How to replace the ECM (PCM)

The "service engine soon" light has been coming on and one time we had a light come on that said something about reduced engine performance. I went to Autozone and they ran a scan when the "service engine soon" light was on. The code was P0601. They said the ECM needed to be replaced. They are telling me if I supply VIN number, year, make, model, engine size, OEM number of ECM I will receive correct flash computer. Flash technology unit pre-programmed at the factory.

I bought a used computer for this vehicle. What has to be done to get on and running?
Does it need to be reprogrammed?

Six cylinder four wheel drive automatic 107,000 miles.

I have been trying to install a bypass module in my vehicle so I can install my new remote start. The module requires me to dial in the correct resistance value from the pass wire off ignition switch. With my digital ohm meter I am getting an alternating resistance variable every time I turn the key to crank. My question is how can I get a specific variable that will stop me from tripping my security and leaving me stranded for ten minutes? Or should I buy an auto learn bypass module? Will the alternating resistance be hard for even an auto learn bypass to zero in on? I found that hooking up the remote start not as hard as I have heard, just the bypass that has me stumped. Thanks a heap for your input! JD

Thanks for your input. I have an auto learn bypass in route. Hope that does the trick. Bulldogsecurity. Com also has a complete accurate wiring diagram for any vehicle for future information.
JD

Replace ECU.

My wife was driving home from work yesterday and said the truck was running very rough. While she was stopped at an intersection, it stalled out. She figured it was because she was low on fuel so she stopped and put about eight gallons in. The fuel gauge did not move at all and she noticed that the oil pressure gauge was pegged out over 80 psi. She was able to drive it to me at work and I gave her my car. After work, I tried to start the truck and it did not even attempt to turn over. Slight click heard from the starter, gauges lit up, engine light came on. I turned the key back to the accessories position and could hear an eerie noise from what seemed like behind the radio. I tried to start it again and the same thing happened. When I tried to remove the key from the ignition, it would not release or turn all the way to the off position. Also tried to shift gears with no luck either. I disconnected the battery and the truck is just sitting right now. I am pretty sure that it is an issue with the ECM, BCM, or Car Gods forbid, both! Any insight or suggestions would be much appreciated since these are both very expensive parts and the timing on this could not be any worse(my wife is eight months pregnant with our first child). I did just replace the transmission oil cooler lines on this wonderful vehicle no more than two weeks ago. Changed the oil at the same time and all fluids were added to vehicle specs as well as checked periodically for about a week after. Thanks in advance!

I will try that tomorrow morning and let you know how it goes. Thank you for that extremely fast response!

It turned out being the alternator. It went haywire and fried the battery and took out about 10 fuses. Luckily the batter was still covered under the warranty by 3 months! Replaced the alternator, battery, and bad fuses and it is running great. Thanks for the help!