MY 6.4 hemi W/545 Trans, goes into limp mode at fwy speed

I need to figure out why my truck goes into limp mode at fwy speed.

engine or transmission limp mode?

Engine is high hide only
Trans is one gear only (usually)

code po443 poo38 poo58. any of these make engine go into limp mode, engines goes from 2100 rpm to idle, gas pedal does nothing, pull to side of the road cycle engine. gas pedal works. but does it again once i hit freeway speed in less than 5 min.

Do you have one of those oil catch cans in the pcv hose? If so, look for an air leak in a hose, clamp or fitting. Had this issue on my srt8 challenger. It's scary when it happens on the freeway. Another Thing to check would be the carbon canister purge line from the intake, make sure there are no leaks there either. Can you post the freeze frame data?

Wow, this happened last week on my SRT-6.4, message in dash said something about throttle "something" and gas pedal did nothing and engine went to idle. After a few seconds it was ok, scary feeling. Definitely want to hear what you find.

P0038-O2-SENSOR 1/2 HEATER CIRCUIT HIGH
P0058-O2-SENSOR 2/2 HEATER CIRCUIT HIGH
P0443-EVAP PURGE SOLENOID CIRCUIT

This is the one thing that really sucks about drive by wire. The computer is "seeing" a different amount of air (via the sensors) than what it expects for a given amount of throttle opening, so it says FU and goes into limp mode. I think the only way to figure this out is with the freeze frame data. Even the cheaper scan tools will give you freeze frame data now. Physically, I would look for vacuum leaks and chaffed wiring for the post cat O2 sensors (if you have them). I can get you the wiring and flowcharts if you want.

chart attached is for the p0038 code

Maybe mines the oil filler cap, just changed oil that day. I know you're talking to the other guy but I think you helped me on mine, I check it tomorrow.

Dead pedal limp mode.

yes dead pedal limp mode. it has only two o2 sensors and no cat converters..

What engine management system do you have? HotWire?

If whoever supplied the harness and tune disabled the secondary o2 sensors, then you need to go after the evap code first. Again, the code could be a result of a wiring issue or a vacuum leak.

Do you have a carbon canister and a purge solenoid or was that removed from the harness too?

they tell me, not and easy fix. still working on it.......

A vacum leak will not cause any of these codes as these are all electrical codes. First thing I do when I have a few codes that are electrical related is look at the wire diaghram and see if any of the circuits are related and tied in to each other anywhere including grounds. Ron