Hey all,
I wanted to share my findings related to P06DD Engine code.
First off are my truck stats:
2015 GMC Sierra SLE 5.3L w/ ~130000km.
This truck has been pretty worry free other that the cracked radiator covered under a SSB.
I noticed my truck making a weird whining noise after an oil change. It sounded like a mix between a supercharger and a bad power steering pump. Other than that no tell tail signs untill P06DD code flashed.
I researched a ton and found that it was most likely the oil sending unit or an oil pump issue. I change the oil sending unit but it failed to clear the code.
I got a quote for $2400cad at a local repair shop for an oil pump change out. Big job, lots of hours.
I was so unsure of what to do as the info on the net was a bit flakey. I decided to go ahead and get the pump replaced and asked to have the old pump so I could look for damage.
This is what i found:
It appears to be a stress crack right at the pivot point of the external ring.
The pivot design is a bit different than other Variable Displacement pumps Ive seen.