Stabilitrack problem, won't go away. 2018 Sierra 1500 5.3

[Lsfansierra]

Hi, I have the stabilitrack off ON in the dash. No more cruise control. On the scan I get:

-no/low voltage abs pump fault but it starts with the scanner manually

-the speed sensor picks up a reading on live scanning. So they should be fine.

-no related fuse seems broken

-wheel angle sensor is triggered after sometime the stabilitrack has been on

-low brake fluid, which I topped off 5 days ago (brake pads are at 25% life) 

Codes; c0263, u0077, u0126, u0151.

 

The real first time the stabilitrack lighted was when I went thru a mud/ water puddle. It went away, then came back and then back and forth when raining or randomly. Now it's always on.

 

It kinda fit with with the timing I installed bigger tires, 275/70 17 instead of 265/70/17 and never got the speedo calibrated. 

 

There was the ethanol sensor harness hanging at some point, but I don't think it has anything to do with it. The truck has no ethanol sensor and it's a dead end harness.

 

We are now going deeper in this.

 

I've Read about solutions that might work;

-brake pedal sensor (maybe for the previous generation?)

-brake fluid sensor

-grounds; alternator / on the frame rail/ cowl/ 

 

Truck see gravel roads, deep snow, rain storm, Canadian winter, mud. Nothing extreme, but medium truck use.

 

Anyone has an easy answer!?

[Lsfansierra]

Ok after a year of stabilitrak BS and no cruise control, things got worse; engine fell into limp mode. Car would barely move. Car is POS and unusable.

 

Went to a electric specialist and he inspected the truck for the knows GMC weak spot; the 2 wire harness under the driver side and the one near the rear end. All good. He changed the fluid sensor. He inspected the PCM connections and all good.

 

I get my truck back and no stabilitrak code. 2 days later, it's back.

 

I install new front brakes and install stock size winter tires. My summer tires were bigger than stock; 285/70/17. I have a leveling kit front too. 

 

After 150miles, the stabilitrak disappear on the highway. Then comes back on. I decides to inspect the G218 ground trouble after internet search. Beware that 2018 trucks were fix; gm had a cut made where the foam insulator was getting stuck between ground.

 

Then 1 day after, it's gone after a day of work completely.

 

So, after all, it's just a matter of get your speedo calibrated. Yep, get your damn Speedo calibrated!!