Can't Flash ECM but Flashes TCM Fine

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December 21st, 2019
jrflasher

Can't Flash ECM but Flashes TCM Fine

Hey All,

I am trying to flash a Cruze 1.4ltr. The ECM was just replaced and Autocal licenses have been updated to allow additional VIN slot. It registers the new VIN and flashes without any errors. But the car will not start. If I apply the stock tune back on the car starts up fine. I can flash the TCM without any issue. Before the ECM was replaced I was able to flash it without any issues using the AutoCal. I have tried using EFILive software and the result it the same. The car has power and lights up but will not start.

Any ideas what could be causing this?
December 26th, 2019
ScarabEpic22

Have you talked to your tuner? There are so many ways to configure an AutoCal, we're shooting in the dark here trying to troubleshoot. Sounds like there's an issue with the tune file if you can successfully flash it, yet the car doesn't start, but immediately with the stock tune, the car starts. Points to the tune file IMO.
December 26th, 2019
jrflasher

Thanks for your response. I reached out to my tuner. He was confused as to why it did not throw errors and I have not heard back from him. He's hard to get a hold of. The tune file worked fine before the ECM was replaced. I was able to tune and revert back to stock as needed for dealer visits, etc. Is there a chance that replacing the ECM requires a new file? Can my tuner 'read' the ECM to figure out what is stopping it?
January 3rd, 2020
ScarabEpic22

Depends how he setup the file locking, but it shouldnt "complete" the flash then cause a no-start condition. Sounds like there may be a calibration mismatch or something. Unfortunately, you'll need your tuner to resolve these issues. I'd ask him to take the new, stock file from your ECM and create a new tune calibration from that.
January 3rd, 2020
jrflasher

Quote:

Originally Posted by ScarabEpic22

Depends how he setup the file locking, but it shouldnt "complete" the flash then cause a no-start condition. Sounds like there may be a calibration mismatch or something. Unfortunately, you'll need your tuner to resolve these issues. I'd ask him to take the new, stock file from your ECM and create a new tune calibration from that.

Thank you, we were able to flash it. My issue is resolved