This E.C.M. fits the following vehicles: 2004 4.8/5.3/6.0/8.1L GMC Sierra
(1500, 1500HD, 2500. 2500HD, 3500).

This auction is for one service number 12586242 ECM (Engine control module) that is programmed for your vehicle

using the latest software updates using your V.I.N. (Vehicle identification number) to exactly

match your vehicle. After you purchase the E.C.M. you will need to provide us with your V.I.N so that

we can program the E.C.M.

There is no core charge you keep your old
E.C.M.

Two things may have to be done after you install your E.C.M. First an anti-theft relearn may have to be
performed. If this is the case the truck will not start.

The second thing is that a crankshaft variation relearn may need to be performed once the vehicle is

running. This will be evident if the check engine or service engine soon light comes on once the vehicle

is running. You will need access to a scan tool capable of doing this procedure to do this and clear any related trouble codes (Code

P0315). If this is not available to you a repair shop will have to perform this and clear the

related trouble code. The vehicle will run normal but the ”service engine soon” light will come on and a

trouble code will be stored until this is resolved.

Instructions for both procedures will be included.

We will within one business days of payment.

Same day ping if ordered before 2:00 P.M. EST (Mon. - Fri.)

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2004 GMC Sierra Engine computer 12586242 "Programmed to your VIN" ECM PCM ECU

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