Top 10 Most Common Honda Odyssey DTC
If you own a Honda Odyssey, learning the Top 10 Most Common Diagnostic Trouble Codes (DTCs) can help you save time and money when troubleshooting problems. This article discusses the most common DTCs and their potential causes, such as cylinder misfires, catalyst system inefficiency, and EGR flow issues.
TOP 10 DTC
DTC P0420
Description: Catalyst System Efficiency Below Threshold. The powertrain control module (PCM) has detected that the catalytic converter is not working efficiently, resulting in increased emissions.
Cause: Faulty catalytic converter, oxygen sensor, or exhaust system leak.
Symptoms: Check Engine Light (CEL) on, reduced engine performance, decreased fuel efficiency.
Location of Fault: Catalytic converter, upstream and downstream oxygen sensors.
DTC P1456
Description: EVAP System Leak Detected (Fuel Tank System). The PCM has detected a leak in the evaporative emissions control system.
Cause: Loose or damaged fuel cap, faulty EVAP canister or vent valve, a leak in EVAP system hoses or connections.
Symptoms: CEL on, possible fuel odor, decreased fuel efficiency.
Location of Fault: Fuel cap, EVAP canister, vent valve, EVAP hoses, or connections.
DTC P0430
Description: Catalyst System Efficiency Below Threshold Bank 1/Bank 2 . Same as P0420, but refers specifically to Bank 1 and Bank 2 catalytic converters.
Cause: Same as P0420, but may affect one or both catalytic converters.
Symptoms: Check Engine Light (CEL) on, reduced engine performance, decreased fuel efficiency.
Location of Fault: Catalytic converter for Bank 1 and Bank 2, upstream and downstream oxygen sensors.
DTC P0135
Description: O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) The PCM has detected a malfunction in the O2 sensor heater circuit, which helps the sensor reach operating temperature quickly.
Cause: Faulty O2 sensor heater circuit, damaged wiring or connector.
Symptoms: CEL on, reduced engine performance, increased emissions.
Location of Fault: O2 sensor heater circuit, wiring or connector for Bank 1 Sensor 1.
DTC P0300
Description: Random/Multiple Cylinder Misfire Detected The PCM has detected misfires in multiple engine cylinders, which can lead to decreased engine performance and increased emissions.
Cause: Faulty spark plugs, ignition coils, fuel injectors, or engine control module (ECM).
Symptoms: CEL flashing or steady, engine misfires, rough idling, decreased fuel efficiency.
Location of Fault: Spark plugs, ignition coils, fuel injectors, or ECM.
DTC P0740
Description: Torque Converter Clutch Circuit Malfunction. The PCM has detected a malfunction in the torque converter clutch circuit, which can affect transmission operation and lead to decreased fuel efficiency.
Cause: Faulty torque converter clutch solenoid, wiring or connector issues, low transmission fluid levels or poor quality fluid.
Symptoms: CEL on, transmission slipping or shifting poorly, decreased fuel efficiency.
Location of Fault: Torque converter clutch solenoid, wiring or connector for the circuit.
DTC P0171
Description: System Too Lean (Bank 1). The PCM has detected a fuel mixture that is too lean, meaning there is not enough fuel relative to air in the engine cylinders.
Cause: Faulty fuel injectors, vacuum leaks, intake air leaks, or fuel pressure regulator.
Symptoms: CEL on, reduced engine performance, rough idling, decreased fuel efficiency.
Location of Fault: Fuel injectors, vacuum hoses, intake manifold gaskets, or fuel pressure regulator for Bank 1.
DTC P0301
Description: Cylinder 1 Misfire Detected.The PCM has detected misfires in engine cylinder 1, which can lead to decreased engine performance and increased emissions.
Cause: The most common cause of DTC P0301 is a faulty ignition coil or spark plug. Other potential causes include a clogged fuel injector, a vacuum leak, or a low compression in the affected cylinder.
Symptoms:The most common symptom of DTC P0301 is the illumination of the check engine light. Other symptoms may include engine misfires, rough idling, and decreased fuel efficiency..
Location of Fault: DTC P0301 indicates a misfire in cylinder 1, which is typically located at the front of the engine block on the right side (driver’s side) of the vehicle. The location of the fault can be pinpointed with a scan tool that can read live data from the vehicle’s OBD-II system.
DTC P0134
Description: O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1). The PCM has detected no activity from the O2 sensor in Bank 1 Sensor 1, which can lead to increased emissions and decreased fuel efficiency.
Cause: Faulty O2 sensor, damaged wiring or connector, or an issue with the PCM.
Symptoms: CEL on, increased emissions, decreased fuel efficiency.
Location of Fault: O2 sensor, wiring or connector for Bank 1 Sensor 1.
DTC P0141
Description:DTC P0141 is a diagnostic trouble code that indicates a problem with the oxygen sensor heater circuit in Bank 1 Sensor 2 of your vehicle. This DTC is specific to the heater circuit and does not necessarily indicate a problem with the sensor itself..
Cause: The most common cause of DTC P0141 is a faulty oxygen sensor heater circuit. Other potential causes include damaged wiring or connectors, a blown fuse, or a failed PCM (Powertrain Control Module).
Symptoms: The most common symptom of DTC P0141 is the illumination of the check engine light. Other symptoms may include decreased fuel efficiency, rough idling, and engine hesitation during acceleration.
Location of Fault: DTC P0141 is specific to Bank 1 Sensor 2, which is located in the exhaust system after the catalytic converter on the bank of cylinders that contains cylinder 1. The location of the fault can be pinpointed with a scan tool that can read live data from the vehicle’s OBD-II system.
WORDS FROM ME
The Top 10 Most Common Honda Odyssey Diagnostic Trouble Codes (DTCs) can help any Honda Odyssey owner or mechanic effectively diagnose and troubleshoot vehicle issues. These DTCs can provide insight into the root cause of a problem, ranging from catalyst system efficiency issues to cylinder misfires and EGR flow issues. You can save time and money by pinpointing the exact issue and addressing it quickly if you have a better understanding of these DTCs