The PMD is a solenoid pack that builds up heat and uses the injection pump, and the fuel running through it, to absorb that heat. The PMD has been a major problem for Chevy / GMC 6.5L diesel owners since its introduction on the 1994 6.5L electronically controlled DS4 fuel injection pump.
GM Technical Service Bulletin #77-63-06Ab states that: "stalling, hard starting, and hesitation are symptoms of a failing PMD (Pump Mounted Driver) module." These symptoms usually (but not always) set a code 35 or 36 in the 1994 - 1995 models, or a code 1216 in the 1996 - up models.Ī Pump Mounted Driver (PMD) is the black box on the side of the injection pump on 6.5L diesels in GM vehicles.
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