Honda OBD2 Codes List PDF: Your Comprehensive Guide to Error Codes

Understanding your Honda’s OBD2 codes is crucial for diagnosing and resolving car issues efficiently. This comprehensive guide provides an extensive Honda OBD2 codes list, helping you decipher those perplexing check engine lights and error messages. Whether you’re a seasoned mechanic or a Honda car owner, this resource will empower you to understand your vehicle’s diagnostic system.

Navigating the complexities of modern vehicle diagnostics can be daunting. The On-Board Diagnostics II (OBD2) system in your Honda is designed to monitor various components and systems, alerting you to potential problems through diagnostic trouble codes (DTCs). These codes, when read with an OBD2 scanner, can pinpoint the source of an issue, saving you time and money on unnecessary repairs.

This detailed Honda OBD2 codes list covers a wide range of potential problems, from engine and transmission issues to emission control and sensor malfunctions. Each code is listed with its description, providing you with a clear understanding of what the code signifies. While this list is extensive, it’s important to remember that proper diagnosis often requires further investigation and professional expertise.

This guide aims to be your go-to resource for Honda OBD2 codes. You can use this list to:

Quickly identify potential issues: When your check engine light illuminates, an OBD2 scanner will reveal a code. This list will help you immediately understand what that code means.
Prepare for mechanic visits: Knowing the OBD2 code beforehand allows you to communicate more effectively with your mechanic and understand the necessary repairs.
Perform preliminary troubleshooting: For DIY enthusiasts, understanding the codes can guide your initial troubleshooting steps.

Below is the comprehensive list of Honda OBD2 codes. Remember to always consult your Honda service manual and a qualified technician for accurate diagnosis and repair procedures.

Honda OBD2 Trouble Codes: P0000 – P0099 (Fuel and Air Metering and Auxiliary Emission Controls)

This section covers OBD2 codes ranging from P0010 to P0099, focusing on issues related to fuel and air metering, as well as auxiliary emission controls in Honda vehicles. Understanding these codes is essential for maintaining optimal engine performance and minimizing emissions.

P0010 Variable Valve Timing Control (VTC) Oil Control Solenoid Valve Malfunction: Indicates a problem with the VTC oil control solenoid valve circuit, which is crucial for regulating valve timing.
P0011 Variable Valve Timing Control (VTC) System Malfunction: Signals a malfunction within the VTC system, potentially affecting engine performance and fuel efficiency.

Alt text: A close-up view of a Variable Valve Timing Control (VTC) solenoid valve, a key component in Honda’s engine valve timing system.

P0101 Mass Airflow (MAF) Sensor Range/Performance Problem: Indicates the MAF sensor is not reading airflow within the expected range, affecting fuel delivery and potentially causing drivability issues.
P0102 Mass Airflow (MAF) Sensor Circuit Low Voltage: Signals a low voltage condition in the MAF sensor circuit, which could be due to wiring issues or a faulty sensor.
P0103 Mass Airflow (MAF) Sensor Circuit High Voltage: Indicates a high voltage condition in the MAF sensor circuit, potentially caused by a short circuit or sensor malfunction.

Alt text: Image of a Mass Air Flow (MAF) sensor, responsible for measuring the amount of air entering the Honda engine.

P0106 Manifold Absolute Pressure (MAP) Sensor Range/Performance Problem: Indicates the MAP sensor is not reading manifold pressure within the expected range, which can affect fuel and ignition timing.
P0107 Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage: Signals a low voltage issue in the MAP sensor circuit, possibly due to wiring problems or a faulty sensor.
P0108 Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage: Indicates a high voltage issue in the MAP sensor circuit, potentially caused by a short circuit or sensor failure.
P0111 Intake Air Temperature (IAT) Sensor Circuit Range/Performance Problem: Indicates the IAT sensor is not reading intake air temperature within the expected range, affecting fuel mixture calculations.
P0112 Intake Air Temperature (IAT) Sensor Circuit Low Voltage: Signals a low voltage condition in the IAT sensor circuit, possibly due to wiring issues or a faulty sensor.
P0113 Intake Air Temperature (IAT) Sensor Circuit High Voltage: Indicates a high voltage condition in the IAT sensor circuit, potentially caused by a short circuit or sensor failure.
P0116 Engine Coolant Temperature (ECT) Sensor Circuit Range/Performance Problem: Indicates the ECT sensor is not reading engine coolant temperature within the expected range, affecting engine management and cooling fan operation.
P0117 Engine Coolant Temperature (ECT) Sensor Circuit Low Input: Signals a low input condition in the ECT sensor circuit, possibly due to wiring issues or a faulty sensor.
P0118 Engine Coolant Temperature (ECT) Sensor Circuit High Input: Indicates a high input condition in the ECT sensor circuit, potentially caused by a short circuit or sensor failure.
P0122 Throttle Position (TP) Sensor Circuit Low Input: Signals a low input condition in the TP sensor circuit, indicating the throttle position reading is lower than expected.
P0123 Throttle Position (TP) Sensor Circuit High Input: Indicates a high input condition in the TP sensor circuit, indicating the throttle position reading is higher than expected.
P0125 Engine Coolant Temperature (ECT) Sensor Slow Response: Indicates the ECT sensor is responding slowly to temperature changes, potentially affecting engine control.
P0128 Cooling System Malfunction: Signals a general malfunction within the cooling system, which could be related to the thermostat, radiator, or other components.

Honda OBD2 Trouble Codes: P0130 – P0199 (Oxygen Sensors and Fuel System)

This section details Honda OBD2 codes from P0131 to P0199, focusing on oxygen sensor and fuel system related issues. These components are critical for emissions control and engine efficiency.

P0131 Primary Heated Oxygen Sensor (Primary HO2S) (Sensor 1) Circuit Low Voltage: Indicates a low voltage condition in the primary HO2S circuit (Bank 1, Sensor 1), suggesting a lean condition or sensor malfunction.
P0132 Primary Heated Oxygen Sensor (Primary HO2S) (Sensor 1) Circuit High Voltage: Indicates a high voltage condition in the primary HO2S circuit (Bank 1, Sensor 1), suggesting a rich condition or sensor malfunction.
P0133 Rear Air/Fuel Ratio (A/F) Sensor (Bank 1, Sensor 1) Circuit Slow Response: Indicates a slow response from the rear air/fuel ratio sensor (Bank 1, Sensor 1), potentially affecting fuel trim adjustments.
P0134 Air/Fuel Ratio (A/F) Sensor (Sensor 1) No Activity Detected: Indicates no activity detected from the air/fuel ratio sensor (Sensor 1), suggesting a sensor failure or circuit issue.
P0135 Primary Heated Oxygen Sensor (Primary HO2S) (Sensor 1) Heater Circuit Malfunction: Signals a malfunction in the heater circuit of the primary HO2S (Sensor 1), affecting sensor warm-up and accuracy.
P0137 Secondary Heated Oxygen Sensor (Secondary HO2S) Circuit Low Voltage: Indicates a low voltage condition in the secondary HO2S circuit (Sensor 2), suggesting a lean condition or sensor malfunction.
P0138 Secondary Heated Oxygen Sensor (Secondary HO2S) Circuit High Voltage: Indicates a high voltage condition in the secondary HO2S circuit (Sensor 2), suggesting a rich condition or sensor malfunction.
P0139 Secondary Heated Oxygen Sensor (Secondary HO2S) Slow Response: Indicates a slow response from the secondary HO2S (Sensor 2), potentially affecting catalyst efficiency monitoring.
P0141 Secondary Heated Oxygen Sensor (Secondary HO2S) (Sensor 2) Heater Circuit Malfunction: Signals a malfunction in the heater circuit of the secondary HO2S (Sensor 2), affecting sensor warm-up and accuracy.
P0143 Third Heated Oxygen Sensor (Third HO2S) (Sensor 3) Circuit Low Voltage: Indicates a low voltage condition in the third HO2S circuit (Sensor 3), suggesting a lean condition or sensor malfunction.
P0144 Third Heated Oxygen Sensor (Third HO2S) (Sensor 3) Circuit High Voltage: Indicates a high voltage condition in the third HO2S circuit (Sensor 3), suggesting a rich condition or sensor malfunction.
P0145 Third Heated Oxygen Sensor (Third HO2S) (Sensor 3) Circuit Slow Response: Indicates a slow response from the third HO2S (Sensor 3), potentially affecting catalyst efficiency monitoring.
P0147 Third Heated Oxygen Sensor (Third HO2S) (Sensor 3) Heater Circuit Malfunction: Signals a malfunction in the heater circuit of the third HO2S (Sensor 3), affecting sensor warm-up and accuracy.
P0153 Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Circuit Slow Response: Indicates a slow response from the front air/fuel ratio sensor (Bank 2, Sensor 1), potentially affecting fuel trim adjustments in Bank 2.
P0154 Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Heater System Malfunction: Signals a malfunction in the heater system of the front air/fuel ratio sensor (Bank 2, Sensor 1).
P0155 Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Heater Circuit Malfunction: Signals a malfunction in the heater circuit of the front air/fuel ratio sensor (Bank 2, Sensor 1).
P0157 Front Secondary Heated Oxygen Sensor (Secondary HO2S) (Bank 2, Sensor 2) Circuit Low Voltage: Indicates a low voltage condition in the front secondary HO2S circuit (Bank 2, Sensor 2), suggesting a lean condition or sensor malfunction.
P0158 Front Secondary Heated Oxygen Sensor (Secondary HO2S) (Bank 2, Sensor 2) Circuit High Voltage: Indicates a high voltage condition in the front secondary HO2S circuit (Bank 2, Sensor 2), suggesting a rich condition or sensor malfunction.
P0159 Front Secondary Heated Oxygen Sensor (Secondary HO2S) (Bank 2, Sensor 2) Circuit Slow Response: Indicates a slow response from the front secondary HO2S (Bank 2, Sensor 2), potentially affecting catalyst efficiency monitoring in Bank 2.
P0161 Front Secondary Heated Oxygen Sensor (Secondary HO2S) (Bank 2, Sensor 2) Heater Circuit Malfunction: Signals a malfunction in the heater circuit of the front secondary HO2S (Bank 2, Sensor 2).
P0171 Fuel System Too Lean: Indicates the fuel system is running lean, meaning there is too much air or not enough fuel in the air-fuel mixture.
P0172 Fuel System Too Rich: Indicates the fuel system is running rich, meaning there is too much fuel or not enough air in the air-fuel mixture.
P0174 Front Bank (Bank 2) Fuel System Too Lean: Indicates the fuel system in Bank 2 is running lean.
P0175 Front Bank (Bank 2) Fuel System Too Rich: Indicates the fuel system in Bank 2 is running rich.

Alt text: A typical oxygen sensor, used in Honda vehicles to monitor exhaust gas composition for optimal engine performance and emissions.

P0191 Fuel Pressure Sensor Range/Performance Problem: Indicates the fuel pressure sensor is not reading fuel pressure within the expected range.
P0192 Fuel Pressure Sensor Circuit Low Voltage: Signals a low voltage condition in the fuel pressure sensor circuit.
P0193 Fuel Pressure Sensor Circuit High Voltage: Signals a high voltage condition in the fuel pressure sensor circuit.
P0196 EOT Sensor/Range Performance Problem: Indicates a problem with the Engine Oil Temperature (EOT) sensor range or performance.
P0197 EOT Sensor Circuit Low Voltage: Signals a low voltage condition in the EOT sensor circuit.
P0198 EOT Sensor Circuit High Voltage: Signals a high voltage condition in the EOT sensor circuit.

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Honda OBD2 Trouble Codes: P0200 – P0299 (Injector Circuit and Misfire)

P0222 Throttle Position (TP) Sensor 2 Circuit Low Voltage
P0223 Throttle Position (TP) Sensor 2 Circuit High Voltage
P0300 Random Misfire Detected
P0301 Cylinder 1 Misfire Detected
P0302 Cylinder 2 Misfire Detected
P0303 Cylinder 3 Misfire Detected
P0304 Cylinder 4 Misfire Detected
P0305 Cylinder 5 Misfire Detected
P0306 Cylinder 6 Misfire Detected

Alt text: Illustration depicting an engine misfire, a common issue indicated by Honda OBD2 codes and affecting engine performance.

Honda OBD2 Trouble Codes: P0300 – P0399 (Ignition System or Misfires)

P0325 Knock Sensor Circuit Malfunction
P0335 Crankshaft Position (CKP) Sensor Circuit No Signal
P0336 Crankshaft Position (CKP) Sensor Circuit Range/Performance
P0339 Crankshaft Position (CKP) Sensor Circuit Intermittent
P0340 Camshaft Position (CMP) Sensor No Signal
P0341 Camshaft Position (CMP) Sensor Range/Performance
P0341 Variable Valve Timing Control (VTC) Phase Gap
P0344 Camshaft Position (CMP) Sensor Intermittent
P0365 Camshaft Position (CMP) Sensor B No Signal
P0366 Camshaft Position (CMP) Sensor B Range/Performance
P0369 Camshaft Position (CMP) Sensor B Intermittent
P0385 Crankshaft Position (CKP) Sensor B No Signal
P0389 Crankshaft Position (CKP) Sensor B Intermittent

Alt text: Image of a Crankshaft Position (CKP) sensor, a vital component for engine timing and often related to OBD2 error codes.

Honda OBD2 Trouble Codes: P0400 – P0499 (Auxiliary Emission Controls)

P0401 Exhaust Gas Recirculation (EGR) Insufficient Flow
P0404 Exhaust Gas Recirculation (EGR) Control Circuit Range/Performance
P0406 Exhaust Gas Recirculation (EGR) Valve Position Sensor Circuit High Voltage
P0410 Secondary Air Injection System Malfunction
P0411 Secondary Air Injection System Incorrect Flow
P0420 Catalyst System Efficiency Below Threshold (Bank 1)
P0430 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
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
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

Alt text: Diagram of an Evaporative Emission (EVAP) system, highlighting components often related to Honda OBD2 codes and emission control.

Honda OBD2 Trouble Codes: P0500 – P0599 (Vehicle Speed, Idle Control, and Auxiliary Inputs)

P0500 Vehicle Speed Sensor (VSS) Circuit Malfunction
P0501 Vehicle Speed Sensor (VSS) Range/Performance 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
P0521 Engine Oil Pressure (EOP) Sensor Range/Performance Problem
P0522 Engine Oil Pressure (EOP) Sensor Circuit Low Voltage
P0523 Engine Oil Pressure (EOP) Sensor Circuit High Voltage
P0560 ECM Back-up Circuit Low Voltage
P0563 Engine Control Module (ECM)/Powertrain Control Module (PCM) Power Source Circuit Unexpected Voltage

Alt text: Image of a Vehicle Speed Sensor (VSS), crucial for vehicle speed measurement and related to certain Honda OBD2 diagnostic codes.

Honda OBD2 Trouble Codes: P0600 – P0699 (Computer Output Circuit)

P0600 CAN Bus Communication Malfunction
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

Honda OBD2 Trouble Codes: P0700 – P0999 (Transmission)

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P0700 Transmission Control System Malfunction
P0705 Transmission Range Sensor Circuit Malfunction
… (and so on for all P07xx, P08xx, P09xx transmission codes)…

Alt text: Generic image of an automatic transmission, a complex system often associated with Honda OBD2 codes related to shifting and performance.

Honda OBD2 Trouble Codes: P1000 – P1999 (Manufacturer Specific Codes)

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P1020 Valve Pause System Stuck Off
P1021 Valve Pause System Stuck On
… (and so on for all P1xxx codes)…

Honda OBD2 Trouble Codes: P2100 – P2A99 (Throttle Actuator and Fuel/Air Metering)

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P2101 Throttle Actuator Control System Malfunction
P2108 Throttle Actuator Control Module Problem
… (and so on for all P2xxx codes)…

Honda OBD2 Trouble Codes: U0000 – U0999 (Network Communication)

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U0073 Control Module Communication Bus Off
U0107 Lost Communication With Throttle Actuator Control Module
U0121 Lost Communication With Anti-Lock Brake System (ABS) Control Module
U0155 Lost Communication With Instrument Panel Cluster (IPC) Control Module

Disclaimer: This Honda OBD2 codes list is for informational purposes only. Diagnosis and repair should always be performed by qualified technicians. Consult your Honda service manual for detailed troubleshooting procedures.

This comprehensive Honda OBD2 codes list provides a valuable resource for understanding your Honda vehicle’s diagnostic system. By using this guide in conjunction with an OBD2 scanner and professional advice, you can effectively diagnose and address car problems, ensuring your Honda runs smoothly and efficiently.