2001 engine swapped with 2004 same base model

DODGER420

MEMBER
2001 CADILLAC DEVILLE
4.6L
V8
RWD
AUTOMATIC
95,000 MILES

Hi. My 2001 Cadillac deville North Star 4.6L 32 valve Y has compression in the coolant reservoir so I swapped engines with A 2004 Cadillac Deville with the same specs. From the 2004 I took the entire engine and transmission the wiring harness And fuse engine fuse box and brain. Mechanically everything is done but the electrical need something. It won't start. Both fuse boxes just click when I tried to start it. Here's a list of the codes that it's giving on mfy onboard obd. AMP u1000, DDM B1913, B1327, B0429, STM B0026, PCM P0315, PDM U1714. Hopefully you can help!
Thanks
Patrick

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1 Reply

RACEFAN966

MECHANIC
5,029 POSTS

Well it looks like the computer is incompatable with your car. It cant understand the other modules on the car as it is programmed for the car it came out of down to the vin number. It don't see heated seats and can not communicate with the data link and so on. I would try putting the old computer back in and see if starts before going to far otherwise you will have the computer from the 2004 reprogrammed.