2008 escalade 6.2 with 130k miles. Completely stock. Had code for bank 2/1 sensor. Replaced with Delphi sensor. Then got code for bank 2 p1175. No running issues. No misfires. Had injectors checked. No vacuum or intake leaks. Cleaned MAF. So replaced both bank 1 & 2 sensors with ac Delco from dealer. Now I'm getting insufficient switching on both banks! P1133 & P1153. Live data shows nice sharp switching on both banks. Any ideas?

 

Just went through this with 2008 Escalade 6.2. New plugs, wires, injectors, O2 sensors, manifold and flange gaskets, intake gaskets, maf, throttle body cleaned, etc etc nothing helped. If you are reading this you are probably at the same place I was- just throwing money and time at it! There is a TSB for this exact problem TSB 08-06-04-045A. I called 5 dealerships before I found 1 that would touch a +200,000 2008 model car. They said they (just like everyone else I talked to about this) had never heard of this code. I told service advisor that I wanted the ecm updated and gave them the tsb number and he looked it up said he did not know if it would fix the issue or not and there was no guarantee since this was not their diagnosis. I’ve been a mechanic 30 years and I knew there was no way it could be anything thing other than something in the way the ecm was processing information (all gm parts, all procedures followed etc) . So after beating my head against a wall, it was an ecm update on a 16 year old car! $185 dollars could have saved a lot of frustration and money. I hope this helps someone else! I tried to share the url and I can’t get it to go, so search TSB 08-06-04-045A