Electrical nightmare Sierra 1500 2018 after 45k miles stabilitrak check engine

[Lsfansierra]

So my truck is plagged with the stabilitrak light since a year. Which at first was intermittent then permanent after couple months.

 

After 8 months or so of it(after the 3 years warranty nothing electrical is covered), the car was coding for a binch of things like the steering, the brake fluid level (which was fine) and all abs sensor, abs pump. All those sensor were tested and everything was fine. So it was definitely an electrical gremlin.i check the g218 ground and the 2018 do not have this problem. Dont lose your time checking it; gm did make a cut in the isolator from factory.

 

Friend tried to erase codes and It would not go away. Couldn't use cruise control with stabilitrak light on.

 

Then a mengine code with p0090 p0091 appeared and engine power reduced with it. I wish at that point the truck burned out. Couldn't erase the code with his Snap on scanner.

 

Went to a electrical specialist and he inspected the 3-4 area where the harness under those trucks are weak. All good. He changed the brake fluid sensor 15$. He inspected the PCM connections all good. 

The codes went away, which was a pure random fact. I changed front brakes and put back winter tires in stock sizes  right after.

 

Then the codes all reappears.  

 

Back to the garage and the code disappeared. Everytime the codes/ lights disappeared was with dry weather. Rain/ snow would trigger both. A big nightmare at that point

Already. Reminding you its a 3yo truck with very low mileage, treated with anti rust, no towing, a little bit of off road here n there, 99% om the pavement.

 

The specialist called his garagist friend in Alberta be cause everyone has a pickup there. He told to check a spot in front, engine compartiment, inner fender corner rubs against a harness; the harness was half cut at the rubbing point. This was causing  the stabilitrak intermittent problem. He redid the wiring in the harness.

 

Then the check engine codes (fuel regulator code); under the truck, he started to unwrap the harnesses one by one and manages to test wires one by one in there. He finds a dried out wire and shake it; wire snaps! Its a green wire. It was the one causing the check engine.

 

Front left bearing is done. 

 

So whats my verdict? This truck harnesses suck and they're not well made enough to last in a winter country like Canada. It's sad. I bet all trucks have their problems.

 

Definitely the inner fender problem is a big flaw from GM. Be sure to check this out. I won't be keeping this truck in the long run, which was my plan at first when bought new.