Wow, sorry guys, for the extended delay. I do have an update. I brought the vehicle to a dealer to repair. They had it for 2 months and 1 week, saying first that their “engine specialist” needed to asses the problem, but he was very busy and that was the hold up. 2 weeks later there was no more talk of an “engine specialist, now it was their 1 (and only) technician was out with COVID and would be for 2 more weeks, and his helper didn’t have the knowledge because there was a possible wiring problem. 3 weeks later he still wasn’t back yet but, “was supposed to be coming in today” and the following week in the morning “he hasn’t made it in yet but he would be in shortly” same day around 3, magically a bulletin from Chevy factory appeared telling them to change the ECM. Not to change fuel pump or wiring problem, faulty ECM. However, my vehicle had been sitting there for so long the battery was completely dead, and they needed to install a new one. $282 later, I had a new battery. Now around 4pm same day, they can order ecm, but since it’s so late in the day it would be 2 more days before part arrives and that would cost $785. I ask why so expensive, reply “well $240 for part and the rest labor” $545 dollars to change the ecm that I did myself in less than 10 minutes easy. Doesn’t even require a tool. I reluctantly agree, knowing that new ecm has to be programmed and flashed and all that.
Later that evening I find a ecm $140 from FS1 that comes programmed and flashed, I just need to give them my VIN. All I needed to do was reprogram my key to the new computer. They provided me instructions to do so. Great, so I call dealership first thing next morning, I tell them never mind, I will be coming to get my vehicle, that much labor cost is entirely too much, and how can you tell me the exact cost of labor when you haven’t done the work to know how long it will take? I’m then told “Ohhhh, well the part is already here, I’ll have to see if it can be returned and you’ll have to pay a restocking fee” Now I’m really pissed. Anyway 2 1/2 months and $315 later I have a new battery.
Yesterday the ecm came in, I remove old one and install new one, again very easily under 10 min. Follow instructions to program key and....... it won’t work.
I am trying the 30 minute procedure for all keys lost. My immobilizer light does not stay on like it is supposed to. It only comes on briefly at first then goes away as normal. I have no message on DIC. I scan with my OBD scanner and get a code P0633 immobilizer key not learned. How can immobilizer light go off at ignition on as if functioning normally, and the computer know the key has not been learned. And my key fob will still lock and unlock all the doors? If I attempt to crank, entire DIC goes black, and nothing happens. Absolutely nothing, no sounds, no clicking, no attempt, nothing. So at this point I am lost.
if anyone is still reading this and has any idea what is going on, please help.
I’m told I can bypass immobilizer with my emergency access key code, which could be found in owners manual, but I can’t find it or any mention to such a thing in my manual. Also, if this is true, then there should also be a way to force the transponder to talk to ecm. At least that is my first question when I heard about this bypass procedure. Any info or ideas welcome, anyone know where/how to locate the emergency access key code (EAK) or if that even exists, please share. Thanks guys.
PS you can hijack the thread if you can help me out lol, I’ll gladly give it you
