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After replacing the ECU, the car does not start?

Tiny
ORIGAMIPRISM
  • MEMBER
  • 2013 CHEVROLET MALIBU
  • 2.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
I recently replaced my ECU and ever since my car won't start. Dashboard lights blink, radio comes on, and the anti-theft light turns off. I've tried searching for the cause online, but my efforts are fruitless. I just want to know what the issue is and how to fix it.
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Sunday, August 20th, 2023 AT 5:28 PM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,536 POSTS
Was the ECU pre-programmed before installation? If not, this is your problem. Here are instructions on how the job is done correctly. Check out the images (below). Please let us know if you need anything else to get the problem fixed. You can get a pre-programmed unit by searching Google or Ebay.
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Monday, August 21st, 2023 AT 1:15 PM
Tiny
ORIGAMIPRISM
  • MEMBER
  • 2 POSTS
Yes, the unit was preprogrammed. From what I've searched, the anti-theft light would stay on if the until wasn't programmed correctly, but unfortunately that isn't the case.
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Tuesday, August 22nd, 2023 AT 5:45 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,536 POSTS
Did the engine start before? Can I ask why you replaced it?
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Thursday, August 24th, 2023 AT 10:04 AM

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