I have a 2009 JK and my ESP/BAS and Trac-Control dash lights illuminate.
I had 4 codes come up when I scoped it:
C1240 - ABS
C1219 - Steering Angle Sensor
C123F - Steering Angle Sensor
C123C - Dynamics Sensor
When I clear the codes they come back just as the tires roll. I'm not getting a mixed hodge-podge of different codes every time; they are the same four.
The speed sensors all look good (does not mean they aren't broken).

Recent Replacement / Maintenance Work Done:

This issue started immediately following the new clock-spring. I've done a lot of homework on this and can't get a straight answer. All of these things are connected somehow and I cannot put my finger on it. I also made the mistake of calling a Jeep Dealer here in Dallas and they wanted $180.00 just to look at it. That isn't happening... ever.


What would be the best course of action at this point? Speed Sensors?

 

Is your ABS light on at all? Or just the CEL

If you can find a buddy with a reader that can read ABS codes that would tell you if and which one of your speed sensors is out. The CEL system doesn't tell you which one, just says there is something wrong.

The majority of readers and flashpaqs, tablets, etc... cannot read ABS codes so it has to be one of the fancier ones.

Unless the speed sensor wire is physically cut, you cannot tell if it is broken by looking at it.

 

ABS Light is not on. I'm going to start calling around to a few of the Jeep Shops to see if they can give me a reading. This has been a never ending goose chase of dead sensors over the last year.

 

Innova has a line of code readers that can do abs codes. Maybe around $150. I have one and it works well.

 

I will look into that. My calibrator does the bare minimum... and I spent like $200 on it; should have shopped it harder.

 

I have a Harbor Freight reader that also reads ABS and TCS codes, on sale with a 20% off coupon found almost anywhere it was about 100 bucks. So far its worked well for me.

 

I also have this one and it's worked great.