Just replaced the WCM about three or four months ago. Came out Thursday morning, truck cranks but won't turn over. Dad is afraid it's the fuel pump or filter. How do I know if the WCM is bad. I used a code reader/sensor last night..."no codes found" was all I got.

 

If the WCM goes bad, it likely won't crank anymore and the little red light will blink at you with the key on.

 

Ok Thank you.