2003 Buick century

[TThomas1022]

Hello , so my Buick century keeps pulling the p1810 code which is the transmission fluid pressure switch I replaced the WHOLE transmission with another transmission with 91000 miles on it and the code is still popping up , the car will shift sometimes but sometimes it won't go into 3rd gear. The check llight was off for about 30 min after the transmission replacement but came back on with the same p1810 code and that code popped up twice , any idea what it can be besides the transmission fluid pressure switch ? Cause I know it's Not that I replaced the switch and the code is still popping up. Any ideas is helpful. Thanks in advance

 

[NFortin198]

Could be a wiring problem somewhere in the circuit going to the pressure switch.

 

[TThomas1022]

@NFortin198 will that make it not go into third or fourth gear ? and thank you I will be taking it back to the shop sometime this week so they can go over the work they have done.. before I switched out my old tranny for a new one I had the same problem and code now theres a new tranny in the car and I still have the same problem and code.

 

[NFortin198]

Yes... The shift valves are electronically controlled, if they don't get the proper signals, they will not open or close, whichever the case may be, allowing it to shift. Could be something as simple as a loose pin in the connector going from the main harness to the transmission, or a pin pushing out of the connector. Could also be a bent pin in the connector.