Misfire in your Honda Odyssey is a common issue. Cylinder misfire occurs when your Odyssey ignition coils are not firing in the right sequence. Today I’ll be showing you how to fix Odyssey misfire, and troubleshoot or root cause the issue. When your Honda Odyssey is misfiring, this can cause an OBDII trouble code to trigger, specifically the P0300 DTC engine light.
When your Odyssey check engine light is triggered, your Honda will not run correctly. Often times this can create a limp mode situation, in which your Odyssey doesn’t accelerate. This can happen due to a number of issues. Your Honda ECU or onboard computer is responsible for controlling ignition events, and a variety of problems can lead to Odyssey misfire.
How to fix Odyssey misfire
When your scan tool is showing a Honda Odyssey P0300 OBDII DTC trouble code, it’s rarely a laughing matter. The specific language for this OBDII check engine code is Generic Engine Misfire or Random misfire.
Because the Powertrain Control Module or your computer cannot locate and specify the cylinder that is having the misfire specifically, it can be confusing and difficult to track down the problem ignition coil.
Today I will be showing you how to locate misfire in a 2001 Honda Odyssey 3.5 liter van. You will not need any specific tools to locate and find the problem cylinder. You will need a 10mm socket as well as a standard screwdriver in order to remove the J35 engine cover however.
Test your Odyssey Ignition components
You will begin by opening your hood and removing the plastic engine shield so that you can reach all of your coil on plugs. Because your 3.5 liter Odyssey uses coil on ignition coils, we will locate the problem cylinder by unplugging one cylinder at a time.
As always when working around your engine bay, keep yourself and your clothing clear of the engine and drive belts as well as the cooling fan. Begin by removing the 10mm bolts that hold the plastic shield to the intake manifold.
Before you can begin to fix Odyssey misfire issues, you need the right tools. There are four total 10mm bolts that must be removed before you move on. Now using your flathead screwdriver, undo the front plastic rivets that secure the spark plug covers.
These are the plastic shields with the words 3.5 liter VTEC across them. There’s two plastic rivets that must be loosened to pull off the plastic covers. Once you have both sides taken off, you can remove the top of the engine cover. You should now be able to access the entire 3.5 liter engine.
From this point you will need to start your engine. If your car doesn’t want to idle, try to have a friend maintain the engine idle by holding the engine speed or RPMs steady. Now begin our test by unplugging your coil on ignition coils, one at a time.
Listen to the engine to determine which cylinder is the problem one. When you unplug one of these ignition coils, and your engine doesn’t change much it’s a clear sign that you’ve found the source of your Odyssey P0300 trouble code.
Test one cylinder at a time until you have found the issue, and replace it with a direct fit ignition coil. When you have located the problem coil, you know how to fix Odyssey misfire by replacing the problem coil in question.
Once you have replaced the problem ignition coil you can clear your trouble code with the appropriate OBDII scan tool. Have any questions about this Odyssey P0300 guide? Leave them for me below and let me know!
should i change the sparkplug or the coil or injector or all three on my honda ossey 2008 with code p301
Hey there William,
Couple of questions for you, when does the Odyssey misfire occur? have you isolated it according to these Honda troubleshooting steps? If you have isolated a coil or plug that is bad, then yes try to replace the parts involved.
Hope that helps.
My 2011 Odyssey is missing in both 1 and 4 cylinders I tried moving the coils to other cylinders and found that the #4 coil was bad. It t still was missing on 1,4 so I decided to replace the plugs anyway because they were worn down, however still have a miss on 1 and 4. Any thoughts on which direction to head towards now? Injectors? Timing belt? Any suggestions would be greatly appreciated!
Hey Nelson, thanks for reading!
The good ol 2011 Honda Odyssey – steady and reliable, until it’s not. You’ve already done some great detective work: swapped coils (good move!), caught the bad one on #4 (RIP, little coil), and gave the spark plugs a much-needed retirement party. Yet Cylinders 1 and 4 are still throwing tantrums? Let’s crack this case wide open.
Now, here’s where it gets juicy:
Fuel Injectors – Yep, these could be your prime suspects now. Think of them as caffeinated baristas—if they’re not delivering the fuel espresso properly, your engine’s gonna run groggy. Try swapping the injectors from cylinders 1 and 4 to different cylinders. If the misfire follows them, bingo: you’ve got two lazy baristas on your hands.
Injector Wiring – Before blaming the injectors entirely, check the wiring and connectors. A pinched wire or crusty connector could be sabotaging your efforts. A noid light or scope test will help you here—like giving your injectors a lie detector test.
So yeah, next step: injector swap test. If those misfires start traveling like rebellious teenagers looking for trouble, you’ll know who to ground.
Let me know what happens—or if you want help narrowing it down further!