15 Jeep Wrangler C121C. A verified repair using a flash update?
I do mobile programming and am amazed at some of the requests I get. (that can be a different discussion) I get a call from a shop that is a pretty regular customer with relatively good results. If you do mobile programming you know what I mean.
I get a call to program an ABS module on a 15 Jeep wrangler. New unit from dealer. I usually do not ask why, and I also did not this time. I get to said shop, and initialize the ABS module. All goes well until I am returning from the drive required. I get a traction control light. Check ABS codes. I have a C121C Torque request denied. The diagnosis is very basic. It comes down to either a new ABS module or a New PCM.
I see that there are updates for PCM and TCM. These are additional charges, and there is not a bulletin stating what this will repair. It is a roll of the dice for sure. After some discussion with the shop. The decision is made to go ahead and do the updates. There is also an oil control code. I do not remember for sure what it was. The shop was going to investigate after I was done.
After a 10 mile test drive it is decided both codes have been repaired by a PCM/TCM update. I am not sure which fixed it. They were both way out of date,
I just fine it interesting, AllData, Identifix both had the code description and diagnosis as module replacement. Tech authority did not even list the code that I could find. No suggestion for an update. Makes me wonder if it needed a ABS module at all. I am going with NO. I will never know for sure.
Hope this helps someone in the future.
Sam