648g trans goes in neutral

There are some videos on u tube which may help ypu

Though it will not harm your transmission to shift into Neutral while your vehicle is in motion, the additional wear on your brakes by leaving the transmission in Drive will be negligible over the life of the brake pads. It is that minor. NEVER, EVER go into neutral while slowing down to a stop, for 3 reasons: 1.
https://mechanics.stackexchange.com/questions/3902/automatic-transmission-is-shifting-to-neutral-while-approaching-stops-bad

10 Most Common Transmission Problems

www.transmissionrepaircostguide.com/10-common-transmission-proble...

Ever notice that while driving that the car hesitates or refuses to go into gear? ... For automatic transmissions, you might notice that when shifting into drive or park ....Neutral and park gears no problem, but drive, 1st, 2nd and reverse engages ...

Trans Goes Into Neutral While Driving - Transmission ...

www.transmissionrepaircostguide.com/topic/trans-goes-into-neutral/

Jun 5, 2015 - When I put it in drive, and begin to drive away the transmission will put itself in neutral. When I slow back down, it will go back into gear.

there is a park / neutral switch on standard transmissions also

bad proportioning valve

If you need further help, I’m available over the phone at https://www.6ya.com/expert/michael_00678fd4800d19c5

check for vacum leak

all you can do @ this time is to drop the pan, drain the fluid, clean the pan, magnet, etc., install new gasket & filter, refill w/ the correct trans fluid, donot overfill !!!!!!!!!!!!! check for loose shift rods, adjust as required, check the lines for leaks, maybe replace neutral safety switch, see if it improved or fixed your issue ! other than that, you may need a rebuild ?????? torque converter & or pump could be ready to go ???? inside trans . have a trans shop check it out, at least thats free !good luck

Hi,
Do you have a Check Engine Light on? If so, you must take it to a shop or GM dealer to diagnose, unless you have an OBD2 scanner. Some auto parts stores will check codes for free.


Check your fluid level - hopefully, it's just low, but if it smells burnt when you check it - How To in the Owner's Manual - after just having it changed, then your transmission may be going.


It could be a sensor in the transmission, but the fact that it goes into 'neutral' is a bad sign.


GL,
Td

The transmission fluid level is to be checked with the ENGINE RUNNING, ond trans in park or neutral. there is fluid in the torque converter that will raise the fluid level when the engine is off..this is normal. So, I suspect that you may be low on fluid. and the indication after being parked for a while is not valid. Engine MUST be running, and ideally the trans fluid warmed up, but not critical.

check out the neutral saftey switch on trans, if its reporting unknown gear on scanner while moving t bar it wont know what gear to be in and give you similar problems, also has oil been leaking into switch before?