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2014 5.3l silverado p0521 code

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I have no oil pressure I changed the sensor under throttlebody and have same problem is there a sending unit on the 2014 motors as I know the older motors have the sending unit on the back 

Edited by Jfaidley
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1 hour ago, Jfaidley said:

Update was the oil pump also took out motor 

Crud. Did the oil pressure just go away? How many miles on the truck? My 2014 is right at 117k.

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