The automatic belt tensioner pulley is in the process of going out. The pulley itself is slowly suffering from a high pitched whining noise which is caused by bearing failure. With the current mileage the part in question shouldn't by any means be failing, the tensioner works fine but the pulley wobbles a bit too much. If the pulley continues to wobble more and finally results in catastrophic failure it can shred the serpentine belt which will render the vehicle useless or even become a danger to any and all occupants in the vehicle especially if it fails on the highway. If the belt goes out it can bend other pulleys or shear off pulleys, bolts, or even bend the harmonic balancer (engine vibration dampener) which would result in a blown or seized up engine. I'll also add that the belt could cause a fire if it gets wedge between other spinning pulleys at the time of the pulley's bearings overheating and the pulley either breaking off or causing the belt to shred.

- Merrillville, IN, USA

At 36000 miles the engine burns oil. So far as of 46000 miles pistons burned have been replaced pvc filter and valve were replaced along with valve cover. At present 54000 miles engine still burns oil.

- Denton, TX, USA

Check engine light is displayed and the motor is hesitating. This issue is a second occurrence due to the valve cover leaking and causing the spark plugs to go bad. First time the vehicle was under warranty at approximately 29000 miles and now the vehicle has 39000 miles and the issue has recurred. This appears to be a continually recurring problem for 2011 Chevrolet Silverado trucks.

- Springfield, VA, USA