2015 Sierra wanders after leveling kit

[sobe_zuki]

I'm curious if anyone else has encountered this feeling. After I put on my 2.5" RC level, the truck doesn't feel very stable on the freeway, especially with a slight cross wind. I feel like it's fighting my steering inputs with the electric power steering which makes me wander all over the lane. I've read there's a zeroing procedure for the wheel angle sensor which I don't think Firestone (who did my alignment) did. This 2015 just doesn't feel as stable at high speeds as did my 2013 with the traditional hydraulic power steering. It's supposed to compensate for road crown, etc.

 

Electric Power Steering System

 

The belt-driven electric power steering system features an integrated electromechanical power steering unit, containing the power steering control module, its sensors, the power steering motor, a belt drive and a ball nut mechanism.

 

The power steering control module is part of the power steering assist motor assembly and is replaceable as a complete unit independent of the steering gear assembly. The torque sensor is integrated with the steering gear pinion and is serviced as part of the steering gear.

 

The power steering control module has a software feature referred to as Smooth Road Shake Compensation that reduces steering wheel vibration caused by an imbalance from the front tire/wheel assemblies. The vibration transmitted to the steering wheel is referred to as Smooth Road Shake and is a phenomenon that occurs only at highway speeds and on smooth roads. The power steering control module employs active controls to sense and reduce the periodic torque component applied to the steering wheel caused by the wheel imbalance force. This software feature will compensate for a specific range of imbalance.

 

In addition to smooth road shake, road crown is compensated for by the steering wheel angle sensor signal, which calculates the intended driving direction. The Electronic Brake Control Module (EBCM) receives serial data message inputs from the steering wheel angle sensor.

 

The steering wheel angle sensor does not require centering often. However, if the steering wheel angle sensor is not correctly centered it may create a lead/pull condition. If this condition is encountered, always perform the Steering Angle Sensor Centering procedure in SI before performing a wheel alignment.

[sobe_zuki]

Steering Calibrations – Electronic Power Steering (EPS) steering position and torque sensors that are not calibrated correctly may cause a lead or pull condition. Some vehicles with EPS may require relearn of the steering wheel position sensor and software end stops after any type of alignment work is completed and before the vehicle is driven. Check the appropriate Service Information to determine if the vehicle being serviced requires the relearn procedure. Failure to relearn the steering wheel position sensor, if needed, may actually cause the vehicle to pull.

[newdude]

Did you have the front end re-aligned? If you have not yet, that may be the cause of your issue.

[sobe_zuki]

Did you have the front end re-aligned? If you have not yet, that may be the cause of your issue.

Yes I did, right after the install. Firestone did the alignment. The steering wheel is slightly off-center also which could be contributing to the issue since there's a sensor in the wheel.

[tootall87]

Yes I did, right after the install. Firestone did the alignment. The steering wheel is slightly off-center also which could be contributing to the issue since there's a sensor in the wheel.

There's your issue. Take it back.

[Big_D]

There's your issue. Take it back

 

Yes, your alignment is off.

 

Just go to GM and save yourself the hassle.

[Front Runner]

As others have said, your alignment is off. I would start with that.....

[iCryWheniGoPoop]

Yup, Firestone Effed it up.

 

 

Sent from Off Driller Side

[sobe_zuki]

Thanks guys.