It could be a lot of different things, First you need to scan the engine with a engine scanner to see if it has any hard codes. There is a problem with the emission system somewhere.
The Service Engine or Check Engine light comes on when the ECU has detected a problem with the emissions system. Do not ignore this light even if the engine seems to be running fine. Failure to repair this can cause damage to the catalytic converter especially if the vehicle is not running good or using excess fuel.
On some makes of vehicle, the engine fan is supposed to keep running after the engine is shut off, if it was operating on a long trip on a hot day, for example. Come back to the car in 10-15 minutes. If the fan is still running, you have a problem. If it has shut off, all is well.
When the service engine soon light is blinking, it means a subsystem of the engine has failed. It could be something as simple as a broken gas cap, or it could be a serious engine problem. If the Explorer is still running fine, it is best to get the codes read at an auto service shop to determine the next course of action.
When service engine light is on on a 2003 Chevy Trailblazer, the problem could be a faulty thermostat, a circuit range performance problem, or any other problem.
no as long as the engine is running the pump needss to remain on
the service engine light is on due to the fact that there is a problem with your truck, this is confirmed by the way your truck is running. you need to get a engine diagnostic check at an auto shop. may just need a tune-up, or the truck has a bad sensor, or engine woes.
If the security light on dash is on then it's a passlock problem. If not check the fuel pump first
Not a problem unless you plan on running the engine... Of course it is a problem. An oil filter is mandatory for the life of the engine.
When the service engine soon light comes on it means the computer has found a problem, it should post a code in the computer memory. Plug a scanner into the port and it should give you the code. From that you can look up what the code means and that will give you some idea of what the problem may be.
After running for a few minutes...Need more information?
Either try disconnecting the battery for about 10 minutes or have vehicle scanned to determine problem and have codes cleared
Indicative of problem with engine emission system