatic Transmission Lockup Control Valve: Problem with the automatic transmission lockup control valve.
- 20 – ELD: Electrical Load Detector malfunction. The ELD monitors the electrical load on the system.
- 21 – VTEC Spool Solenoid Valve: Problem with the VTEC (Variable Valve Timing and Lift Electronic Control) spool solenoid valve.
- 22 – VTEC Pressure Valve: Issue with the VTEC pressure valve.
- 23 – Knock Sensor: Knock sensor malfunction. This sensor detects engine knocking or detonation.
- 30 – Automatic Transmission A Signal: Problem with automatic transmission signal A.
- 31 – Automatic Transmission B Signal: Problem with automatic transmission signal B.
- 36 – Traction Control: Traction control system issue (found on some JDM ECUs).
- 38 – Secondary VTEC Solenoid: Secondary VTEC solenoid issue on JDM 3-stage D15B Vtec ECUs (P2J).
- 41 – Primary Oxygen Sensor Heater: Problem with the primary oxygen sensor heater circuit.
- 43 – Fuel Supply System: Issue with the fuel supply system.
- 45 – Fuel System Too Rich or Lean: Indicates the fuel mixture is either too rich (too much fuel) or too lean (not enough fuel).
- 48 – LAF: Lean Air Fuel sensor malfunction.
- 54 – CKF: Crank Fluctuation Sensor problem.
- 58 – TDC Sensor #2: Top Dead Center sensor #2 issue.
- 61 – Primary Oxygen Sensor: Primary oxygen sensor malfunction.
- 63 – Secondary Oxygen Sensor Circuit: Secondary oxygen sensor circuit problem.
- 65 – Secondary Oxygen Sensor Heater Wire: Secondary oxygen sensor heater wire issue.
- 67 – Catalytic Converter: Catalytic converter efficiency below threshold.
- 71 – Random Misfire Cylinder 1: Random misfire detected in cylinder 1.
- 72 – Random Misfire Cylinder 2: Random misfire detected in cylinder 2.
- 73 – Random Misfire Cylinder 3: Random misfire detected in cylinder 3.
- 74 – Random Misfire Cylinder 4: Random misfire detected in cylinder 4.
- 80 – EGR Valve/Line: EGR Valve or Line issue.
- 86 – ECT Sensor – Cooling System: Engine Coolant Temperature sensor issue specifically related to the cooling system.
- 91 – Fuel Tank Pressure Sensor: Fuel tank pressure sensor malfunction.
- 92 – EVAP Solenoid/Valve/Vacuum Lines: Problem with the EVAP (Evaporative Emission Control System) solenoid, valve, or vacuum lines.
OBD1 TCU Codes (Transmission Control Unit) – Potentially Relevant to 2000 Honda Models
These codes relate specifically to the automatic transmission system and might be found in some 2000 Honda models that still utilize OBD1-style TCU diagnostics or bridge OBD1/OBD2 systems.
- 1 – Lock-up solenoid ‘A’ circuit: Lock-up solenoid ‘A’ circuit open or shorted.
- 2 – Lock-up solenoid ‘B’ circuit: Lock-up solenoid ‘B’ circuit open or shorted.
- 3 – Throttle Position Sensor circuit: Throttle Position Sensor circuit open or shorted (TCU related).
- 4 – Vehicle Speed Sensor: Vehicle Speed Sensor open or shorted – No signal from speedometer (TCU related).
- 5 – Shift Lever Position Switch circuit: Shift Lever Position Switch circuit shorted.
- 6 – Shift Lever Position Switch circuit: Shift Lever Position Switch circuit open.
- 7 – Shift Solenoid ‘A’ circuit: Shift Solenoid ‘A’ circuit open or shorted.
- 8 – Shift Solenoid ‘B’ circuit: Shift Solenoid ‘B’ circuit open or shorted.
- 9 – Counter shaft speed pulse generator: Counter shaft or transmission speed pulse generator open or shorted.
- 10 – Coolant Temperature Sensor: Coolant Temperature Sensor open or shorted (TCU related).
- 11 – Engine RPM (Ignition coil signal): Engine RPM (Ignition coil signal) open or shorted (TCU related).
- 13 – Main shaft speed pulse generator: Main shaft speed pulse generator open or shorted.
- 14 – Linear solenoid: Linear (line pressure control) solenoid open or shorted.
- 15 – Kick down switch circuit: Kick down switch circuit shorted.
Diagnosing Your 2000 Honda with OBD2 Codes
When your “check engine light” illuminates in your 2000 Honda, the first step is to retrieve the stored OBD2 code. This requires an OBD2 scanner, readily available at auto parts stores or online. Simply plug the scanner into the OBD2 port, usually located under the dashboard on the driver’s side. Follow the scanner’s instructions to read the codes.
Once you have the code, consult this list or a more detailed repair manual to understand the potential issue. Remember that a code indicates a system or component that is experiencing a problem, but it does not always pinpoint the exact failed part. Further diagnosis is often needed.
This guide provides a starting point for understanding 2000 Honda Obd2 Codes. For accurate diagnosis and repair, always consult a qualified mechanic. This information is for educational purposes and should not replace professional automotive service.
