Sure Cure GM 6.5 PMD Repair Service


We will repair your blown PMD for $39.95 with return shipping included.  [Also known as the Fuel Solenoid Driver or "FSD"]  The price is set to iclude the LPMFRB shipping amount of $14.95 which is the default on the website so $25.00 plus $14.95 equals $39.95.  Because there is so much "friendly fraud" with bankcards, this service is SOLD BY BITCOIN PAYMENT ONLY

We do not do "rush" jobs.

This repair is NOT guaranteed, and you need to mark your power transistors on the bottom with paint or fingernail polish etc . . BEFORE you ship your PMD to us.

Shipping to us is your cost and responsibility AFTER payment is made, and you need to write the ORDER NUMBER on the box so we can indentify your PMD when it comes in.

Return shipping to you in the Domestic US and areas served tby the US Postal Service is included.   Overseas shipping may be accomplished by selecting the method and paying for it at checkout.

Starts but immediately dies . . .  won't accelerate strongly . . . fish-bites (hiccups and stumbles) when driving like it wants to die - and stumbles but keeps running . . .  hard shifts gears . . . - driving and it cuts out but will start again . . . . hard to start in the morning - skip starts requiring a lot of cranking time . . .  idling and just cuts off..  Chances are greater than not it is the lift pump which is causing your PMD to overeat and eventually DIE, and as to the lift pump it does not matter if you bought it literally YESTERDAY, but a weak lift pump has been know to blow a NEW PMD in less than a week !!

There is a LOT of misinformation about the causes of the failures of the 6.5 PMD - or "Pump Mounted Driver" - also called the Fuel Solenoid Driver [FSD] too.

It is always said that GM made a mistake mounting the PMD on the side of the Injection Pump, and it needs to be remote mounted on an aluminum cooler plate with fins to keep it from failing.

NOT TRUE.  The truth is the Injection Pump (IP) has a perfect place (yes admittedly hard to get to)  to mount the PMD - and IF the IP is keep under proper pressure of fuel above 5 psi which means the fuel is recirculating like it is supposed to - there is a large pool of fuel under the PMD that exits at the TOP of the IP and thus draws the heat from the PMD and that created by the IP operation and sends it back to the fuel tank where it is dumped into the fuel of the tank.  This also serves the purpose of force lubrication under the fuel pressure to lubricate the IP itself thus also keeping the friction of the moving parts of the IP to a minimum

The REALITY and TRUTH is the real problem with the 6.5 is that the STOCK lift pump CANNOT and DOES NOT keep fuel pressure above 5 psi, and thus recirculating this fuel so - it causes damage to and eventual failure of the PMD by "blowing" the power transistors that you can see on the underside of the PMD - and at least five things simultaneously happen.

1.  The IP does not run well without pressurized immersion lubrication, thus causing wear to the IP.

2.  The first stage of the IP does not have enough fuel under pressure to send to the second stage for maximum compression to prepare to inject.  This IP is self regulating and uses  what it requires up to 14 psi to have adequate pop pressure for a good strong running diesel.

3.  To compensate for the weak fuel pressure, (and this is worst part) the PCM finds itself commanding the fuel solenoid to hold itself "more open" in a higher "duty cycle" no different than like a fuel injector would -  to let the maximum missing fuel through - and that is what CAUSES the transistors on the PMD to heat up - because they are in the circuit as high speed "switches" and if this overworking is not bad enough - if there is no way to dump the heat they create somewhere they will burn themselves up - and that will be the end of th PMD - and at the very least shorten the reliabie life time of the transistors themselves.  This will overheat ALSO the fuel solenoid itself - when the system was designed for fuel pressure to partly hold it open - in essence the engine is designed to let itself "idle" and even accelerate somewhat by the increased fuel pressure at the fuel solenoid "plate".  

When transistors are overworked like that their operating characteristics with them from there on "vary" - they may not FAIL immediately. but they will behave erratically to their specifications and this cannot be fixed ever.  The transistors - if taken out - may well even  "test" OK, but they will then forever behave erratically - and this will result in the 6.5's characteristic hiccups, stumbles, cut-outs, hard starting and many other symptoms of impending complete PMD failure.  You can find evidence of this by viewing the middle contacts on the PMD cable - has "bluish" contacts - from high amperage flowing through.  It should also be noted that you risk burning up the fuel solenoid itself with a weak lift pump and that is the major cause of many IP rebuilds.  See also  for how to stop that.

4.  Low fuel pressure means the Optical Sensor is also not immersed in fuel and in fact there may be "foaming fuel" in the sensor wheel which is read at the top of the IP just before the return valve, this may throw errors like

Diagnostic codes OBD I
DTC 17 - High Resolution Circuit Fault
DTC 18 - Pump Cam Reference Pulse Error
DTC 35 - Injection Pulse Width Error (Time Short)
DTC 36 - Injection Pulse Width Error (Time Long)
DTC 54 - PCM fuel circuit error

On OBD-II vehicles the code will have a "P", "P0" or "P1" or "P12" in front of it.  A common one on OBD-II vehicles is the code P0251.  This does not mean the Optical Sensor is absolutely bad needing replamcnment.  See for instance  The first place one should ALWAYS start is with the lift pump - and its PRESSURE - not just looking at fuel flow; and a clear fuel system without clogged fuel filters.

All of these are "Optical Sensor" codes and can be caused by "Dark Fuel", or "foaming fuel" as a result of weak fuel pressure also or your own fuel.

5.  You will get poor performance or acceleration, assuming you are able to get it started to run at all.

What suffers and fails is the PMD, and there is nothing wrong with it other than the Power Tanssistors are damaged beyond operationality and / or  reliability.

The PMD (pump mounted driver) is that small black box originally mounted on the side of the DS-4 Standyne  injection pump. It is a signal amplifier that powers the fuel solenoid just like a fuel injector driver does in a gasoline engine ECM. It contains 2-250 watt capable transistors which create a lot of heat when worked HARD. Stanadyne designed this to be mounted on the side of of the DS-4 Injection Pump when there is supposed to always be a large cool pool of fuel oil flowing past there to draw the heat of of the transisteros.  

It matters not that the DS-4  injection pump  is mounted in the engine valley below the intake manifold so much as it is mandatory that a cool pool of fuel keep circulating to cool the IP and the PMD to take the heat back to the fuel tank where it is dilluted by a larger pool of fuel in the tank.  As most people know, electronics do not do well under  heat and they will fail prematurely. Symptoms of failure are stalling, hard starting, surging, poor fuel mileage, erratic idle/throttle and finally no-start. When they go it usually will not give any codes with the SES (Service Engine Soon) light.

So if you have a relocated PMD it is likely running hotter where it is than if it were on the side of a properly fueled under pressure, DS-4 IP, recirculaing fuel back to the tank . . . and anyway . . . 

We can assure you that a PMD [FSD] on the side of a properly fueled under pressure in excess of 5 psi at all times IP whether at idle or under wide open throttle - will NOT fail, because the check engine light will show FIRST when fuel temperature reaches 195 degree F.

 When a diode or a transistor fails, one of two things usually happens: A junction (or junctions) go short circuit (its resistance becomes very low or zero). A junction (or junctions) go open circuit (its resistance becomes very high or infinity).

Thermal overstress — a.k.a. "excess heat" — can and WILL cause semiconductors to fail. Excess heat melts materials, chars plastics, warps and breaks semiconductor dies, and causes other types of damage. In general, devices should not operate with a junction temperature above 125–150°C.

150°C is about 300°F - and under a hood that is easily reached.  BUT . . .  believe it or not with the PMD mounted on a properly fueled - as in proper fuel pressured DS-4  Injection Pump - even located where it is -- it does not get over 150°F - that is about 65°C - because the fuel is constantly recirculating and the Optical Sensor is also a Temperature Sensor and it would throw an "overheat" fuel code above 194°F - whichi about 94°C.

Semiconductor devices should operate within the range of voltage, current, and power limits established by the devices’ manufacturers. These limits exist for both power and I/O connections to a device. When a device operates outside this “safe operating area” (SOA), electrical overstress (EOS) can cause internal voltage breakdown that can, in turn, cause internal damage that ruins the device. If the EOS produces a higher current flow, the device can also overheat, adding thermal overstress to the causes of failure. The added thermal stress leads to a secondary-mode failure, named because the thermal stress arose from the primary EOS.

A PMD mounted on an aluminum plate with cooling fins - can easily get OVER that safe heat range especially if NOT in good AIR FLOW by just how it operates.  Mild "Heat Soak" normally will not hurt a semiconductor - if sitting - and not powered, but using it as a switch - as it is in the PMD causes heat especially when the fuel solenoid is working it hard.  So . . . they fail.

The worst thing you could actually do is mount the PMD on that cooler plate in the relocation kit - but anyway be that as it may be it works  . . . the easiest way to repair one is replace the Power Transistors and the PMD will be good as new again - assuming nothing else is wrong with it.

You are welcome to try to get the transistors out yourself - and good luck - because you need special tools to do so without damaging the PMD itself.  Even sometimes we cannot get them out without damaging it - and if we damage your unit we will refund your money - but if you want to go out and buy the tools to replace them yourself and buy the transistors you wil spend as much as our service.  We have repaired the same PMD over five times over four years and it worked fine each time, until we discovered a way to keep it even cooler with a fuel line cooled mounting plate; and guess what . . . it has not failed again.

We test the repaired PMD before returning it to you by on an actual 6.5, diesel and you can verify they are replaced because the marked transistors you sent in are gone and returned.

You can either mark them with red fingernail polish or paint or drill a small hole in the back and do not go more than a hole to pierce just the outer cap.

OBVIOUSLY, this service is meant to be used for a spare PMD you have blown already and can do without for a while.

Turn around is normally 72 hours - unless we run out of transistors and have to wait on a new supply order of them.  We follow the FTC Mail Order Rule and if it takes more than 30 days to turn your item around back to you - will notify you or refund you if you request.

The price is set to include the LPBMFB shipping amount of $14.95 which is the default on the website so $25.00 plus $14.95 equals $39.95.  Service is SOLD BY BITCOIN PAYMENT ONLY

Service consists of :

Service includes professional replacement of  the Two Power Transistors seen on the bottom of the PMD with new ones and return to you by US Mail.

This item service  is NOT RETURNABLE, or REFUNDABLE and is NOT guaranteed, as the other thing that can go wrong is to blow the internal voltage regulator which we will NOT replace; and no warranty applies    It cannot be told if the power regulator is blown until  repair is made.


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Weight: 0.75 lb
Price: $25.00
SKU: PMD_repair