So I'm cruising along the highway and all of a sudden the vdc kicks in and I get 5-6 quick pulses from the brakes, and no wasn't doing anything crazy straight smooth road going about 60. Next thing I know I look at the gauges and everything is dead except for the gas and odometer and the slip and vdc lights are on. So I pull over and get my code reader out of the trunk hook it up and PASS no codes wth??? I fired it back up and same deal no tach, temp or speedo, so I plug the code reader back in and erase the codes to reset the ecu, fire it up again and bam everything's back to normal. So I did a quick inspection of the brakes, brake fluid, tires etc and everything looks normal. The only odd thing was I heard the fan kick on and it sounded a little different but I could just be paranoid, but once I erased the codes I didn't hear it come back on so now I'm stumped.

We've gotten quite a bit of rain lately but today was dry, I'm thinking maybe some water got up in the vehicle speed sensor but I'm not sure of the likelihood of that without getting a vss code. So I get back to work and let it sit for 4-5 hours then on the ride home I have no issues, so I rechecked for codes and still nothing, check the IM monitors and as expected everything is not ready so I know the ecu is still relearning or whatever. I did some searching and didn't find any similar issues so I'm stumped, any ideas on what could cause random vdc engagement????

I'm leaning towards having a vss issue that I'll check out but after an hour pouring over the fsm there's nothing on replacing the sensors just a bunch of troubleshooting crap with the consult. I know they're up on the diff somewhere but not sure where so any help would be great.
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Sedan or coupe. Stock or aftermarket wheels, and tire sizes.

 

Should we look at the obvious? Tire sizes are?

 

Coupe, wheels are 19x9.5 +25 and 19x10.5 +22 tire sizes are 245/35/19 & 275/35/19 same setup I had last summer and never had any issues like this before. I did notice today I've got some squeaky noise coming from the rear left not constant but I randomly hear it kind of sounds like a bird chirping.

 

So I had a look at the vss and didn't see anything unusual but I think I may have found the squeak the ground strap from the sub frame to the chaise was wedged in between the bolt and lip of the sub frame causing some fraying so I pulled it out a bit. I'm gonna go for a ride and see how it sounds but I did forget to add I haven't had a repeat of the issue at all since yesterday so maybe it was just a fluke, we shall see. Still kind of nervous tho so any incite would be great.

 

Difference in circumference is 3.2 percent. Exactly as it should be for proper VDC operation.

 

So I had the car looked at by my mech today and found my alignment was all effed up and way out of spec, (.7 toe in the rear and .4 up front) got it realigned and it feels much better so hopefully that was the issue