Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hello and thank you for your question Ron,anytime you replace the ECM it dose require flashing and this needs to be done before the install .Once you have done the programming you can run the relearn procedure so the new ECM can learn the keys. If the computer has been flashed then try running the relearn procedure. See it in the link below, copy and paste the link to your browser to see the steps.https://dl.dropboxusercontent.com/u/104923897/Re-learn%20Jun%2027.pdfPost back if you have more questions and or need more help.