Ive been having issues with my automatic 2005 350z. OBD reader is pulling P1764 and P1754 which both say basically the same thing; A/T D/C solenoid circuit malfunction. It’s almost like it gets stuck in first gear, i’m hitting between 3 and 4 RPMs just to get to 5 miles and hour but once it get out of first gear it drives like how it used to. Shifting from park to reverse is HARSH and from neutral to drive isn’t all that smooth either but reverse to neutral and drive to neutral and smooth as can be. Check engine and AT lights are both on. I started by switching my transmission fluid for Redline like a lot of people recommended and that didn’t really help any. I then replaced my solenoids and my entire valve body. Nothing changed, the same codes are still pulling and first gear is still just as rough. No one really rebuilds automatic 350z so i’m having a really hard time finding information on these codes. I saw a lot of people saying to check the brake/neutral switch or neutral safety switch but i can’t find anything locating it and i’m confused why that would be an issue since by car is automatic. If anyone has any tips for me or has had this issue before please help me! I’ve been car-less for over a month!

 

The neutral safety switch is only there to lock out the starter unless it's in N or P, nothing else.
When was it last serviced, how many miles?