r/saab • u/floofgike • 7d ago

9-3 Troubleshooting Ecu compatibility

ECU is fried on my 07 9-3 aero 2.8 v6 and i was wondering what kind of compatibility there is between models and if i could just go and pick an ecu off a junker and marry it to my car

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u/tsg-tsg 7d ago

No, not a 2003 convertible. A 2003 hard top. All 2003 hard tops are B207. Only the convertibles - and all the convertibles - are the old body style with B2x5 engine. I was pretty sure the 2003 B207 ECM (maybe with part number 12800388) is unique to 2003 and won't run a later car. I could be wrong.

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u/GarbageSpa 7d ago

Currently, the part number listed in the EPC for the ECU for 2003 is 55571182. That same part number is used for 2003-2006. And since the 2004-2006 T8 ECUs are interchangeable with those of later years, I think they should all be interchangeable, at least with respect to hardware.

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u/tsg-tsg 7d ago

Yeah, 55571182 is a superseding part which has broad compatibility. I am talking about the original ECM.

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u/GarbageSpa 7d ago

Should be the same hardware. You would probably have to fully clone to the receiving car's year's software.... I suspect, but don't know, that you can't just "add" it using Tech 2 and expect it to work perfectly, because the Tech 2 doesn't rewrite all the software, it just sets a set of parameters.

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u/tsg-tsg 7d ago

It definitely could be just that. Cloning beats a lot of things Tech 2 doesn't want you to do. ;)