Brought my car to dealership to program new ECM, but it still will not start and mechanic cannot figure out why it will not start still.
Aug 21, 2018 at 2:50 PM
Programmed new ECM will not start
2005 CADILLAC CTS
KWHITE0818
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Can I ask if the security light is flashing?
Feb 2, 2019 at 1:18 PM
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I replaced the ECM as well and my security light is flashing.
Jun 4, 2019 at 10:53 PM
That is the problem then the PCM must not be programmed to the car correctly. I would try to get a replacement coded with the VIN number or tow it to a shop that can do it. should cost about $130.00. Let me know
Jun 5, 2019 at 4:10 PM
That still didn't work, the tester doesn't even work on the car .
Jun 26, 2019 at 10:55 PM
Just to jump in on this, if the PCM will not communicate with the scan tool then the PCM you have is faulty or you have a power or ground issue going to the PCM.
So, we are going to need to start with checking all power and grounds to the PCM. I suspect these will be fine since the engine is cranking so we need to suspect that the PCM you replaced is faulty.
https://www.2carpros.com/articles/how-to-check-wiring
What was the reason you replaced the PCM in the first place? Do you still have the original and can you install it and see if the engine starts?
Let us know what you find. Thanks
So, we are going to need to start with checking all power and grounds to the PCM. I suspect these will be fine since the engine is cranking so we need to suspect that the PCM you replaced is faulty.
https://www.2carpros.com/articles/how-to-check-wiring
What was the reason you replaced the PCM in the first place? Do you still have the original and can you install it and see if the engine starts?
Let us know what you find. Thanks
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Mar 14, 2022 at 4:35 PM
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