Chrysler 300C & SRT8 Forums banner
1 - 4 of 4 Posts

·
Registered
2008 Chrysler 300 SRT8
Joined
·
6 Posts
Discussion Starter · #1 · (Edited)
Hello guys. Basically I have problem since end of 2020. Almost year ago from intermittent u0101 code it went into limp mode permanently with u0101 and ESP BAS on EVIC (haven’t diagnose it then by myself cuz I don’t have scanner) got my car “fixed” by mechanic (car was standing for some time got battery drained, all of the connectors, according to one of guys there, were disconnected) then, they simply put It back together, and it worked, telling me some kind of loosen wires or dirt was the issue. Then I got my car back, drove it for few days, got ESP BAS again, restarted car worked well. Happened to me few more times (with the tranny stuck in gear that I was in while ESP BAS showed up) every time they were gone after restating car. I get it I’m IT guy. However after aprox 2 weeks u0101 went into constant forcing car into limp mode with 2nd gear only. I didn’t realize it can be COLD wether related. Then guys that first time got hands on 300 said we gotta swap tranny. So i went and get new(used) one and got it installed but it took us almost 6mths to get it back on road (due to other stuff not related to car itself). So it was summer, warm weather, car was running great, for 4-5 mths. In last 2 months I stared noticing ESP BAS again, but it was intermittent and happened really occasionally. But hey! Once I started thinking about it more I figured it out, it’s weather related. Week by week I’ve been noticing it more and more and now it’s permanent again. Few days ago when the weather dropped down to 2 degrees of Celsius I thought to myself it’s getting really cold, first time in this year, and 2-3 days later I’m stuck in constant no communication. Basically then and now was identical, but then I didn’t realize it was weather related. So now I tired to look more into temperature threads across the web and I found some archive topic with guy writing almost same story as mine, and after inspecting wiring and fuses on the day his car was working he took out TCM and put it into freezer/refrigerator. Bang, u0101 happened, and he just went and buy a used one finally solving problem. I got bookmark on this page so I can link it later.

Anyway, I’ve checked current, ground and can bus low/high, according to information in that thread, and they were all fine. Mine car doesn’t have one special wire between TCM and PCM (greenconnector) because simply I have PCM with 3 connectors only and 4th is blank bare metal. That got me thinking if the wiring is ok, fuses, diode and relay is fine (I haven’t check the relay itself but the power goes to fuse 37 so it has to be good?) TCM gone bad, and I have to try warm it up to reverse that guy experience. However one night at home with module didn’t work in my case and now I am confused if the weather is really the problem here. Any help would be appreciated I love the car and it’s my daily driver temporarily so I have to get it done ASAP. I’ll post photos of scanned different error codes found doing a quick scan using friends tool.

Sorry if something is not understandable, I’ve tried to describe it as clearly as I can but English isn’t my native.
Electronic instrument Audio equipment Bumper Gadget Automotive exterior

Electronic instrument Output device Audio equipment Gadget Automotive exterior

Gadget Bumper Automotive exterior Electronic instrument Audio equipment
 

·
Registered
2006 Chrysler 300c SRT8 w/ a Hellcat Supercharger
Joined
·
98 Posts
So you warmed the control module and tried to start the engine in the cold and it did not work right?
 

·
Registered
2008 Chrysler 300 SRT8
Joined
·
6 Posts
Discussion Starter · #3 ·
Yes I warmed TCM itself, but there was cold outside anyway. After clearing codes by disconnecting battery turned out codes were back after 1st key dance, at the beginning they were gone but after keeping ignition on for 6-7sec showed up ACC not available like it used to before with limp mode and after starting engine abs bas were back.
Nonetheless I have no way to warm up entire car right now. In addition to that, getting colder once didn’t get down car immediately. It was getting colder and colder for almost 2 mths now, and finally we got to the point were it’s constant
 

·
Registered
2008 Chrysler 300 SRT8
Joined
·
6 Posts
Discussion Starter · #4 · (Edited)
I bought used TCM and error is gone. ABS BAS no longer light up and key dance doesn’t print any codes, car shifts smoothly between park, reverse and drive but gets stuck in third gear after driving over 100yards. I found it to be controlled limp-in mode according to the instruction:

I’m not sure if I understand it correctly, reprogramming TCM will do the thing? Or it’s just from a car that gear ratio differs from mine and it will not work anyway? Is there any chance that tranny damage can occur while driving 3rd only with non programmed TCM?

Module was scrapped from 2008 Chrysler 300 CRD v6.
Correct me if I’m wrong 2.82 final drive ratio for CRD and 3.06 for v8/SRT
 
1 - 4 of 4 Posts
Top