![]() ![]() 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).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 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. If there’s anything you’d like to add, please leave a comment below.P1399 is a Honda specific diagnostic trouble code. Make sure to drive it a little before inspecting the fuel filler neck or checking the EVAP system. It may take the vehicle awhile to reset the code. Most of the time, replacing the fuel cap will clear P1456. Here’s a video on how to test the EVAP vent canister Valve with P1456 in a Honda made vehicle. When the EVAP system is leaking, it can throw P1456 because it would depressurize the fuel tank much in the same way as a missing gas cap would. The only difference in them is they each indicate a different size leak. If it develops a leak, it’ll often also throw codes such as P0455, P0456, or P0457, These codes indicate that there is an EVAP leak. EVAP System– The Evaporative Emissions Control System carries fuel vapor from the fuel tank to the intake manifold.If it has dried out or broken, the fuel tank will no longer be able to pressurize and P1456 will be thrown. There’s an O-Ring that will connect the fuel filler neck to the gas tank. Fuel filler neck/input– It is certainly a good idea to take a look at the fuel filler neck and see if there is any damage or debris that could be keeping the fuel cap from making a tight seal. ![]() Here’s a good article on the symptoms of a bad gas cap. You may also be getting a message that says to tighten the gas cap. When they have gone bad, gas caps typically will fail to tighten. Here is a great video on how a gas cap can cause trouble codes. It’s the most likely reason that the code has been thrown, as well as the least expensive and easiest to access part to replace. Fuel Cap– The fuel cap is the best place to start diagnosing P1456.Certainly every model year is going to have its own set of circumstances, but these are the most likely causes of P1456 in the Honda Odyssey in general. If that’s not it, it’ll usually be the EVAP system. It is telling you the the Odyssey’s diagnostic computer believes that the EVAP leakage is coming from the fuel tank, which is why starting with the fuel cap is a good idea.Īs stated above, the most common cause of P1456 is either a faulty, loose, or missing fuel cap. Symptoms of P1456 typically include the smell of fuel, and P1456. We’ll take a look at those directly below. P1456 is typically caused by a faulty or loose gas cap, although there are other issues that can cause it as well. It is a Honda specific code, which means that it has the same meaning in any vehicle manufactured by Honda (including Acura). P1456 is a very common trouble code in vehicles made by Honda. ![]()
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