Engine is not cranking over?

Tiny
RICHARDBROWN_26
  • MEMBER
  • 2006 CADILLAC DEVILLE DTS
  • 6.2L
  • V8
  • 260,000 MILES
It started up fine when bought but found out that there were wires running from the fans to the ECU fuse. When removed it wouldn't start. It also had an ECU code before it wouldn't start. I was thinking it was the ECU by passing the alarm system to start. I also replaced wiring harness from fuse box to ECU and engine components.
Saturday, February 27th, 2021 AT 1:09 PM

6 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,747 POSTS
So when you say we removed it do you mean the fuse or the wire? there is no way to bypass the security system so it sounds like they were trying to make the fans work anyway they could. can I ask if the security light is flashing when trying to start it? if so this guide can help us fix it:

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

Please run down this guide and report back.
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Sunday, February 28th, 2021 AT 7:31 PM
Tiny
RICHARDBROWN_26
  • MEMBER
  • 8 POSTS
I had removed the wires they had running to the fans that was leading back to the fuse box to the ECU fuse power for the fans. When I removed those wires it stopped starting, but it had shut off on me once when switched to reverse then didn't want to start until I hit neutral. Which will indicate a starter going bad, but got it tested and starter is fine and battery has been disconnected for a year now.
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Monday, March 1st, 2021 AT 7:00 AM
Tiny
RICHARDBROWN_26
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  • 8 POSTS
I actually have the codes it was throwing p0036, p0054, p0690, p0141and p0455.
Just found them.
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Monday, March 1st, 2021 AT 1:39 PM
Tiny
KEN L
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  • 50,747 POSTS
These codes wont make the engine not crank over but these cars have a problem with the sifter rod. Here is how you can fix it. Check out the diagrams (below). Please let us know what happens. This guide can help too:

https://www.2carpros.com/articles/starter-not-working-repair

Check out the diagrams (below). Please let us know what happens.
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Monday, March 1st, 2021 AT 2:04 PM
Tiny
RICHARDBROWN_26
  • MEMBER
  • 8 POSTS
The shifter cable is working fine transaxle is in park.
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Wednesday, March 3rd, 2021 AT 9:36 AM
Tiny
KEN L
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  • 50,747 POSTS
Let run the codes to see what comes up.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down this guide and report back.

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Friday, March 5th, 2021 AT 8:51 PM

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