Check eng on

Hi! Welcome to JustAnswer. Thank you for contacting us for assistance with your vehicle. I'm Ron. I will be happy to assist you with your question. May I ask to whom I have the pleasure of speaking with today?

mike tomko

Hi Mike. Nice to see you today! I'm sorry to hear you are having this problem. I know this can be frustrating. Please give me one moment to type out some information for you. Sit tight one minute... I'll be right back! Thanks for holding, Mike. When the Check [Engine](/topics-engine-cadillac/) light comes on, this is the on-board computer's way of telling you it sees a problem in one of the monitored systems. Unfortunately, there are literally 100's of parts and sensors monitored in various systems, and to take a "guess" as to which part/sensor in which system is faulty, is virtually impossible. However, if you are not experiencing any drivability issues such as skipping, stalling, shifting problems, etc, then more than likely, the problem is going to lie in the EVAP (emissions control/recovery) system. Very commonly, this could be a faulty, loose or missing fuel cap or even putting fuel in while the vehicle is running can set the light. Check the underside of the fuel cap for any cracks or signs of defects that may keep the cap from sealing correctly. If there are any doubts about the inspection of the cap, replace it. Keep in mind, you will need a cap that meets OE Specs. Those "universal" or "locking" fuel caps sold at after market parts stores do not meet OE specs, and will not seal the system correctly. Check the top of the fuel filler neck for any signs of damage or debris. Check under the vehicle, around the rear areas of the vehicle, looking for any vacuum lines that have dry-rot cracks, holes or loose/missing connections. If these all check out, then the best thing to do at this point is to have the Diagnostic Trouble Codes (aka "p-codes") read from the on-board computer. These p-codes are what is used as a "starting point" for the diagnosis and will tell which part/sensor, in which system, has the fault. Every single Mechanic's first course of action will be to obtain the p-codes. It's standard diagnostic procedure. Once you get these p-codes you can more accurately and efficiently diagnose the problem and then make the correct repair. You can have these p-codes read **<u>FREE</u>** (except in California) at any local "big chain" part store (ie. AutoZone, O'Reilly's, Advanced, etc). If you would like to clear the check engine light, you can remove the "NEG" cable from the battery for a minimum of 5 minutes. Keep in mind- if the reason the check engine light is on was not addressed or fixed incorrectly, the light will return within 50-75 miles of combined city/highway driving (sooner depending on where the problem lies).

if check egn light is on i cant remotestart car from in the house

While the check engine light is on, the remote start will not function. This is a preventative measure in case the reason the check engine light is on can harm the engine while unattended.

if i clear light it will work

Yes. Once the light is off, the remote start will work.

how do i clear code po4421

P04421 is not a valid p-code for this vehicle. P-codes are in the form of "P" followed by 4-digits. For example; P0123

po442this is the code

Mike, the P0442 is a very general code that simply states there is a small leak in the EVAP (emissions control/recovery) System. First course of action here is to have the system "smoked". This is where a machine forces smoke through the system and any leaks can then be more easily found and repaired. If the smoke test proves no leaks, then the Purge Solenoid, Vent Valve and Fuel Tank Pressure sensor would need to be tested for proper operation. This will require the use of a scan-tool that can interact with these items.

thanks ron

You're welcome, Mike! Glad I could be of some help today! I hope everything works out well for you! If there are any additional questions on this issue that should arise, please feel free to reply and ask! Have a great day! Thank you for choosing Just Answer for your questions!

i did what you said light went offa great help

Glad to be of some help, Mike!

thank you ron

You're welcome, Mike!