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Drivetrain - 2011+ Discuss front and rear axle, transfer case, brakes, etc. Transmission questions belong in the appropriate transmission forum below. Fifth generation and above...

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Old 04-03-2019, 05:04 PM   #21 (permalink)
BK2012
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2012 LTZ. 6.6L Duramax. Service Traction control and Stabilitrak messages. Thought maybe all mud/snow recently messing with a sensor. Power washed everything. Not seeing anything loose visually. Ideas? YouTube is all over the place on this....steering wheel sensors, grounding, mass air flow, .....etc.

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Old 04-16-2019, 06:06 PM   #22 (permalink)
Johnm
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I'm having similar messages pop up too. Right after I replaced the entire braking system on my truck. I'm quite ... "angry" ... at GM about this. I shouldn't have to replace pads, rotors, calipers (all 4 sliders bolts seized) and all of the parking brake parts (except the cables) on a 2013 with 80k miles.

Back to current problem ... I now get Service Trailer Brake System, Stabilitrak, Traction Control and the ABS light pops up. I finished replacing the brakes yesterday and the notices popped up after the initial test drive yesterday but did not this morning, but then did again on the way home from work this afternoon.

1 - What do I look for on the Speed Sensors?
2 - How do I know which wheel is the "culprit"? Is there a "simple" home mechanic's way to test them?
3 - We're supposed to got camping this coming weekend. Is it safe to tow a ~6k lbs travel trailer like this? I do realize the truck is very capable of the weight and all just don't know if the trailer brakes will be working or not and other potential problems.

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Old 04-16-2019, 06:10 PM   #23 (permalink)
BK2012
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Let me know what you find out. I'm still fighting mine.
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Old 04-16-2019, 07:23 PM   #24 (permalink)
heymccall
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A bad ABS sensor will cause all of the aforementioned warnings.

Each sensor is tested at startup. Start your truck, and leave it in park. Do the ABS lamp and other warning appear? If so, unplug each sensor (front behind shock tower, rear at frame rail), and using a multimeter, measure resistance of each sensor. They should all tear around 1,000 ohm. Whichever one doesn't is the culprit.

If the ABS light and other warnings don't illuminate until 12 mph or so, then a signal from a sensor is suspect. This can be from a loose (worn out) front wheel bearing assembly, or, a damaged/ contaminated rear sensor.
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Old 04-16-2019, 07:34 PM   #25 (permalink)
Ron Nielson
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Start by going to a big name parts store (autozone, etc) and ask them to scan your truck's computers, including the ABS module. The big named places have enough money that they buy scanners that will read most all of the computers, not so with the cheap $40-$50 scanners that many of us have. When you get the codes, please report back.

You live in NY and they salt the roads heavily in the winter. I'm betting you don't wash the salt off your undercarriage every time you drive your truck i the winter, so you have LOTS of corrosion and rust. One thing that can happen is that the corrosion or rust under the ABS sensor wire where it attaches to the wheel hub and it pushes the sensor too far away from the reluctor/sensor ring for it to read the speed correctly.

Go to Yutube.com and search for 'south main auto abs sensors' and you will get a great education on ABS Sensors. SMA is located a little south of you just off I-390 Avoca, NY.
\Fix the problem to make the ABS light go out and the others will likely disappear at the same time.
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Old 04-17-2019, 09:31 AM   #26 (permalink)
Johnm
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Alright, I think I have a idea of the problem. I'll stop at a parts store to verify which wheel 1st.

When I was reinstalled the driver's rear hub I noticed the toothed "gear" had a section of grease/dirt on in ... not horrible but maybe not good? I didn't think much of it since I've seen them like this before but when the wheel sensors where exposed to the elements. I think (hope) I just need to remove the rotor and use some brake cleaner on the teeth to clean it up.

Does this sound like it could be the cause?

thanks,
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