The thermostat is registering temperatures in the

Could be low on coolant or a faulty thermostat.

Check the thermostat. Before it can be opened. You can check this by touching the exhaust pipe from the radiator.

A failed air temperature control blend door motor or sticking door or a failed stuck open engine thermostat.

Passlock is tricky. There is no way to just turn it off. It is an antitheft system, if you could turn it off, so could a potential theif. I do know of a way to bypass it tho. Check out this link. Alot of info, and some DO IT YOURSELF solutions

http://vatspasslockpasskeysecurityhelp.yolasite.com/

Saturn
2000 LS/LS1/LS2/LW1/LW2
2001-2002 L100/LW100
2001-2003 L200/LW200
2001-2005 L300/LW300
2004-2005 L-Series
2002-2008 VUE
1996-2002 SL/SL1/SL2
1996-2002 SC1/SC2
1996-2002 SW1/SW2

Hello,

The 2007 saturn VUE FWD 4 uses a cartridge type oil filter instead of the traditional canister.
The location of the oil filter varies, but for your car it is laying horizontally in the front of the engine next to the exhaust manifold.

Take care and good luck

Here is a plug in kit for your VUE. Follow the link below. http://www.suspensionconnection.com/cgi-bin/suscon/PW60035-vue-kit.html 2002-2007 Saturn Vue - Trailer Wiring Kit Est. Ship Time: 4 to 10 Business Days MFG: Professional Wiring Products Part #: PW60035-vue-kit Sale Price: $44.96 --> --> $49.95 Reg. Price Price good through:
August 27, 2010

Its suppose to do that. if you leave the key in it will shut off when the coolant fan switch reaches preset temperature.

Here is the definition of the code in GM manual:
P0128 - Coolant Thermostat Below Thermostat Regulating Temperature, this indicates the engine is running cold, u need a thermostat

Take it back to the Saturn Dealer, it is still under warranty.