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PO336 crank sensor 99 ram help


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So when I’m driving down the road sometimes my truck loses its tach and usually comes back within a few minutes. When it does it the check engine light comes on too. After you shut it off and restart it check engine light is gone. 

Recently I was going down the road and it did it and missed a little when it lost its tach so I drove home to get my scan tool before I shut the truck off and got po336.

 

I have read the article on the site pertaining to the code and need further info because my 12v test light doesn’t come on when it tells me to the B connector and it says to perform test Ver-5a, this is step 5 of the test. I’m not sure where to find this test can anyone help? Thanks 

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