Check the listing for details. Silverado 1500 2003 4.3L Engine Computer PCM ECM 12581565 Programmed to your VIN. Condition: Used. Listed at 129.90 USD. This auction is for one 12581565 PCM (also known as ECM, ECU, Engine Computer, Powertrain Control Module) that will arrive at your door ready to install with the proper calibration programmed to your specific vehicle. Fits the following applications: 2003 CHEVEROLET SILVERADO W/ 4.3L Engine with Automatic Transmission 2003 CHEVEROLET SILVERADO W/ 4.3L Engine with Manual Transmission 2003 GMC SIERRA W/ 4.3L Engine with Automatic Transmission 2003 GMC SIERRA W/ 4.3L Engine with Manual Transmission ***GM used three different computers in the 2003 application with the 4.3L engine . You can correctly identify the computer by looking at the tag on the back side of the computer. You can view the tag of the computer by releasing the computer from the plastic mount. You don't need to disconnect the battery or remove the plugs of the computer to do this. If your computer has the SERV NO of 12581565 then you can proceed with the purchase through this listing. If the SERV NO on your computer is 12576106 or 12582605 please visit our store and then search for 12576106 or 12582605 in the search box and then make your selection from the search results. *Programmed to your specific vehicle – shipped to your door ready to install *1 year replacement guarantee – no hassle *No core charge –you keep your existing ECM *We ship the same day or the following business day from receipt of payment and VIN- item is in stock and ready to ship. ********** You can send us your 17 digit VIN (vehicle identification number) at the time of payment in the "notes to seller"or you can send us your VIN through the eBay message system after you make your purchase. ******GM installed this 12581565 PCM in all of the above applications. This was possible because each of these models received their specific programming from the factory. In other words, you can't simply swap a used PCM from one vehicle to the next. We are a licensed user of the same GM software that a GM garage would use to reprogram and update your computer. With your purchase we will reprogram the ECM, with the latest software updates available from GM, to your specific vehicle using your VIN (vehicle identification number). ******This computer is used and was removed from a running salvaged vehicle. This ECM comes with a 1 year replacement guarantee. We have been in the ECM business for 17+ years. We are also a 17+ year eBay member with Excellent positive feedback. Other info: Why buy your spare ECM from us? You will be purchasing a high quality used ECM. You get free Flash programming with every OBDII GM computer purchased. OBDII type computers have the “chip” imbedded into the ECM 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 an ECM whether it is a used ECM or a remanufactured ECM. 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 reprogram any OBDII computer purchased from us with your specific VIN number for the latest updated calibrations straight from GM for a stock calibration. This is important to ensure specific vehicle programming and to guarantee flawless performance in your vehicle. At the end of the auction you will need to provide us with your VIN number. The core charge alone for the 12581565 PCM from a GM Dealer will cost you more then our total purchase price. There is no core charge with this auction. This is a great opportunity to own a spare PCM. Bid now and save. ******View our e-bay store for more pcm's. 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 ECM. If you are looking for different computer check out my other items in our store. *The picture is a representative of the 12581565. The item that you will receive is guaranteed to be of the same quality of condition. After purchasing, pay instantly with your credit card through PayPal!