i just learned i need one of these. Part ## R4746568
anyone have a good site i might try to find one ?? the dealership says they can get me one for $212. Also has anyone ever changed one of these things?? How involved is it?? i know it's under the battery but thats the extent of my knowledge on this one. any amount of help will be greatly apreciated.

 

What makes you think you need one (PCM)?

 

i have been trouble shooting a shifting problem or a NON-shifting problem for a while now. if yer feelin froggy check my previous posts. HAHAA long story shrt my truck wouldnt go into over drive... that is... past 3rd gear. so i brought it to the dealer to check the TPS cuz thats what my trouble codes were sayin, and after doin some diggin they found i needed one of these PCM's..... the guy said it was just **** luck that it went cuz it RARLEY happens. anyway thats the skinny on that

 

you can manually engage overdrive by grounding the solenoid through the use of a toggle switch. sure beats buying a new PCM. my truck has a switched overdrive

 

Check and see if your truck is charging. I had the same problem and it turned out to be the Crank Sensor. My sensor was shorting out and during the times of no juice the truck would not shift into 4th. I was told that I also needed a new PCM, I put one in and still had the problem. I tried bypassing the internal voltage regulator with an external one and did it wrong causing an electrical meltdown. So I had to put in another PCM, still had the problem, I put in a new Crank sensor, which fixed the problem. I was gun shy about trying another external VR, but after getting some info I think it would work. Look up the info in the sticky's and make sure you disconnect the little black box from the back of the alternator.