Hello and welcome to JustAnswer!
P0700 sets in the engine controller when there is a code stored in the trans controller. This one is just informational and tells you to read the trans codes in the TCM. Do you know what other codes were stored besides the P0700?
P0700 was the only code i found but only checked engine codes. Can check trans code tomorrow
That's what we'll need to do to see what is going on with it. If you can have the rest of the codes read and then come back and post them here I'll be able to tell you what is going on with it.
Just come back and reply to this question just as you have been tonight. I'll get notification that you replied and we'll pick it up from there.
What did you find out?
Which engine do you have in your truck?
That's close enough then. Six cylinder or V8 is really all I need to know.
I assume nothing has been done to try to fix the problem?
When it's first started in the morning does it delay before going into gear or feel soft when first pulling away?
nothing done yet. my son said it has been driving fine and only hesitated the one time before i asked you, but the ck engine light is still on
The P0731 is a gear ratio error in first gear. Basically this means the trans had slipped while in first.
P0876 is for the underdrive clutch pressure switch. This code will set when the switch state is in the wrong position for a given gear. When the underdrive clutch is turned on there should be pressure, when the clutch is off there shouldn't be pressure.
What is most likely happening is a bad cooler filter in the trans is allowing fluid to drain back out of the torque converter and trans cooler while the truck is sitting. When it's restarted then it takes a bit for the trans to regain fluid prime. When the underdrive pressure switch doesn't close fast enough on startup it will set the P0876, and if the truck is put into gear before prime is gained again then it will set the P0731.
What I would recommend is changing both trans filters. The sump filter is directly on the bottom of the valve body and the cooler filter is the smaller spin on filter next to it. I'd recommend only Mopar parts for this, I've seen aftermarket filters cause this to happen. The sump filter's seal should be replaced along with the filter, which will need to be removed from the pump and then reinstalled with an appropriate sized socket. You'll need about 7-8 quarts of ATF+4 fluid to refill it. Disconnect the battery or use a code reader/scan tool to clear the codes, and the problem should be fixed.
That's the exact symptoms that I thought he would have had and what I had described. The trans is losing prime as it sits. The pan will need to be removed and replace both filters. Aftermarket fluid should be ok as long as you use ATF+4.