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Re: Will a 2003 ecm work to replace in a 2004 Cadillac...
No... All ecm (s) are make model, year, and vin specific. They must be flashed with the correct information which includes engine, accessories , sensor, etc for the specific car... The car will not start.
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Unless the ECM has been damaged, it should do a complete reset when power is removed and reconnected. Disconnect the negative lead on the battery, carefully check all the plugs on the ECM, wait a few minutes and then reattach the battery cable.
The same thing happened to my 03 CTS. The camshaft position sensor code is often thrown for a variety of reasons. In my case somehow the ECM went when the timing belt jumped (after the serpentine belt broke). It was a bear to diagnose but after installing a rebuilt ECM it runs great. (Don't make the mistake I made: the cylinder head gaskets will fit nicely on either side but if not placed on the correct sides you'll block the single oil port which provides engine oil to the head)
These cars are silly....what happened to Cadillac.....jeez....it's a damn shame....all the cts's are just **** it seems....I think all of them are here in the forums being diagnosed....cause dealerships are crooks....the world needs a *******....I think it's getting one too....lol
If the ECM was replaced properly it have no efffect on the engine starting. If the starter is turning the engine over then it's doing all it was designed for. I think I would get it out of that shop. I smell a rat over the internhet. Gillight
Unfortunately, is either a faulty ECM or with the ECM wiring. Check the connectors at the ECM with the negative battery cable disconnected. Are there any other DTCs?
Hi,
If your portable remote is not work , you may need to replace the battery with new one. If it not work , you need to disconnect power supply into your security system / immobilizer / anti theft.
Regards, Jay
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