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.
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.
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…
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.
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
I had a similar problem with a Savanna Van, turned out to be the connector having corrosion at the abs module,
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.
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.
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…
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…
Seems there would be a calibration for the sensor once installed and truck on flat ground..
Can you see the sensor parameter on the scan tool just curious…..and was it done on level ground?
Like Marvin said. Can you watch the SAS on scan data while slowly sweeping the wheel.
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…
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.
I have access to a gm scanner and I have driven and graphed them they never vary more than 1 mph from each other.
Check the steering rack itself. Make sure the bushings are good a tight. No movement.
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…