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Discussion Starter #1
Yesterday my son was on I95 on cruise control in his '12 3.8 w/112k miles (car is vg cond) and he says the cruise control and traction control kicked off simultaneously without any input on his part.. When he restarted the car, everything worked normally again. I'm puzzled on this one. Sensor?
 

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maybe one of the abs/speed sensors?

front ones are built into the hubs, so hubs would need to be replaces, if it is what is causing it.

rears, just unbolt the sensors from the hub carrier.
 

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Also check the brake light switch, if the plunger doesn't get pushed it when you are off the brakes, it will keep the brake lights on continuously and shut down the ESC/TC and Cruise Control. Our brake light switches are adjustable, 2 nuts that hold it on the brake pedal.
 

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I had this exact problem it was a speed sensor. It started intermittently, and eventually threw a CEL. I had this happen twice in the first 10k miles or so...
 

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Discussion Starter #5
So this is what we have established so far. The day before we replaced both headlights and taillights with Spec-D's. Both sets of lights have load resistors to prevent hyper flashing. We have confirmed that when the headlights come on it disables the cruise control and the traction control. When we turn the headlights off, they both work normally again. What is causing the interference is the mystery.
 

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So this is what we have established so far. The day before we replaced both headlights and taillights with Spec-D's. Both sets of lights have load resistors to prevent hyper flashing. We have confirmed that when the headlights come on it disables the cruise control and the traction control. When we turn the headlights off, they both work normally again. What is causing the interference is the mystery.
How did you determine this? did swap headlights and swapped them again for testing?
If so, did you swap the tail lights and headlights separately during testing?

did it do it again for a second time?

Sounds like a coincidence to me... or a combination of what degreek said and the tail lights.
 

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Discussion Starter #7 (Edited)
How did you determine this? did swap headlights and swapped them again for testing?
If so, did you swap the tail lights and headlights separately during testing?

did it do it again for a second time?

Sounds like a coincidence to me... or a combination of what degreek said and the tail lights.
What we found out that it is actually the Spec D sequential LED tail lights (these pull more power than the average LED tail lights which we replaced and did not even have load resistors before), not the headlights; even though the Spec D sequential tail lights came with load resistors. After doing some research this what we found out that the cruise control uses the same ground path to the rear tail lights as the cruise control. Because of the complexity of these sequential LED's, when the tail lights come on (even without the brake lights; just the tail lights) it is sending a signal through the ground wire to the CC causing it to disengage. What we are going to try next is adding one more set of load resistors to see if this remedies the problem. I will be posting updates as we work through this issue. I was surprised not to find any other Gen Coupe owners with these lights having this issue. However we did find other vehicles with new after market rear LED's having the same issue.

https://www.gardenweb.com/discussions/2262954/led-taillights-and-cruise-control-inop
https://forum.ih8mud.com/threads/2-fix-for-led-tail-lights-causing-cruiser-control-issues.195975/
 

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What we found out that it is actually the Spec D sequential LED tail lights (these pull more power than the average LED tail lights which we replaced and did not even have load resistors before), not the headlights; even though the Spec D sequential tail lights came with load resistors. After doing some research this what we found out that the cruise control uses the same ground path to the rear tail lights as the cruise control. Because of the complexity of these sequential LED's, when the tail lights come on (even without the brake lights; just the tail lights) it is sending a signal through the ground wire to the CC causing it to disengage. What we are going to try next is adding one more set of load resistors to see if this remedies the problem. I will be posting updates as we work through this issue. I was surprised not to find any other Gen Coupe owners with these lights having this issue. However we did find other vehicles with new after market rear LED's having the same issue.

https://www.gardenweb.com/discussions/2262954/led-taillights-and-cruise-control-inop
https://forum.ih8mud.com/threads/2-fix-for-led-tail-lights-causing-cruiser-control-issues.195975/
it could be that when CC is engaged and sees that the brake light is on (not because of the brake pedal) then it disengages the CC. This could by load resistances ohms.

I suggest using a multimeter and testing the ohms of each OEM taillight from the plug, then checking ohms with spec d taillights as is, then you can figure our around what ohm resistors is needed.
 

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Discussion Starter #9
We haven't tried using a multi meter yet, but we were also getting uneven brightness on the tail lights. The right was brighter than the left. We solved that problem by increasing the STOP fuse by 5 amps. We added load resistors to the rear (which now totaled two resistors per side) and that did not resolve the CC problem. We are now going to try to disconnect the negative battery cable to see if that helps.
 

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2012 Gen. 3.8 Track w/ZF
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I had the exact same problem back when I had about 25,000 miles on my car. I know this sounds strange but each time. I got the cruise and TC working again by pulling and then pushing back in, the Audio and Memory fuses which are linked together in the fuse box in the cabin at the left end of the dash. It may have done it a couple more times. I don't recall, but it has never done it since. I now have a bit over 106,000 miles.
 
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