I think I may have a failing PMD, just wondering what other drivers experience when theirs acts up. I am seeing slower acceleration, smoke under hard acceleration, hesitation between shifts under hard acceleration and it doesn't start as good as it used to.

 

the truck wouldnt start about a month ago, then started up after sitting for an hour, last week it died on the highway while doing 70mph, the next morning started up drove it home and it died in my driveway, replaced PMD, started right up no problems since

99% of pmds will go out if you have the factory one still in there......do it now before you are on the freeway like me and it dies out of nowhere.... I also replaced my fuel filter which was super easy, the old one was black.....

 

do a LP and OPS test first before spending money on PMD and check all your grounds , fuel filter air filter

If OPS or LP is bad it gave you hard time starting and hesitation

 

crusie control usually dosent work when pmds start to fail but i have never had a pmd fail on me.

 

I now have those diesel smelly oil soaked hands, and I have only owned a diesel for less than a month, don't make me too happy now.. these PMD deals are for the birds......

 

Just went thru a ton of research when my 97 6,5 started acelerate on it's own. After a lot of questions and searches on line I put on a new PMD and it runs fine no. No more wild aceleration.
Pete

 

Hello guys,

I am doing a lot of research on the PMD. There is still many problems with the current production design. If you have a run away motor or surging motor condition is due to a bad capacitor that is normally supposed to mitigate EMI on the electrically isolated heat sink. This is not due to heat, but heat makes the internal trace resistances go up and this makes this makes the condition come on earlier.

If you sand off the anodizing on the heat sink and ground it, all of the EMI noise on the heat sink will be suppressed allowing the internal IC's to have a better signal (there is so much noise in this condition that the power transistors think they are supposed to be on all of the time).

I have a post about the PMD in another forum if you are interested:

NEW PMD design for 2011 and PMD info - Diesel Place : Chevrolet and GMC Diesel Truck Forums

 

I have talked to GM and they are "looking" into our growing problem with the PMD's so sign my petition and lets get this fixed they told me they wouldn't fix mine because they don't approve of modifications, even if it will fix a design flaw abviously BS.. lets get this taken care of.. diesel engines PMD short life span shoudl be fixed at manufacturers cost
here is the link to sign my petition...