A few months ago I bought a 2011 GMC Savana 3500 (1 ton). When I bought the van, all 4 tires were at 55psi. A few days ago I had 4 new tires installed. The tire shop inflated the tires using the tire pressure guide on the door of the van which stated 55psi for the front tires and 80psi for the rear tires. The tire pressure warning light has been on ever since the new tires were installed and the van's display is telling me both front tires are low. I checked the pressure and it is 55psi in both front tires and 80psi in both rear tires. Any ideas how to make the light go away or tell the van the tire pressures are correct? Thank you in advance.