New ECU installed now it will not start

KEVIN STINEMATES

MEMBER
2011 CHEVROLET EQUINOX
2.4L
4 CYL
2WD
AUTOMATIC
116,000 MILES

I have had trouble with my ECU so I bought a replacement unit and installed it. When I turn the key all the lights come on but it wont turn over at all and the check engine light is flashing. Is this possibly because of my keys not being set to the new ECU? The company I bought this ECU from had set it to my VIN number do I still have to do the keys?

7 Replies

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Hi,

The process for key relearning doesn't involve the ECM. What did the manufacturer tell you? Also, was the car's battery disconnected when the new ECM was installed?

Let me know.
Joe

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Saturday, December 14th, 2019 AT 7:34 PM

KEVIN STINEMATES

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3 POSTS

Yes, I disconnected the battery while switching the ECU out. I put the old one back to see if it would work and it did. Do I need to have the new ecu reprogrammed? When I ordered the new ecu I was told this should be a plug and play type of install but when I switched them and turned the key all the normal dash lights came on but it did not do anything else. Just flash the check engine light.

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Saturday, December 14th, 2019 AT 7:42 PM

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

I think you got a faulty part. Is there a theft light flashing?

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Saturday, December 14th, 2019 AT 10:32 PM

KEVIN STINEMATES

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3 POSTS

No there isn't a theft light flashing. I did go through the process of trying to see if that might be the problem but it didn’t work either. Thank you for your help. I will have to call the company where I bought the ECU from.

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Sunday, December 15th, 2019 AT 2:38 AM

JACOBANDNICKOLAS