Is it related???

[DirtDigler]

So after trying everything, I finally had to go to a muffler shop and have them weld a nut to my tranny drain plug that stripped out horribly. Everything has been fine but immediately after leaving there, check engine light came on and had rough idle. The stereo cut out for 2 seconds but came back on. When I pulled in driveway i could smell something burnt, possibly the ATF, plus the engine sounded pretty rough ( sorry but hard to explain, just wanted to shut it off asap). I replaced the ATF and everything looked good inside the pan. Is it a coincidence that PO300 popped up after all that heat on the trans pan or is it possible that some wiring may have corrupted the ECM? Last time I had that code no one could figure it out and ultimately had to have dealer flash it to fix it. Thoughts?

 

[DirtDigler]

I'm worried the heat may have caused problems with the wiring inside the trans pan. Didnt see anything though and it's already back together. I cleared the dtc but it comes back immediately after starting.

 

[swathdiver]

Time to put a Tech-2 on it for proper diagnostics. I have no idea but my thinking is to always start where someone last was.

 

[Doubeleive]

unlikely that anything in the transmission would cause a random misfire
I would check your battery cables and grounds if anything
might be time for a tune up if that hasn't been done

 

[Mudsport96]

Could be just coincidence...

But i HATE welding stuff on a vehicle. No matter how careful you are , you always run the risk of making something unhappy. Did they at minimum disconnect the battery before welding?

 

[DirtDigler]

I forgot to tell him to disconnect the battery. He just went right at it.