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1995 Chevy P30 with 6.5L - Can't find a PMD on my engine?

7.6K views 10 replies 6 participants last post by  THEFERMANATOR  
You have a "Y" engine (L57) with auto trans.
That is a baro sensor for the TCM.
 
TCM uses the baro to get atmospheric pressure when the truck is started.
Not sure how critical it is.
591=type of baro - 1, 2, or 3 bar (591 is not on my list but should be 12569240 1 bar)
5243 is the production date - 243rd day of 1995