I have a 2007 Silverado LS, and a 2014 Silverado LT, both trucks had the "Service TPMS Sensor" lights lit. The service for the 2007 was going to cost upwards of 750.00 since it is out of warranty, the 2014 was fixed no charge. I learned of the KMEL50448 Kent Moore Tool EL50448 Tire Pressure Monitor Sensor through a friend and searched online, most were priced 85.00 plus shipping. My dealer service advisor said the most reasonable price for any automotive tools is Auto Tool World @ autotoolworld.com, he was correct, the price for this tool which is Excellent and very easy to use, was nearly 20.00 cheaper. Once you put your vehicle in learn mode, the KMEL50448 will tell you which sensor is bad by not responding, 35.00 for the new tire sensor and all is well. Having a vehicle with all these sensors and gizmos will bankrupt you in service costs, thank to places like Auto Tool World you can purchase the diagnostic equipment needed to help you maintain and fix your transportation. The staff of Auto Tool World are very helpful, responsive and knowledgeable. Thank you A.T.W. for putting me back in charge, you have a customer for life, I check you guys for all automotive items before anyone else.