I own a 2007 Pontiac G6 2.4L which is throwing a hard P0017 and a pending P0017 code. Prior to this it was throwing a P0300 code. I have had 2 diagnostic scans (Sears and a GM dealer) and have not gotten a solution. Sears said everything checked out so they suspected it was the CAT. The GM dealer says that it'* not the CAT and they didn't see the misfire. They both agreed that I had a EVAP leak though. I've owned the car just under two years now. Here is a list of the work I've had done:
Engine(cam phaser, timing tensioner, and guide) Had bad sludge in engine from previous owner
Sensors (Cam and Crank, Knock)
O2 (downstream)
Throttle Body
both actuators
Use Mobile 1 Full Syn oil only

*work done within the last year

P0017 is related to a correlation issue between the camshaft and crankshaft position sensors.


Visually inspect the cam and crank sensors and their harnesses for damage. If you have access to a scope, check the cam and crank patterns. If a pattern is missing, suspect a bad sensor or a slipping tone ring. Remove the cam gear and the crankshaft harmonic balancer and inspect the tone rings for proper alignment and make sure they're not loose or damaged or that they haven't sheared the key that aligns them. If they are properly installed, replace the sensor. If the signal appears normal, then check the timing chain/belt for proper alignment. If it'* misaligned, check for a damaged tensioner that may have allowed the chain/belt to slip a tooth or several teeth. Also check that the belt/chain isn't stretched.