WHAT HAPPENS IF THE FICM GETS GROUNDED WILL IT CAUSE THE TRUCK TO RUN BAD

  • Tiny
  • davej7392
  • 2002 GMC Sierra
  • 185,000 miles

I just did a new short block and new injectors in my 2002 duramax and now number 2 and 7 are showing +15 and all the rest are showing -7 and I was wondering if I had the ficm grounded if it would cause this

Thursday, July 5th, 2012 AT 2:20 PM

6 Answers

  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

Lets back up. Was this an issue prior to the engine replacement?

Roy

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Thursday, July 5th, 2012 AT 5:47 PM
  • Tiny
  • davej7392
  • Member

Nope I cracked a piston so I did a short block

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Thursday, July 5th, 2012 AT 6:01 PM
  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

If it was grounded it would be on all not just 2. Did you have the injectors serviced while they were out?
Roy

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Thursday, July 5th, 2012 AT 6:08 PM
  • Tiny
  • davej7392
  • Member

They are brand new injectors the truck is in Limp Mode when it dose that and I was wondering if that the ficm being grounded could cause it to be in limp mode

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Thursday, July 5th, 2012 AT 6:13 PM
  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

Yes, it definitely could be. I would re check your wiring to confirm and let a shop with a scan tool verify this before throwing the ficm at it.

Roy

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Thursday, July 5th, 2012 AT 6:19 PM
  • Tiny
  • davej7392
  • Member

I have my own scan tool but the codes it sets off are just cause of the truck being in limp mode. Any thing else that would cause this that u can think of

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Thursday, July 5th, 2012 AT 6:23 PM

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