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Jeep 2009 Grand Cherokee Laredo Questions & Answers
Humming noise over 40
Sounds like the ring and pinion gear were not checked for proper mesh after the driveline was replaced. The drive shaft can load the bearings in the differential, this can cause the mesh to change. The ring and pinion need to be checked and reshimed.
Tpms warning light stays on even though all tires have correct pressure
It's probably a Tire Pressure Monitoring System sensor inside one of the tires. These sensors are a component of the valve stem and are prone to break down due to road salt and other corrosion. I had the same thing happen, ignored it, and eventually got a blow out on the highway doing 70 mph. Not fun. Have all 4 replaced at once for about $150.
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