Gm stabilitrack

David Educator North Carolina Posted   Latest   Edited  
Resolved
Braking
Programming
2013 Chevrolet Silverado 1500 LS 5.3L (0 LMG) 6-spd (6L80)

2013 chevrolet silverado has no codes 

Has had ebcm updates at gm dealer new hub bearing, steering wheel sensor,yaw rate sensor all replaced. 

Still has unwanted activation of stabilitrack during sharp turns over 20 mph and over 30 degrees turn either direction 

The brake will apply the left front brake in a rh turn momentarily enough that it can pull the wheel from your hand. And will do the same the direction also. stabilitrack lights come on and off when happens. 

Wheel speeds are within 1 mph of each other when this happens. 

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William Technician
West Virginia
William
 

Any modifications?

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David Educator
North Carolina
David
 

No new modifications. Truck does have a small lift but it's been on the truck since new. Customer stated that the issue seems to have started after ebcm programing was updated.

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Phil Technician
Massachusetts
Phil
 

Was the EBCM reprogrammed to try to correct this issue, or was it done for some other reason? I know you state it is only a “small lift”, but perhaps the new EBCM software is less tolerant of the lift that is installed now. How hard is it to return to stock? That is the way I would be leaning now. Return to stock, perform an alignment and any needed calibrations, then road test and see if the…

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David Educator
North Carolina
David
 

The truck was sold new with the lift that's on it by an upfiter. The ebcm was updated last year sometime as an recall or bulletin by local dealer. When it was in for service.

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Jason Manager
Michigan
Jason
 

verify part number on steering angle sensor. believe gm has a PIP on it. the sensors are different for certain model years. throws a light on turns. I will try to find tmro. get a vin up. last 8

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Shahzad Owner/Technician
British Columbia
Shahzad
 

I had a similar problem with a Savanna Van, turned out to be the connector having corrosion at the abs module,

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Juan Technician
California
Juan
 

Have had several other GM cars with similar problems. It's always been a break on the ABS harness to the hub bearing. Pull back the harness shielding & tug on the wires & see if one breaks. Usually at a flexing point.

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David Educator
North Carolina
David
 

Both hub assembly and sensors are new.

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Mark Engineer
Colorado
Mark
 

David I read what you wrote about wheel speeds being within 1 MPH. I had a similar issue on a suburban and the solution was so simple I overlooked it. One of the tires was a different size. I sure hope it can be this simple for you. Sadly it will probably be much more difficult.

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David Educator
North Carolina
David
 

Almost new tires all the same size.

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William Owner/Technician
Kentucky
William
 

We recently had a similar vehicle that had a stabilitrac warning light due to a defective steering angle sensor, After replacing the sensor the brakes would apply on turns, we eventually replaced the sensor again which fixed the vehicle, The sensor showed no unusual glitches when driving, If you have another vehicle handy look to see if the sensor direction could be reversed from one sensor to…

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Caleb Diagnostician
Indiana
Caleb
   

I'd have to a agree with a SAS fault. I believe that is the old style SAS with the hardwired digital and analog phases. The sensor is built for one signal that works close to 0 and left and right a little. The other signals pickup on one direction right or left respectively the further you turn. Could be an issue with phase transition if that makes sense. If you read the description an operation…

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Marvin Mechanic
Mississippi
Marvin
 

Seems there would be a calibration for the sensor once installed and truck on flat ground..

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David Educator
North Carolina
David
 

I did the yaw rate relearn with a tech2

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Marvin Mechanic
Mississippi
Marvin
 

Can you see the sensor parameter on the scan tool just curious…..and was it done on level ground?

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Caleb Diagnostician
Indiana
Caleb
 

Like Marvin said. Can you watch the SAS on scan data while slowly sweeping the wheel.

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Robert Diagnostician
Florida
Robert
 

Try graphing the resistance of the front sensors on the frame side of the harness while flicking the harness in areas where the harness flexes with suspension movement and the connector itself. Flicking the harness with your fingers will usually expose broken wires inside of insulation and connector issues. The resistance is very high of the sensor itself like 150Kohms or higher that's why you…

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Eric Owner/Technician
Michigan
Eric
 

Will your scan tool graph the wheel speeds like a GM oe scanner? Easy enough to watch for any drop outs and ID which one is the culprit. This easily rules them out or condemns them.

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Agree
David Educator
North Carolina
David
 

I have access to a gm scanner and I have driven and graphed them they never vary more than 1 mph from each other.

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Dwight Owner/Technician
California
Dwight
 

Check the steering rack itself. Make sure the bushings are good a tight. No movement.

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Eric Owner/Technician
Wisconsin
Eric
 

David, You state the vehicle “Has had ebcm updates at gm dealer new hub bearing, steering wheel sensor,yaw rate sensor all replaced. Still has unwanted activation of stabilitrack during sharp turns over 20 mph and over 30 degrees turn either direction”. Does this mean the problem existed before and the work was done to fix the problem? Have you graphed the Yaw Rate Sensor, VSES Active, TCS…

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David Educator
North Carolina
David Resolution
 

The truck ended up having a sway bar that was to weak and was causing the extra body roll replaced it with an upgraded swaybar and links now drives like it had for years past.

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