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After replacing the ECM, the car will not start?

Tiny
BRENDA-LYNN
  • MEMBER
  • 2002 BUICK RENDEZVOUS
  • 3.4L
  • 4WD
  • AUTOMATIC
  • 164,000 MILES
Replaced ECM. All the lights on dash are now out but car won't start.
Monday, January 30th, 2023 AT 2:52 AM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,536 POSTS
When you say the car won't start do you mean the engine won't crank over (starter) or the engine turns over but does not run? Please check out this guide to help us get started on fixing the problem:

https://www.2carpros.com/articles/car-cranks-but-wont-start

Please go over this guide and report back.

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Monday, January 30th, 2023 AT 10:21 AM
Tiny
BRENDA-LYNN
  • MEMBER
  • 2 POSTS
It won't turn over.
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Monday, January 30th, 2023 AT 10:24 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,536 POSTS
Thank you, can I ask if the security light is flashing when you try to crank it over? Also was the ECM programmed before you installed it or how exactly did you replace the ECM?

https://www.2carpros.com/articles/how-to-reset-a-security-system

Please go over this guide and report back.
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Monday, January 30th, 2023 AT 5:33 PM

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