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

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

6 Replies

Tiny
ASEMASTER6371
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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
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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
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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
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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
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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
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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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