CAN I USE DIFFERENT GAS CAP ON CHEVY EXPRESS VAN

Check earth connections on both front lights. They are normally bolted close by. Check relays.

https://www.google.com/search?q=2011+Chevy+Express+Van.+The+driver+side+light+goes+out+when+high+beam+is+activated

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Just go onto google and type in how do I change a brake light on a Chevy express van you will be shown a video of how to do it hope this helps

Sounds like you got some bad gas. Be sure and let the station know right away. They may be on the hook to pay for repairs.
Take the van to a shop and have the computer checked for trouble codes.
The gas tank and lines may have to be flushed.

check gas cap
any of the fluids can be low and cause that
brakefluids
trans fluid
ect.
Hope this helps you

The information below was complied by me, it explains what causes the check engine light to come on and the process of finding the cause.

When the Check Engine light (or Service Engine Soon) is turned on, the systems computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible system faults (the gas cap is just one of them) that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen/Oriley and Autozone parts stores (USA only) do this testing for free.

You have to remove the upper applique to remove the tail lamp, it is the trim panel above the lamp. I think it is held in place by two nuts/bolts but not sure. You have to have the rear doors open to remove it

You need to get the codes from the theft deterrent module.Usually a B2960.This will help in the diagnosis of the problem.Hope this helps.Good luck.

Start with fuel system. Listen for fuel pump humm at fuel tank No humm check wiring to pump for power. Then check for spark at plugs and wires. Remove wire from coil and hold near engine and see arch when you crank. No arch. Replace ignition Modular inside distributor cap or cap or rotor

the vent in the gas tank must be plugged have evap system serviced.

There are various fault code that the engine light represents. Get the computer scanned and see what exactly the problem is. It may be a miss fire, or it could also be something else. You said that you just put gas in it...double check the gas cap. Take it off and put it back on. If it is loose, that will set off an emissions code. Hope this helpls.