recently got my car running, when to my dads and when i came back my car wont start, so far iv replaced the ignition module, dizzy cap, button, fuel pump, MAF, ect and still no start, so i ran my codes, i got a code 21 and thats it, from what i read im suppost to get a code 12 but im not getting it, just 21 and it keeps repeating and iv adjusted it and reset my codes but it keeps coming, so what would cause me to not get a code 12?

 

bumb

 

I'm pretty sure you are getting code 12, your just reading it backwards.

 

does the starter turn?
does the starter click?
what's battery voltage?

 

you were right i was reading it wrong, im getting the code 12 but after that im just getting 2 short flashs, never a long one to tell me what it is, any help? it just keeps going the short flashes, also the car turns over and tried to fire before i changed the regulator but i cant get the screws tight on the regualtor for it to hold pressure.