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Service brakes soon/service stabilitrak

2018 Views 9 Replies 3 Participants Last post by  pohoda, 
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Having an issue chasing down why I’m unable to turn on traction control and stabilitrak. Use to come on every now and then but now it’s showing both off and not allowing me to turn on from the steering wheel. Checked ground under intake, wheel speed sensors and I just can’t seem to pin point what the issue is. Have two codes that popped up hoping someone can chime in and give me some kind of idea what the issue might be. Any help would be really appreciated

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Have you had the interior apart recently? Or about the time you started noticing this issue?

The g-sensor on your dash gets its input from a gyroscope (Multi-axis Acceleration Sensor Module). The ECU or BCM (not sure which communicates with the module) has lost communication with this module. I do not know where it is located, but they are usually installed on the interior of the car.
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SofaKingSlow said:
Have you had the interior apart recently? Or about the time you started noticing this issue?

The g-sensor on your dash gets its input from a gyroscope (Multi-axis Acceleration Sensor Module). The ECU or BCM (not sure which communicates with the module) has lost communication with this module. I do not know where it is located, but they are usually installed on the interior of the car.
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Just back seat really to install fuel system but nothing up front that I know of
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Bump…. No one in here has had “service stabilitrak” and figured out what the issue was?
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I have, but my issue was a tone ring on a wheel bearing, different DTC. Yours is a different issue.

The sensor is located under the passenger seat, on the floorpan.
Relevant pages from FSM attached:
Font Paper Paper product Document Symmetry
Font Parallel Pattern Drawing Plan
Font Paper Paper product Document Publication
Font Material property Book Publication Paper

Best of luck. Hopefully, it is just a loose connection.
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SofaKingSlow said:
I have, but my issue was a tone ring on a wheel bearing, different DTC. Yours is a different issue.

The sensor is located under the passenger seat, on the floorpan.
Relevant pages from FSM attached:
View attachment 159712 View attachment 159713 View attachment 159714 View attachment 159715
Best of luck. Hopefully, it is just a loose connection.
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Thanks for the help and reference pages 👍🏼

SofaKingSlow said:
I have, but my issue was a tone ring on a wheel bearing, different DTC. Yours is a different issue.

The sensor is located under the passenger seat, on the floorpan.
Relevant pages from FSM attached:
View attachment 159712 View attachment 159713 View attachment 159714 View attachment 159715
Best of luck. Hopefully, it is just a loose connection.
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Will i have to get the Yaw sensor calibrated at dealership if I put in a new one?
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Logang717 said:
Will i have to get the Yaw sensor calibrated at dealership if I put in a new one?
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I doubt it, but I can check the manual over the weekend.
To be honest, these modules, as a whole, rarely fail. I would bet you have a small wiring issue.
I had once pinched a wire so that the insulation was compromised and was shorting to ground. Fixed with a piece of electrical tape.
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SofaKingSlow said:
I doubt it, but I can check the manual over the weekend.
To be honest, these modules, as a whole, rarely fail. I would bet you have a small wiring issue.
I had once pinched a wire so that the insulation was compromised and was shorting to ground. Fixed with a piece of electrical tape.
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Cadillac mechanic seems to think it’s a wire or possible faulty EBCM. Will run through wires and see if anything’s pinched or broken then go from there I guess 🤷🏻‍♂️….
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Update… fixed about 5 wires that were frayed by ebcm and replaced ebcm and still no luck.. any other ideas? BCM? Any other grounds besides one under intake and grounds behind cylinder heads?
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I know this is an older thread, but had many of the same symptoms. Service stabilitrak, service power steering, service brakes soon, lost power steering. My mechanic has the SnapOn diagnostics and was able to pin it down to the EBCM being faulty which was caused by the ABS module shorting out due to brake fluid seeping into the electronics. Apparently this is a known issue across several GM vehicles that share the same ABS module P/N# 20875884 and they have since come out with an updated ABS module to prevent the brake fluid from entering into the ABS module electronics. Luckily my mechanic took his time tracing down all the wires and modules because he said that had he just replaced the EBCM it would have failed in short order since the ABS module had lots of fluid in it and was shorting. On the old ABS module he cut into the rubber seal and a bunch of fluid seeped out. Since the module is sealed the only entry point is from the inside which attaches to the ABS manifold itself. Once I get it back my mechanic is going to provide all the details, but you imagine all the codes being thrown with a shorting ABS module and EBCM that is on its way out. It was pretty much all of them. Attaching a pic here to show how much fluid came out of the ABS module.

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