P1399 is a drivability issue and needs fixed as soon as possible.Most commonly caused by valves that are out of adjustment or an ignition issue.It means that more than one cylinder is misfiring, and is most commonly caused by valves that are out of adjustment, or ignition issues. But, don’t rush in and do that without checking the Odyssey’s easier to check potential issues first.P1399 is a Honda specific diagnostic trouble code.
#P1399 HONDA ODYSSEY 2003 CODE#
The most common fix for this code would be a valve lash adjustment. It would be pretty unfortunate to end up doing a whole valve adjustment, only to find that the EGR system just needed cleaning. EGRĬlogged EGR passages have been known to cause P1399, and they are super easy to check. Before doing that, you may want to check the EGR passages.
If it appears the ignition system is fine, it may be time to look at valve lash. Or if they haven’t been replaced in a while, slap new ones on and see what happens. Now if your Odyssey is old enough to have an engine with a distributor, it could be a bad spark plug wire, cap, or rotor that is causing the misfire. If not, you’d want to take a look at the coil packs and test them. At this point, you’d want to slap a new spark plug in there and see if that solves the problem. Using the above method, you should be able to tell which cylinder is misfiring(or if the misfire is truly random).
He was able to find P1399 being caused by a spark plug that looked just fine. Here’s a video of a guy doing EXACTLY THAT. If you are feeling adventurous, you can pull one plug at a time and see if that stops the misfiring sound. If the spark plugs are looking ok, it may be that you have a bad coil pack (or not). This happens a lot on Honda’s for whatever reason. You’re going to want to start by looking at the spark plugs. So, P1399 can be caused by a misfire in one cylinder only. If the crank sensor is telling us that the misfire is “random”, is it? The crank sensor can only tell the speed of the crankshaft. There’s one thing we need to keep in mind. Ignition System The nasty guy on the left came from an Odyssey. Now, it may be running skunky even when the engine is warm and still in need of a valve adjustment, but we’d want to look at the ignition system components before jumping straight to a valve adjustment. If the above example describes how your vehicle has been running, and you have code P1399 by itself, without looking at anything else it’s about a 7/10 chance that the valves need adjusting. But, by the time you get to the grocery store, it’s running like a top. Or it’ll die when it gets to the stop sign at the end of your neighborhood. Once the engine warms up, it’s not as pronounced.Įxample: You’ll start the vehicle up, it may have a hard time finding the right idle speed and it’ll die when you put it in gear. If your Honda Odyssey’s valves are in need of adjustment, it’s usually way more noticeable when the engine is cold. The good news (if you want to call it that) is that usually your Odyssey will behave differently depending on which one it is. They are valves that are out of adjustment and ignition issues. Here are the common issues that commonly cause P1399. Since the engine is almost always actually misfiring when P1399 is present, there are almost always noticeable symptoms. Triggered by variance in the Crank Position Sensor speed (which would indicate a misfire).It means that more than one of your Odyssey’s cylinders is misfiring (maybe just one, more on that below), and is most common fix is to adjust the valve lash or replace the bad ignition component. P1399 is a Honda specific diagnostic trouble code.
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