Hi. 2017 Sierra, Z71, 5.3.
Got the dreaded MIL while driving day before yesterday, seemed to run fine. Yesterday went to start it and it ran rough, in "Reduced Power" mode. Shut it off because I had other things to do. Today I put the code reader on it and got P219B and P2101. Those are just generic codes. We have a common cause for that? It ran a lot better today than yesterday. Tomorrow I'm planning on putting the scanner in "Live Data Mode", clearing the codes and going on a few errands to see what pops up.
Got the dreaded MIL while driving day before yesterday, seemed to run fine. Yesterday went to start it and it ran rough, in "Reduced Power" mode. Shut it off because I had other things to do. Today I put the code reader on it and got P219B and P2101. Those are just generic codes. We have a common cause for that? It ran a lot better today than yesterday. Tomorrow I'm planning on putting the scanner in "Live Data Mode", clearing the codes and going on a few errands to see what pops up.
