what Happens if the ficm gets grounded will it cause the truck to run bad

2002 GMC SIERRA
185,000 MILES
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DAVEJ7392
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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
Jul 5, 2012 at 7:20 AM
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ASEMASTER6371
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lets back up. was this an issue prior to the engine replacement??

Roy
Jul 5, 2012 at 10:47 AM
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DAVEJ7392
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Nope I cracked a piston so I did a short block
Jul 5, 2012 at 11:01 AM
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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
Jul 5, 2012 at 11:08 AM
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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
Jul 5, 2012 at 11:13 AM
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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
Jul 5, 2012 at 11:19 AM
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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
Jul 5, 2012 at 11:23 AM
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