SOURCE: how to reset engine light no codes found
If the light is on, there are codes remaining. You can clear the codes, you'll need a scan tool, but if the problem isn't fixed the light will return.
On some cars you can disconnect the battery for 5 minutes and that will reset the codes, but I would recommend you DON'T do that. Use a scan tool and clear the codes properly. Good luck!
SOURCE: The check engine light is on.
Sometimes disconnecting the battery for a few minutes will reset the check engine light. Make sure you have the correct radio code before doing this or your radio will not work after disconnecting the battery.
SOURCE: Car runs greAt BUT FLASHES LITE PO300 P1781
P0300 is a random engine misfire code. P 1781 is a transmission code, but it refers to a malfunctioning engine speed signal (crankshaft angle sensor). A bad crankshaft angle sensor or camshaft angle sensor can cause the P0300 code. A large list of items can cause a P0300 code, but since you have both, I'd be checking the crankshaft angle sensor and the related circuit. Sometimes, the mounting screws loosen up, which can cause the sensor to not function properly, all the time. Get this fixed, because over a period of 4 to 6 months, this can destroy the catalytic converter in the exhaust system ($$$$)
Charlie
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SOURCE: 1999 gmc 5.7 how do i reset service engine soon
sometimes as with mine i had to take it to the dealer or a trusted mechanic and have him hook up the diagnostic computer to clear it. it will tell him what is wrong with it too. mine was the catalytic converter. it will keep coming on if car is not fixed. i took mine to the dealer and it cost $1200.00 out of my pocket. find someone else if this is the issue and have them only cut off the catalytic converter and only replace that part. much cheaper only cost me $300.00 parts and labor for my 2003 yukon xl.
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