2006 GMC 6.6L Codes

[JJVelozo]

Hello,

I am new to the diesel world and just picked up a 2006 GMC Sierra 2500HD V8 6.6L that has lights and codes going off. I have a P0540 : Intake AIr Heater Feedback Circuit, P0674 : Cylinder 4 Glow Plug Control Circuit, Air Bag, and ABS (which I replaced the Passenger side already because the kid had 37 on it and it ripped off the ABS cable. Driver side looks clean and fine but not 100% sure. Then I have a clear substance dripping from the Allison 1000 Transmission where it mounts to the engince block. Well thats a mouth full. Any Assistance would be great.

Thank you

 

[Ron Nielson]

Look up your codes here: https://www.dtcdecode.com/Chevrolet

 

[gmduramax]

Is the speedo correct with the 37’s on it? If it is and the abs module wasn’t adjusted for the tire size change it’ll throw the abs light.

 

[TheBac]

Moved to LBZ section.

 

[JJVelozo]

Is the speedo correct with the 37’s on it? If it is and the abs module wasn’t adjusted for the tire size change it’ll throw the abs light.

I replaced the 37's with 285/70/17's. The 37's were just over kill and i have not been in my 20's for several years now. lol

 

[gmduramax]

I replaced the 37's with 285/70/17's. The 37's were just over kill and i have not been in my 20's for several years now. lol

So is the speedo correct now? Or did you have to correct it?