Vehicle will not crank after disconnect and reconnecting the battery

Thank you. I fixed it.

Just had to reset everything. Unhooked the battery. After that. We held the brake down turned the key to the on position, put it in PND and then back in DNP. That reset everything. It cranked.

Electrical problem
2004 Chevy Trailblazer 6 cyl Four Wheel Drive Automatic

Changed fuel pump and tried starting it and it turned over briefly than nothing at all. Turn the key on and the gauges go crazy, turn key the rest of the way and nothing. Also when trying to take it out of park the button would not depress even when the brake was depressed.

Tried that also and nothing ws thinking it might have did something to the "brain box", acted kind of funny before the fuel pump and then wouldt start so diagnosed to the fuel ump then after evrything went downhill. Someone said something about a ground wire but there so many to trace just one, last resort take it in to the shop

My 04 trailblazer will crank up and turn over but it just won't catch. I start smelli g gas DUI g the turn over. After A couple times trying. If will finally catch and run well the. 2 days later same problem. Any ideas?

2004 trailblazer wont turn over. No codes. Drained the gas tank, put fresh gas in it and still wont turn over. Power to everything, it sounds like it wants to turn over but wont.

I turned over the engine and it died but it still turns over but wont start. Someone unplugged something on the fuel pump but its not the fuses that I can tell.

I purchased this truck from a dealer. Little did I know it needed a motor. Just had motor changed out. Now it will not crank without a boost, changed alternator still having the same problem. Did some resercg and found out it could be two things the bcm or starter. How do I check my bcm ti see if the probkems there. Help what can it be.

Just a boost means that the cranking/starting system is the trouble. Have the battery tested and check for clean connections and good cables (not corroded). Just boosting will do nothing to the system except crutch a weak system. The newnes of the motor now takes a little more effort to turn over than before, so if the sytem was borderline before it now fails. Who installed the engine? Were all the cable put back on(especially the ground from battery to block). Have seen that one a number of times from trans shops. (Ooops did I just say that) If a shop did the job why would they return the vehicle in that condition? Ifthe cables and battery are good have the started tested. The relay that drives the starter is commanded on by the computer, but that won't change with a jump. Cranking the engine is the highest amperage load in the vehicle. If you cannot supply the amperage the system will not perform right. Good luck and let me know how it goes.

Hello, My truck cranks up fine but will not go when put into gear. It revs like the engine is in neutral, even though its not. Cranks just like normal, but literally will not go. Any ideas what may be causing this?