Once the engine begins showing symptoms of hesitating, stalling and hard starting, the problem will only worsen with time. But the injection pump does not provide adequate cooling to keep the PMD functional. The PMD is mounted to the side of the fuel injection pump from the factory. It has been determined that heat is the primary cause of PMD failures. The PMD module, (also referred to as the 'Fuel Solenoid Driver') has been a major problem for Chevy / GMC 6.5L diesel owners since the introduction of the 6.5L electronically controlled DS4 fuel injection pump. But in most cases, the PMD module can simply be replaced for a fraction of the price. Often when this problem is diagnosed at a dealership or repair shop, the customer is told that the injection pump needs to be replaced.

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.

BD - PMD Relocation Kit / Aluminum Heat Sink Base (1036520).#7 Fuel Calibration Resistor (508898-7) (You can request a different resistor if needed.).Ford Powerstroke Diesel Parts (1994-2022).

Fuel pump driver module 6.5 diesel