![]() When ordering a new ECM make sure ALL numbers match and check everything 4 times and have someone with a fresh pair of eyes check. Also there is a 4 letter code at the top right that also needs to be the exact same for example my old ECM was ABMX but my new ECM was ABVT. It's the middle 8 numbers at the top and needs to be exactly the same as your new ECM. The hardware code is identical to the part/service number and may appear to be the correct ECM but is heavily different. So after some research I've discovered these Chevy Malibu ECMs have a part number, a service number, and a hardware code. ![]() If the light never turns off just switch after 10 minutes but usually this means something is wrong. Normally the security light is solid during the 10 minutes and when you see it go out then its ready for next step. Turn key off then back to "ON" (do not crank) and leave there for a final 10 minutes.(not a second less).Turn key off then back to "ON" (do not crank) and leave there for another 10 minutes.(not a second less).Insert key and turn ignition to "ON" (do not crank") leave there for 10 minutes.The dash going out during crank is pretty common on GM, I would only investigate further if you still have trouble after programming immobilizer. ![]() Elsewhere then you must use a good diag tool. In the US there is a manual procedure you can do. Turn your key to "ON" position and look at your instrument cluster, You will see a padlock symbol lit solid. It needs to be done while connected with your immobilizer module and key so can not be done remotely like your supplier did for flashing the VIN and calibrations. After flashing the replacement ECU with proper VIN and calibrations you need to also program the immobilizer to store the sync codes in the replacement ECU. ![]()
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