Engine/Transmission (1998.5 - 2002) PCM Compatibility by part number P56040286AD vs P56040286AC 2001.5 2500 4x4

[SnoKing]

My truck has had an Overdrive button problem with the PCM not taking it out of OD when you push the button for a number of years. Light in dash lights but it will not drop the OD solenoid. Work around has been the DTT smart controller and manual OD switch.

PCM is part number P56040286AD

Will part number P56040286AC interchange on this truck, I bought this PCM from another member. It is a 2001.5(rear dish brakes) 2500 4x4 Auto standard cab without the factory alarm or remote for the door locks.

It is my understanding that I have to fine someone to flash the VIN and mileage into a replacement PCM, is that correct? Suggestions on where to get this done?

If these will not interchange then I will have a P56040286AC for sale!!!

SNOKING



Some things I learn about the PCM problem. The OD Solenoid has battery voltage on one side and the PCM's circuit grounds the other side to shift to OD. On my truck the PCM OD lead when switching out of OD would not go to float(battery voltage) when you switch out of OD. It stays at around 10.7 volts and that is enough voltage difference to keep it from dropping the OD solenoid. So I installed a series of diodes in the line to cause additional voltage drop and have the button working again, however I would like to get it fix right for once on all.

 

[mwilson]

I think that they are one in the same..my Dodge link does not recognize the AC as a valid part number. Probably a supercession.

I did find this...read the numbers beside the stock code....

http://www.moparpartsoverstock.com/p/__/MODULE-Powertrain-Control/6839327/RL040286AD.html

Mike.

 

[SnoKing]

Thanks Mike. Chris

 

[mwilson]

The re-flash question I can not help with, maybe a PM to Bob 4X4 would do it....