Service stab sys - tire problem?

[Aridgerunner]

Back in the summer I cut the left rear tire and was able to replace just that one tire. The sales person said I could end up with a problem because of the different tire diameters. But because the other tires had more than 50% of tread left I gambled.

Did I just lose the gamble?

 

[4speedfunk]

I think it would take a larger differential in tire size to throw a Stabilitrac light. Even if the difference in tire size was enough to activate Stabilitrac, it would not throw a light. It would simply cause nuisance activations.

Because you have a light, it means you have a failure somewhere. There are many things that can cause this but, most of the time it’s a wheel speed sensor. Scan the codes and it will point you in the right direction.

 

[scoreh3]

Not if it’s the same size tire it would be like putting the spare on if you had a flat.

 

[Aridgerunner]

OK. I'll start searching. And I'll post the answer when I find it. Thanks again.

 

[Aridgerunner]

I'm going nuts! My own research just confused me so I took the H3 to a different well know shop in the area. They quickly told me the problem was the steering angle sensor. They replaced it for me about a week ago and all was well. Until today. The warning is back on. I called the shop and the guy told me that the part is covered under warranty and they will get a replacement.

Somehow I think the sensor is not the problem. What else.could it be?

 

[Bigunit]

This has happened to me several times. Try replacing the brake light pedal switch. Cheap and easy to replace.

Check this out on Amazon
GM Genuine Parts D1596H Brake Light Switch https://www.amazon.com/dp/B000NW4RA...t_i_D6CDMPMH2P1CJWSDGTCA?_encoding=UTF8&psc=1

Sent from my moto z4 using Tapatalk

 

[Jeepwalker]

Do you have access to a decent OBDII scanner? Or someone you know?

It would be helpful if you did. A guy could look at the scanner and view the brake switch action (on/off) each time ya press the pedal. Press a bunch of times ....a hundred times if ya need to, and see if the switch doesn't 'make' at any of the activation cycles? There's a very good chance it IS the brake switch ...and often they will flake out intermittently at first, then get progressively worse. It would be good to know before you just start throwing parts at it. Could be the wiring to a wheel sensor (or the sensor itself). There again, a scan tool would allow you to view each of the sensor's status as you drive. Although it might be difficult to pick up an intermittent.

If you don't have access to a scanner, and don't want to bother, then the switch isn't much, it's easy to replace and might resolve the problem. They do fail and your H3 probably has over 100k miles. One thought: you might consider letting the shop replace the SA sensor first then drive it a week or so before replacing the brake switch. If the fault doesn't return you know it was the SA sensor. If the fault returns .... and then you replace the brake switch (and the fault doesn't return thereafter), then you know it was likely the switch. Just a thought. But do what you think is best.

Good luck. Let us know what the solutions was

 

[Aridgerunner]

This is where my insanity comes from. I took it to a reputable shop who surely has a scanner. They told me the SA sensor was bad and replaced it. A week later the Serv Stab System lights is back on. I have an appointment with them for next Thursday, the 17th. In the meantime I can replace the switch if I can get it here before then.

Next question. How does the brake light switch have anything to do with the steering angle sensor? And for info, the H3 has 125,500 miles on it.

Thanks again.

 

[Jeepwalker]

The stability system looks at a number of factors, like steering angle, vehicle speed, engine speed, braking, acceleration/deceleration (and what rate), gas pedal position, wheel speed sensors, probably a tilt-meter, and probably a few others I'm forgetting...

The brake switch is engaged a lot ...so it's a wear item. Obviously steering angle is also used a lot. They probably plugged in their scanner, saw a SA code, looked at a few other possibilities (hopefully the br switch ..but you never know) and replaced the sensor.

Intermittent issues can be very difficult to uncover ...esp in one shop visit. They can take a lot of time too. Sometimes ya find an issue right away, and that's great. Sometimes not. Some owners spend weeks trying various things to nail down an intermittent electrical problem. There could be several possibilities from failed sensors, corroded connectors, rodent-chewed wire you can't see ..intermittent sensors, who knows? Since most owners don't want to pay a shop $2000-$2800 to spend 1-3 days shop-time digging into 'every' possibility, ya start with the low-hanging fruit and hopefully that gets it. If not, ya move on to the next possibility starting with the most common failures and least expensive parts. I mean, what else can ya do?

Hopefully the next couple moves on your docket will be the answer.