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Re: 2001 Gran Prix
Yes they may be, but back to the ignition, you will need to take the steering column apart and check what parts are damaged or broken, It may just be the lock cylinder but I doubt it, more likely it is the actuator parts for the ignition switch that the lock cylinder operates when you put the key in and turn it, until it's apart there is no real way to know what's gone wrong.
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that is not related to the ecu of the car, the gas guage is a sending unit in the tank that is with the fuel pump that is most likely going bad, and for the radio it has a ground loop and thats what you are hearing, there is a kit for sale at radio shack to solve the ground loop noises
Sounds like you may have a code for insufficient engine operating tempurature. This is usually caused by a bad thermostat. Its pretty common to see this problem on newer GM vehicles. A new thermostat will take care of it 99% of the time.
To find the thermostat follow the upper hose to the engine. The thermostat will be behind the metal housing that the hose attaches to on the engine.
You can try a reset by removing the key from your ignition and disconnecting the Neg.battery cable for 1-2 min and then reconnecting the battery cable then turn igntion on but don't start the vehicle. If this doesn't work you will need to take it to your local dealership and have them resweep the gauges with there Tech2.
electical is hard to diagnose with out being there. i would treat each problem seperately. first you will need to test the engine temp gauge sending unit. in a dealership this is easy with a scanner they can run a sweep test to se if the gauges are responding.you don't want the engine to over heat if the gauge is not working. next problem the dome light should be easy to fixe does the dome light work with the dome switch?remove the bulb and with the doors open and switch on check for voltage, if voltage check connection and or replace bulb. if no voltage check fuses for voltage.last will need to have the dtc po243 checked out by a repair shop. i hope this will help.