SPONSORED LINKS

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

Tiny
DAVEJ7392
  • MEMBER
  • 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 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Lets back up. Was this an issue prior to the engine replacement?

Roy
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Thursday, July 5th, 2012 AT 5:47 PM
Tiny
DAVEJ7392
  • MEMBER
  • 4 POSTS
Nope I cracked a piston so I did a short block
Was this
answer
helpful?
Yes
No
Thursday, July 5th, 2012 AT 6:01 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
If it was grounded it would be on all not just 2. Did you have the injectors serviced while they were out?
Roy
Was this
answer
helpful?
Yes
No
Thursday, July 5th, 2012 AT 6:08 PM
Tiny
DAVEJ7392
  • MEMBER
  • 4 POSTS
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
Was this
answer
helpful?
Yes
No
Thursday, July 5th, 2012 AT 6:13 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 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
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Thursday, July 5th, 2012 AT 6:19 PM
Tiny
DAVEJ7392
  • MEMBER
  • 4 POSTS
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
Was this
answer
helpful?
Yes
No
Thursday, July 5th, 2012 AT 6:23 PM

Please login or register to post a reply.

Related Engine Runs Rough Content

Is it Safe to Drive Check Engine Light?
VIDEO
Is it Safe to Drive Check Engine Light?
Instructional repair video
Check Engine Light
GUIDE
Check Engine Light
Why is my check engine or service engine soon turned on? In this guide we talk about what this is associated with this notorious light, what it is used for and what you...
VIEW MORE

Sponsored links