8l90

[dhutton]

Originally Posted by vet57air

Thx for that. I went to GM dealer today and had them reset the code several times. Funny thing is the GM scanner says the code is gone but my HP tuners says its still there?? Questioning if its the BIM as I had GM reset and then drove around without the BIM plugged in and Code came back. Being a "permanent" code not sure which scanner to believe. All the GM tech had heard of are soft and hard codes. Just looked at my BIM-01-02 manual says normally it does not use Bus Id's as other BIMs do.
So this code P18C2 is the code that had us change the Internal mode switch. GM tech noticed manual didn't work when all back together after he reset, and I guess assumed the BIM cause it was the last thing plugged in. My HP tuners scanner always says the code is there even right after GM tech reset. Now I was assuming the GM scan tool was super duper and could reset permanent codes. Never assume. If you look up Permanent OBD2 codes they tell you they are relatively new and after the repair the vehicle ecu will keep the code active but not light the check engine lamp until it decides the repair is good after a certain number of cycles.

I am not talking about codes. I am talking about the BIM bus address. The instructions to change it are in the BIM instructions. There are four options. Try all four and see if the issue goes away. The permanent code will probably not clear, that is something different.

Don