i have a mazda6 2003--- stopped shifting to first or 4th nothing the get 2nd and 3rd.i replaced the solinoids for transmission,tried another tcm stillt the same--tested fuses all good run system with obd2 and it shows 2 faults in power control system low voltage --tested battery 12.9 off and 13.8 running from altinator i did pick up a p0733 and a p0734 at times -tested the solinoids i removed all were good-- any ideas?

 

i had the solinoids changed and i find no codes in the transmission ,could the installer not plugged the shift silonoids in correctly or left 1 wire unpluged---i get nothing in 1st and 4th.what silonoids operate the 1st and 4 th solinoid for shifting.tested today--no codes just nothing on 1 and 4th gear does i silonoid operat only 1 gear?can somebody give me the location of which one does what. i did find that my charging system is low however after checking ground to body i cleanrd contact--now its at 12.5 at ground on frame was 5.34.i just drove the car--runs great but no 1st or 4th--i feel nothing when put in 1st or 4th

 

You made to many guessed changed parts and also asking the question not provided detailed service information about your transmission?

Your best advise at this point is find a Transmission service shop and have them do a transmission service inspection. They should have the proper testing equipment that will check the TCM or ECU pressure testing and a few other inspections to give you an idea about the issue. I would suggest that you not mention unless they ask if you already went and changed those parts you mentioned. Most shops will likely tell you that the diagnostics will now be to drain and drop the pan and pull the complete valve body min. to check for issues. At this point you may as well start looking for a low millage transmission that come with a slight warranty through the many places across the US that offer them.

This information is for USA and Canda (your profile does not state where in the world you reside??? )Mazda owners only. I have no idea what in this case service shops in other countries would do?