Ouch. Any tapping noises could be catastrophically bad. When the oil pump disintegrates, where do you think the parts went? Probably the bottom of the oil pan. And if the ice was running without oil as it's life blood all sorts of pieces could overheat and break causing all sorts of problems (pistons rings, valve stems, rocker arms, crankshaft, etc). Knock sensor means that stuff isn't firing right so this is very bad, probably needs and engine overhaul and even worse, if anything damaged the engine block, a new engine. Once metal parts inside the engine are broken, fresh oil doesn't help, the damage is done. Hopefully the problem is something in the cylinder head (which is cheaper to fix) than something deeper inside. That said, how did you exceed the power train warranty? Power train is something like 8 years or 100k miles (and in some states 150k miles). Did you exceed the miles or were you mixing up bumper to bumper with powertrain?The oil pump in my 2012 Volt disintegrated suddenly without any prior warning just one month out of power train warranty.
GM is not helping me to fix this because I bought the car pre-owned (so, no Good Will warranty even though I have maintained the car as recommended and the prior owner's maintenance records are in the glove box. I spoke with GM customer service and the Electric Vehicle team and all said the same as the dealer service manager: I am out of luck as per GM policy).
So, I spent $2500 to have the oil pump replaced (at a Chevy dealer) and the car ran fine for about a week. Now it's making a tapping/clicking noise and the Knock Sensor error (P0324) has triggered the CEL.
Anyone else have an oil pump disintegrate? I am planning to file a report with the NHTSA so that there is some oversight. But, I am curious if there are any other cases of oil pumps disintegrating like the one in my car did.
Thoughts on what the tapping might be now? It is full of oil and the oil is clean.