Trouble codes › By vehicle › Honda Odyssey
Common check-engine codes on the Honda Odyssey
2005-2022
Odysseys use Honda's 3.5L V6, which on many years has Variable Cylinder Management (VCM). VCM-related misfires and fouled plugs are the best-known problem; transmissions on some older models are another.
Most common: P0300, P0420, P0171, P0456, P0730.
Known problems on the Honda Odyssey
- Honda 3.5L V6 VCM misfires and fouled spark plugs (P0300, P0301, P0302, P0303)
P0300 Random/Multiple Cylinder Misfire Detected
P0300 means the engine is misfiring in more than one cylinder, often from worn plugs or coils, a vacuum leak or low fuel pressure.
On the Honda Odyssey: Misfires on the cylinders VCM shuts off are well known, linked to oil fouling the plugs; Honda issued bulletins and software updates. Check with a Honda dealer using your VIN.
P0300: causes, can I keep driving, and what to check first →
P0420 Catalyst System Efficiency Below Threshold (Bank 1)
P0420 means the catalytic converter on bank 1 isn't cleaning the exhaust well enough, usually a worn converter, an exhaust leak or a lazy oxygen sensor.
On the Honda Odyssey: Catalyst efficiency, often with P0430: fix misfires first.
P0420: causes, can I keep driving, and what to check first →
P0171 System Too Lean (Bank 1)
P0171 means bank 1 is running lean (too much air or too little fuel), most often from a vacuum leak or a dirty MAF sensor.
On the Honda Odyssey: Lean codes, often with P0174: vacuum leaks or the air-fuel sensor.
P0171: causes, can I keep driving, and what to check first →
P0456 Evaporative Emission System Leak Detected (Very Small Leak)
P0456 means the EVAP system has a very small leak, often a gas cap that isn't sealing perfectly.
On the Honda Odyssey: Very small EVAP leaks: the gas cap first.
P0456: causes, can I keep driving, and what to check first →
P0730 Incorrect Gear Ratio
P0730 means the transmission isn't holding the gear it's supposed to be in: something is slipping.
On the Honda Odyssey: Incorrect gear ratio or slipping on older Odysseys' 5-speed automatics was a known problem; Honda extended warranties on some years. Check the fluid and transmission codes.
P0730: causes, can I keep driving, and what to check first →
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Common codes and known problems as widely reported for these model years; your vehicle may differ. Check nhtsa.gov/recalls and ask a dealer about service bulletins for your VIN, and confirm in your service information.