Hey guys, went on a quick out of the blue offroad trip 2 hours away from home (4hr round trip) driving to was all good cruising down the hwy 65-70mph no issues. Offroaded for around a hour and half no issues until i get back on the hwy back home. Jeep threw a check engine, and didnt want to switch into OverDrive. I drove it down the Hwy for about 20ish minutes i felt the trans getting hot so i pulled off turned the jeep off for about 2mins and started driving again. I decided to not go on the Hwy and took the streets for a little and noticed it went into overdrive so i hopped back on the Hwy and was fine all the way back. When i got home i checked the codes and got 4 amazing! P0300,P0303,P0304,P0700. So 2 are for misfire and ones for trans control system. Any idea where to start on Diag? Are all these codes somehow related? Any tips would be great seems like i cant have this jeep running mint for long before i get engine codes about every 2 weeks-1month. Some info on my jeep, G2 d44 front axle with elocker, 8.25 rear, lift is about 5-6in, 35s with bead locks, stock engine with a cowl intake.

Any questions please ask and ill try to answer asap!

 

Well...

Whats the condition and level on your transmission fluid?

Your trans computer is mounted under the center console, is your console mount broken? Whats the condition of the harness plug? Corrosion?

 

I had the P0700 code a couple months ago and i replaced the tcm thats under the steering colum with a junkyard one i grabbed and it was all good. Ill check the fluid level again but it was to they full mark last time i checked.

 

Im starting to think i should just 5.3 swap it and call it good. Getting tired of these problems with this stock ****

 

Start with the misfires. The transmission code is likely a side effect of the engine running rough.

Check your crankshaft position sensor. When they get hot and fail, they cause random misfires and make the transmission act up. It's the most common link between those two problems.

After that, check your ignition system plugs, wires, and coil for cylinders 3 and 4. The off-roading could have shaken something loose.