Symptoms:

I bought this truck six months ago and the last couple of weeks, I noticed something is not right with my steering. What is happening is while you are driving on any speed, the steering wheel will suddenly over steer as if my gearbox is loose. This would cause the truck to wander all around and when that happens, it is very scary. One garage looked at my steering gearbox and the front alignment but they could not find anything. The tires are new and rotated twice already since I owned it. I am afraid this truck is unsafe and I need your help right away!

Tire Problem Advisor:

Beginning 1998 upwards, Chevy Suburban trucks are equipped with Electronic Variable Orifice (EVO) power steering system which controls oil pressures in your power steering pump for better road handling and stability. This is done using 2 control modules fed by 2 sensors mounted in your power steering pump and steering column. Most problems relating to this system usually originates on the sensor located at the steering column.

To verify if this is the cause of the problem, try unplugging the 3 wire terminals of that sensor. If I remember it right, the colors are light blue, grey and orange black (or ask your Chevy dealer for the right colors). If the symptom stops, replace that sensor under the steering column.

Notes:

When in doubt, bring your vehicle to authorized Chevy dealer shop for a second opinion.

Above repair is only a recommendation and you do this at your own risk. Always have your vehicle align after replacing the tires to prevent repetition of the tire problem.