Chevy GMC 6.5L PMD Pump Mounted Driver fits 1994 2001. Part # 35976. Includes harness. This is needed if changing from the older style Black PMD to the new style Gray PMD. If you are replacing a Gray PMD, then you can purchase a Gray PMD without the harness (# 40736).
If your 6.5L diesel (with the DS4 electronic injection pump)
is showing symptoms of stalling, hard starting, and hesitation, you may not
need to replace the injection pump just yet!
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. Often when this
problem is diagnosed at a dealership or repair shop, the customer is told that
the injection pump needs to be replaced. But in most cases, the PMD module can
simply be replaced for a fraction of the price.
The PMD module, (also referred to as the "Fuel Solonoid 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. It has been determined that heat is the primary cause of PMD failures. The PMD is mounted to the side of the fuel injection pump from the factory. But the injection pump does not provide adequate cooling to keep the PMD functional. Once the engine begins showing symptoms of hesitating, stalling and hard starting, the problem will only worsen with time. The problem only becomes more serious when considering the potential danger of your engine stalling in a situation such as pulling into heavy traffic or descending a steep hill and losing the use of power brakes and steering.
Tests show that when using the PMD Relocation Kits, PMD temperatures will drop anywhere from 32 to 81 F* depending on driving conditions. These temperature drops will seriously increase the life of the PMD and can save you money from towing and costly repairs. The PMD Relocation Kit easily mounts on top of the skid plate to eliminate heat issues. Installation is quick, simple and does not require any modifications or special tools. The PMD Relocation Kit comes with everything needed, PMD, wire harness and skid plate mount.
VERY IMPORTANT NOTES:
This kit includes the new style "gray" PMD, which requires a different wiring harness (included) than the old style "black" PMD. If you are replacing a black PMD and mounting this gray PMD back on your injection pump, then this kit has everything you need.
BUT... if you are replacing a black PMD that is mounted on an aftermarket relocation kit, then you WILL NEED to purchase an adapter harness (AP0024) so that the new gray PMD will plug into the old style harness.