i have a 2008 GMC Acadia. My oil pressure alarm is ringing.

I also find it very difficult to imagine why a GM dealer would replace the ECM as an attempt to repair this problem!! Best I can offer here is > Good luck!

Ok, so the problem is not really an oil pressure problem, the problem is the alarm and how to stop it from ringing. Three different mechanics told me that my oil pressure was fine. I just want to know how I can stop the alarm, which the ECM was supposed to do.

Problem is all audible warnings are controlled by the Body Control Module (BCM).. You’ll need qualified / knowledgeable *hands-on* assistance to property diagnose this for you .. That hasn’t happened yet..