Several trans codes when cold

[04gmcdmax]

when i move my truck out of the driveway and sometimes when it is sitting idling without moving. the truck will start moving a little and then stop and wont move anymore and i get 4 codes they are p0700, p0841, p0843 and p0848. but once i restart the truck it moves fine this only happens when it is cold once its wrmed up its fine. any help would be great thanks.

 

[Mike L.]

Need more info. What year, who built it, what power level, what kind of abuse if any.
You know; the usual important things to diagnose.

 

[04gmcdmax]

its an 04 lly it was built by a buddy of mine the trucks makes just shy of 500 horse it doesnt take much abuse a couple of sled pulls and a couple trips down the drag strip and the occaisional full throttle on the street

 

[Mike L.]

Possibly a bad Pressure switch manifold or an NSBU slightly out of ajustment.

 

[04gmcdmax]

ok ill check it out thank you

 

[BoostEEd]

Check your fluid level, you lost prime.