Traction Control Activating on Left Turns

Tville · November 3, 2019

Anyone having issues with the traction control cutting on and applying brakes? Truck is activating brakes & traction control system when turning left. Also, sporadically applying brakes and displays “hill start active” when not on hills. Dealer is waiting on GMs direction- speed sensors, wheel hubs, etc

Edited November 3, 2019 by Tville
Forgot to turn on reply’s

Bopper21 · November 6, 2019

Interesting enough I had this happen pulling out of a parking space (forward) turning left. It seemed very aggressive.

It was completely dry asphalt and about 82°F.

My 7 year old son said, "daddy, what was that!?"

Tville · November 9, 2019

Yep, mine did it a couple of times and I didn’t really think too much into it- then it got to where it was doing it every time- traction control continued to activate and pump the abs- dealer has had it for 3 weeks now and GM Engineering has had them pull speed sensors etc with no fix. GM is having them replace speed sensors- however, no parts are available. Needless to say, I am pretty disappointed. Deemed inoperable

sdelam · November 9, 2019

14 hours ago, Tville said:

Yep, mine did it a couple of times and I didn’t really think too much into it- then it got to where it was doing it every time- traction control continued to activate and pump the abs- dealer has had it for 3 weeks now and GM Engineering has had them pull speed sensors etc with no fix. GM is having them replace speed sensors- however, no parts are available. Needless to say, I am pretty disappointed. Deemed inoperable

That sucks, hopefully you got a good loaner

Tville · November 20, 2019

Over 1 month sitting in the service parking lot out of service. I am highly disappointed. No one is able to provide info as to when parts will be available.

Tville · November 23, 2019

Speed sensors replaced, no fix- ABS Traction Control activated as soon as the first turn. The dealer will be attempting to replace one of the front hub assembly’s
Anyone else who may be experiencing this should definitely report. Will update

jpgcrna · November 24, 2019

I have a 2020 denali that is having this issue but seems to be milder than some of yours. For me, on very tight left hand turns while going down a grade. For instance the local McD's does it to me every time here. Going around the parking lot there is a left turn going downhill. The ABS kicks in and the traction control light flashes. It feels like it is only happening in one wheel up front but I can't be sure. It does not cause me to stop. If I go slow enough or try to widen out the turn a little bit then I can keep it from happening. In my mind, this has to be a sensor calibration issue, my bet is they can fix it with an ecm flash. Since it doesn't happen often, and doesn't happen at all unless in that specific situation for me, I've decided to wait until there is a tsb to get it fixed, I don't really want any down time on the truck.

Tville · November 29, 2019

Update:

truck has been out of service for 6 weeks now- new speed sensor (no fix), new wheel hub (no fix), new calibration (no fix). Did something with the steer angle sensor and thought that may work after the tech test drove, did one final test drive yesterday before telling me to come pick it up and the truck began engaging traction control and ABS on left turns, so they have another request into TACS. The dealer has another brand new Denali Duramax on the lot that is doing the same thing. If anyone has any info, it would be greatly appreciated. $80k experiment truck, trying so hard to remain patient, it’s getting tough though.

MTU Alum · November 29, 2019

I calibrated these systems in the past. I would be really looking at longitudinal and lateral acceleration sensors. I believe these are contained in the air bag module (SDM). I would probably see if these signals could be zero'd or recalibrated. I would look at the mounting of the module and make sure it is sitting flush (seen issues before where welding flash on a stud made module not sit flush when torqued up). With you having a hill start issue (using long acceleration to determine grade) and issues with torque reduction in corner (looking at lateral acceleration sensor), I would start there.

#iworkforGM

Tville · November 29, 2019

I will pass this along to the tech- thank you. I know they mentioned Thursday that something was off 180 degrees at times, which they said was extreme

Tville · December 5, 2019

Just an FYI, wheel hub, speed sensors, re-cal all failed to fix the issue. Tech is working with GM Engineering (something regarding a steer angle sensor). Multiple Denalis on the lot are doing the same thing. If anyone has any info, would be greatly appreciated!

Duck749 · January 7, 2020

Newbie here, found this because my 2020 2500 with 150 miles on it started to do the same thing - second time out driving noticed it. Last night did the same thing on dry pavement when turning downhill with brake on to pull into my driveway. I am curious before I call the dealer if anyone has heard of or found a fix for this?

Tville · January 7, 2020

They are working on a fix from

my understanding- GM Engineering is coming out to evaluate. I will update once I have more info.
Is yours only with left turns?

Duck749 · January 7, 2020

Yes, it is currently with left turns when on the brake and going downhill, it is the custom model.

Tville · January 7, 2020

Ok, very similar to my issue- mine does it on left turns even when I am not applying the brakes, and has began to do it on flat turns as well. I will update after I meet with field engineer, they have been data logging and sending the info to GM Engineering. The dealership is able to duplicate it just pulling into their lot- they have tried a number of things- swapping parts, calibrations etc and they have not been able to fix it yet.