2013 Nissan Altima 2.5 error Code P052b

Hi,  I need your help with this error.  I don’t know where to start.  Is it the crankshaft position sensor? Or the camshaft? 

P052b Generic DTC: Cold Start "A" Camshaft Position Timing Over-Retarded

Not much on google? I was able to follow one of your thread to locate the crankshaft position sensor.  Should I replace this first? 

Please help

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