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FAQ: GM Flashing RED and YELLOW

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If the RED and YELLOW flash during programming after cyling the key to the ON position, do this.


  1. Turn car off
  2. Plug in ONLY the RED connector in the EVO
  3. Start car and let run 5 secs.
  4. Shut down car.
  5. Do NOT disconnect RED connector
  6. Wait 20-30 Seconds
  7. Start programming
closed with the note: faq
asked Jul 15, 2020 in FAQ by Robb (260,460 points)
closed Oct 15, 2020 by Robb