Stabilitrak/Traction Control Issues

07 Tahoe LT, 90k

I know there's alot of posts about this issue but I'm not seeing anything about my specific issue.

I had the engine cover off to change the purge valve for vapor canister. Lost one of the rubber grommets so ordered a new one and left the cover in the back. Week later new grommet arrives so put the cover back on and changed oil. Somehow... when putting the cover back on I accidentally unplugged one of the coil packs..

Without realizing what I did, started truck and moved from my driveway into a spot. Realized stabilitrak/traction control message and engine light, also running shaky. Shut it down found the plug off, plugged it back in. Disconnected battery for 15min started up, ran fine but traction control/stabilitrak came on again but no engine light.

Before I plugged coil pack back in I put my cheap scanner on and had PO175/172 left/right banks etc.

Thought maybe I threw something off with coil pack so ordered one. Put on with no change. Also change the oil again because gas may be in oil From what I read on the cord.

Still no change. Wound up doing MAF Sensor also.

Is it possible I screwed up the fuel injector for the cylinder that was unplugged? Keep in mind truck ran with coil pack unplugged for less than a minute.

Another possibility with the codes it had was O2 sensors.

Best part is,, during my half hour ride to work there are no issues, no stabilitrak popping up, no bang on the 1-2 shift, nothing..

During the ride home it comes on every 5min. I've been keeping my scanner plugged in to turn off as soon as it pops up.

I read there's some kind of reboot that can only be done at a dealer but don't want to spend that money until I get some solid feedback on it.

TIA

I don't believe running it with an unplugged injector for a bit hurt anything.

for the coil, if you unplugged it from the harness side it shouldn't hurt it. but I have heard of a coil going bad after running with a plug wire off it. spark has to find a place to go and I guess it can jump over something to ground, leave some carbon tracking and keep jumping there instead of the plug when hooked back up.

rare thou.

If you're still having Stabilitrak errors, best to get a decent scanner and see what is causing the error.
I had a flaky steering angle sensor throw an inconsistent Stabilitrak error.
Code was still stored even when there was no error on the DIC.
Sensor finally went out for good and I had a constant Stabilitrak error as soon as I turned the steering wheel.

There are a lot of parts involved in the Stabilitrak system so grab the code and see what it says.
Could be any number of sensors for the system.

Was it the spark plug wire? If so, they like to get an air gap inside if they’re not pulled off at the boot vs the wire.

If it’s time for a new set of wires, change em now to try and get two pterodactylus with one stone.

As @Grady_Wilson stated above, I recommend that you purchase a quality bi-directional scanner. That will allow you to troubleshoot much more deeply, and will probably result in you finding the root cause of your issue. Then, going forward, you will pay for this scanner ($350-$600) many times over, as you successfully troubleshoot future issues. My scanner paid for itself in less than 1 year.

RightSideUp said:

07 Tahoe LT, 90k

I know there's alot of posts about this issue but I'm not seeing anything about my specific issue.

I had the engine cover off to change the purge valve for vapor canister. Lost one of the rubber grommets so ordered a new one and left the cover in the back. Week later new grommet arrives so put the cover back on and changed oil. Somehow... when putting the cover back on I accidentally unplugged one of the coil packs..

Without realizing what I did, started truck and moved from my driveway into a spot. Realized stabilitrak/traction control message and engine light, also running shaky. Shut it down found the plug off, plugged it back in. Disconnected battery for 15min started up, ran fine but traction control/stabilitrak came on again but no engine light.

Before I plugged coil pack back in I put my cheap scanner on and had PO175/172 left/right banks etc.

Thought maybe I threw something off with coil pack so ordered one. Put on with no change. Also change the oil again because gas may be in oil From what I read on the cord.

Still no change. Wound up doing MAF Sensor also.

Is it possible I screwed up the fuel injector for the cylinder that was unplugged? Keep in mind truck ran with coil pack unplugged for less than a minute.

Another possibility with the codes it had was O2 sensors.

Best part is,, during my half hour ride to work there are no issues, no stabilitrak popping up, no bang on the 1-2 shift, nothing..

During the ride home it comes on every 5min. I've been keeping my scanner plugged in to turn off as soon as it pops up.

I read there's some kind of reboot that can only be done at a dealer but don't want to spend that money until I get some solid feedback on it.

TIA

Click to expand...

there's no "reboot", that's a rabbit hole of someone's imagination either that or the wrong terminology is being used
since you are at 90k already and you have 02 sensor codes I would go ahead and replace both upstream 02 sensors (02 sensors are rated for 100k)
then double check your work under the hood, it's kinda hard to disconnect a coil from simply removing and replacing the engine cover, but more easily done when the purge valve was done but however that occurred I would make sure nothing else happened.
then clear the codes and drive it.......

Any updates on what you found?
Bad yaw sensor, bad steering angle sensor?

Grady_Wilson said:

If you're still having Stabilitrak errors, best to get a decent scanner and see what is causing the error.
I had a flaky steering angle sensor throw an inconsistent Stabilitrak error.
Code was still stored even when there was no error on the DIC.
Sensor finally went out for good and I had a constant Stabilitrak error as soon as I turned the steering wheel.

There are a lot of parts involved in the Stabilitrak system so grab the code and see what it says.
Could be any number of sensors for the system.

Click to expand...

Hi , I am having same problem, as soon as I turn wheel stab. Light comes on and no cruise control. My buddy replaced steering sensor at his shop and honestly I don’t think he could figure out from there. No codes are coming up. I just changed o2 upstream today bank 1. Separate issue I believe.
He thinks it’s the brake control module although no codes found.
Any ideas. ? Thanks in advance
Jon

Since you instantly get the error as soon as the wheel is turned I would still look at the steering angle sensor.
Did you use a GM sensor?
Plenty of stuff I read online said only OEM sensors work correctly.
Saw plenty of posts about needing to go in again if you use an aftermarket sensor.
A good two way scanner will allow you to read the live data from the steering angle sensor to see if it is actually reporting data.
Also, if the wheel was turned, even slightly, during the install a Steering Angle Sensor reset would be needed.

Gotta get a local auto part store to pull your codes.

A bad wheel speed sensor will also have those symptoms. If that’s the case the entire hub assembly is replaced because you’re in there.