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If I'm not mistaken, I believe that P0391 has to do with the camshaft position sensor.
 

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Discussion Starter · #3 ·
yeah,

i saw on another tech forum somewhere what the code meant

took it to dealership.

was not a bad sensor (camshaft). they say i need an ECM flash, that's it.
 

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Just got the same engine light issue yesterday and Onstar gave me P0391 also.
Was scheduled for an oil change so at the dealer today.
 

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The code for the gas cap is usually P0455 for a large evaporative leak (or sometimes P04xx for a smaller leak).
 
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