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We have a 2007 Yukon XL with a 5.3L engine. Recently, the check engine light came on (error codes P0341 for camshaft position sensor, P0335 for Crankshaft Position Sensor Circuit, and second P0335 for Crankshaft Position Sensor Circuit). A few days later, the Stabilitrak message came on followed by the Reduced Power Mode - we could barely limp across a parking lot at this point. It took about 20 minutes for my son to deliver my tools, I disconnect the battery for a minute or two, reconnected it, and we got home fine. Since then, it frequently goes through the same set of problems. I've also noticed it seems to be related to the temperature. During the heat of the day, it will go into RPM more quickly, but I don't have to remove the battery - if the engine cools down for 30 minutes, it will start up and run just fine. The temperature sensor is where it's always been, though. I did rent an automotive diagnostic tool. After the battery has been disconnected, it will within a few minutes pop up the code for the camshaft position sensor. It takes longer for the crankshaft position sensor, and possibly not even during the same drive. I plan on taking the cam position sensor out this week as I know it could be a bad wiring harness or ground, but it doesn't seem as if I'll be able to see much given where it's located. Could there be any relationship between the cam and crank position sensors? After a little Googling, it appears there could also be something wrong with the throttle body or the related position sensor. I'm thinking I'll replace the cam position sensor and check out the leads and ground and clean the throttle body position sensor. I suspect not all sensors went out at once, but I'd appreciate some thoughts as to where I need to start on this. A bit of history: About 2 years ago, the Stabilitrak message pop up followed by the Reduced Power Mode, and it turned out to be the passenger side catalytic converter!!!? This truck had an oil consumption problem that was fixed by the dealership several years ago, and I don't believe that's a problem any more. I never could figure out how a catalytic converter would impact Stabilitrak, but it was gone after the catalytic converter was replaced. Could the Stabilitrak and Reduced Power be caused by the catalytic converter being clogged back up? Thanks