Montana 2005 3.5L Engine Computer PCM ECM 12591279 Programmed to your VIN for Sale


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Price: $89.95

This auction is for one12591279 EngineComputer (aka PCM, ECM, ECU)that will arrive at your door ready to install with the proper calibration programmed to your specific vehicle.

Fits the following application:



2005 PONTIAC MONTANA 3.5L ENGINE



***This unit will only fit the 2005 Montana. If you have the same part number on your computer but are needing it for a different application you will need to purchase through the correct listing. Please visit our store for more applications.



*Programmedto your specific vehicle VIN

*Shipped to your doorready to install

*1 YEAR Replacement Guarantee– no hassle

*No core charge–you keep your existing PCM- no extra trips to the post office

*We ship the same day or the following business day from receipt of payment and your 17 digit VIN -item is in stock

************** You can send us your 17 digit VIN (vehicle identification number) at the time of payment in the "note to seller" or you can send it after your purchase and payment by contacting us through the ebay message system. We can't ship your computer until we receive your 17 digit VIN.

******GMinstalledthis 12591279 PCM in the above application as well as several other GM models. This was possible becauseeachof these models received their specific programming from the factory. In other words,you can't simply swapa used PCMfrom one vehicle to the next. With your purchase, we willprogramthe PCMto your VIN (vehicle identification number) with matching software.


******ThisPCMis used and was removed froma running salvagedvehicle. This PCM comes with a 1-yearreplacement guarantee. We have been in thePCM business for17+ years. We are also a 17+ year eBay member with an Excellent positive feedback score.

*******No computers are "plug and play"Upon installation you will need to perform the security system relearn procedure (also known as +Passlock* relearn or the theft system relearn). The security relearn is an on vehicle relearn to your specific vehicle and is what allows the vehicle to accept the replacement computer and start the vehicle. It is an on vehicle relearn so it is not something that can be programmed outside the vehicle. It doesn't require any special tools and is essentially turning the ignition key on and off in a sequence. I supply you with the step by step instructions on how to complete this.
Once the vehicle starts you would need to complete any other on vehicle relearn procedures necessary for your vehicle. This may include but not limited to an idle relearn, drive cycle relearn, or CKP relearn(crank position relearn P0315/ / P1336). The CKP relearn requires the use of a shop level scan tool. If you are not clear on the complete removal and installation process for the computer for your vehicle please check the service repair manual for your vehicle or allow a certified technician to install the computer for you.


Other info:

Why buy your spare PCM from us?You will be purchasing a high quality used PCM.You get free Flash programming with your purchase. OBDII type computers have the “chip”embeddedinto the PCM and it is not removable.The calibration file per the application is “Flashed,” or reprogrammed using a software package and a pass through device.The “chip” is no longer removed for programming.Proper programming is essential when replacing a PCM whether it is a new, used or remanufactured PCM.A used GM computer will have the software installed that pertains to the original vehicle that it was removed from.In some cases, GM OBDII type computers will interchange with many different vehicles including those with different engine and transmission configurations.However, unless the computer is programmed with the correct software it won’t function properly upon installation.We will flash program thecomputer purchased from us with your specific VIN number with matching software for a correct match to your vehicle. This is important to ensure specific vehicle programming and to guarantee flawless performance in your vehicle.

There is no core charge with this auction. This is a great opportunity to own a spare PCM. Buy now and save.


******View our e-bay store for more computers.

Many different names have been given to the engine computer since its inception over 30 years ago. Engine computers may be referred to as ECU (engine control unit), ECM (engine control module), PCM (power train control module), Brain Box, ECC (engine control computer), VPCM (vehicle control module), or Fuel Management System. For clarification we refer to an engine control computer as an PCM.

*The picture isof arepresentative of the 12591279 from our inventory.Item will be of like finish guaranteed.


+Passlockis a registered trade mark of GM Corporation. We are not assocatiated in any way with GM Corporation.
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