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2007 is a change over year.  There are 2007 Classic and 2007 New body trucks.  All the new body trucks had a Generation IV engine, and the Classic and prior were all Generation III engines.  Major changes took place in the electronics that control the engine & transmission.  2007 Classic and prior had a PCM, or Powertrain Control Module.  2007 New body, have a ECM and a TCM.  (Engine Control Module and Transmission Control Module.)  One computer controls engine, the other the transmission.  In vehicles equipped with a 6 speed automatic, the TCM is located inside the transmission its self.

 

I do currently offer programming for the E38 style ECM only...$150 including return shipping...  Click Here.

E38 ECM, used in 07+ New Body Pickups with 4.8, 5.3, 6.0, 6.2 engines. For 58x crankshaft reluctor engines.

E40 ECM, used in 2005 LS2, maybe others. For 24x crankshaft reluctor engines

E67 ECM, use in a lot of 06+ Cars with v6 & v8's. For engines with 58x crankshaft reluctor.