Steering Wheel Oscillation Conditions

Some 2020 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD models may have a steering wheel oscillation, vibration or shake condition at speeds of 50–80 mph (80–129 km/h). (Fig. 33) It may be possible high road force, out of balance tire and wheel assemblies, or a steering gear calibration that is not optimized that may be causing the steering wheel oscillation condition.

 

Fig. 33

 

To correct this condition, first road test the vehicle with the PicoScope from the CH-51450 Oscilloscope Diagnostic Kit to determine the source of the vibration. (Fig. 34)

 

Fig. 34

 

Mount the PicoScope vibration sensor to the driver’s seat track and perform a road test at 50–80 mph (80–129 km/h) on a smooth road. Drive the vehicle a minimum of 10 minutes to warm up the tires prior to measuring seat track vibration.

 

Road Force Balance Correction

If the T1 Y-axis is consistently more than 25 mg, service all wheel and tire assemblies following the latest version of Bulletin #10-03-10-001. When mounting the wheels to the tire and wheel balancer equipment, make sure the assembly is held tightly centered in order to get a correct measurement. Use the proper adapters to maintain a centered assembly. (Fig. 35)

 

Fig. 35

 

TIP: Before measuring tires on GM-approved tire force variation measurement equipment, the vehicle must be driven a minimum of 15 miles (24 km) to ensure removal of any flat-spotting.

Road force balance the assemblies. It is recommended to get the road force values to less than 30 lbs. on the front tires and less than 45 lbs. on the rear tires.

 

Update Calibration

If the T1 Y-axis is consistently under 25 mg and steering wheel oscillation is persistent (after correcting the wheel and tire assembly, if needed), update the K43 Power Steering Control Module with the latest steering gear calibration. Record the SPS Warranty Claim Code on the job card for warranty transaction submission.

TIP: The steering wheel must be centered and all lead/pull conditions must be corrected prior to updating the Power Steering Control Module.

After reprogramming, perform a Learned Value Reset using GDS 2 to clear out all adaptive data from the Power Steering Control Module.

Perform a road test again at 50–80 mph (80–129 km/h) on a smooth road to confirm the steering wheel oscillation has been reduced.

For additional information, refer to Bulletin #19-NA-240.

 

– Thanks to Kevin Minor

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