Gascap light comes on when i start up car

Start by rebooting the as explained regkyl.
If issue returns then get a new gascap and reboot again. The seal on your cap is maybe worn out.
If issue still return then you'll have no choice to go and have the sensor checked and hope the problem is not with the cluster...

It needs a gascap. You can get a free scan at Autozone, Advance, or Oreilys. A Code will be set if the cap is loose or missing.

There are other possible reasons for your drivability problems, but get the scan, put on a gascap and fix scan results.

Scan for emission fault then follow the correct diagnostic procedure it may have a large leak in the emissions some where

these are sensitive to the gas cap being installed properly and tightly,if not then the light will come on,this is a system that performs a pressure tested system under the right conditions to make sure there is not a leak in the vapor system of the emission system

Hello, what did someone do to repair it? Here is what you need to do. Go to Autozone or Oreillys and get a free scan. If it still shows gascap then ask them to clear the onboard computer. With the engine off, tighten your gascap again.

Everytime you put on the gascap loosely, you will get this alarm and it will stay on 25-35 Startups or until you get the computer cleared.

However, if you eliminate the gascap there are other problems which you may have that require a special tool called a smoke machine. You have a leak in one of your pollution hoses for the fuel tank. Only the smoke machine can find a small leak like this. Once you find the leak it is a simple matter to fix.

You can call around to find a repair shop with the proper equipment. I hope you find my solution informative and feel well served.

this will keep happening until the problem is fixxed, theres an evap system leak, the cap light comes on because most of the time its a cap ,but not yours, the system needs checking you may have a bad valve or broken vacuum line for the evap system, this system has lines running from gas tank to engine with valves and soleniods and it everything is not working or the system cant hold vacuum it will turn on the light, a smoke machine is need to test the system and find the leak, hope this is helpful.

Look at the cap itself as well as the evaporative emission components. The fuel vapor recovery system is open, somewhere.

It might take 2 or 3 gas fill-ups before the light goes off. Don't worry.

You will need to get the code befoe anyone can begin to diagnose this, There are about 5 parts that can cause this problems. The gas cap is one of them. If anyone has been uner the hood just pryor to this happening its possible they left a vacuum hose off or maybe broke one.

If this car is really an 07 then this being an emission issue you are covered under warrenty. Take it to the dealer.

I had this similar problem but gascap and engine light on. I changed out the gas cap cleared codes and both were back o. Went to the dealer he insisted it was the after market gascap changed in and cleared the codes. Before I even left the lot they were both back on. Finally they found the problem they had to change out some kind of pump and canister and it fixed the problem.