Nissan maxima p1800 code and transmission issues, related??

The service and repair manual with diagram will provide you step by step help to locate and fix the problem easily and you will get the manual from the given link https://toolsnyou.com

have you done anything to fix the fault that caused the code
if not then logically the code will reappear until you go

Variable Intake Air System Control Solenoid Valve Circuit

Read more: https://www.autocodes.com/p1800.html

Type: Nissan OBD POO21

OBD & your codes & read up

lots on the internet

Just don't install parts based on codes

Call a Nissan dealer to see if there is a recall on your car. That problem has been addressed with recalls a couple of times.

To review - - the intake valve solenoid valve controls the flow of oil thru the control valve to adjust valve timing.
The code means the computer "sees" the valve timing as out of range and/or not controllable.
Possible causes could be a defective or stuck solenoid valve, dirty oil causing a blockage, a faulty cam sensor or faulty crank sensor.
Other than changing the oil and filter, the components would need to be checked with a scanner that can look at live data.

Here is the location....

http://www.courtesyparts.com/maxima-parts-a33b-2000-2003/genuine-nissan-parts/engine-electrical/221-distributor/-c-1956_1957_1988_1990.html

CODE PO1800 VIAS CONTROL SOLENOID VALVE CIRCUIT. I DID NOT SEE CODE PO650 BUT CODE PO1800 IS A FAULTY VIAS CONTROL SOLENOID VALVE.

call back your local autozone. they should have given you a print out of possible solutions and they could have told you what to try

You may want to have someone else take a look at it. The Nissan P1800 trouble code is not a transmission control problem. It is described as follows:

Trouble diagnosis name: VIAS control solenoid valve circuit.
Component Description:
The VIAS control solenoid valve cuts the intake manifold vacuum signal for power valve control. It responds to ON/OFF signals from the ECM. When the solenoid is off, the vacuum signal from the intake manifold is cut. When the ECM sends an ON signal the coil pulls the plunger downward and feeds the vacuum signal to the power valve actuator.
DTC detecting condition:
•An excessively low or high voltage signal is sent to ECM through the valve.
Possible cause:
•Harness or connectors (The solenoid valve circuit is open or shorted.)
•VIAS control solenoid valve

Check your vacuum hoses to make sure they are in good shape and are securely attached Aslo check the wiring harness is ok and securely attached as well. If they are, you’ll probably need to replace your VIAS. It's right next to the throttle body.