Range Technology has a start stop module that plugs into the OBD port. Their website doesn’t list the ‘19 Blazer, but I called and spoke to them and they guarantee it to work, saying the 3.6 engine is still the same, so I ordered it and installed it today, works perfect, just like they said. Range Technology has it listed for $199, and has a pop up discount for 10% off plus free shipping, but Auto Anything is an authorized dealer/supplier and have it listed at $144 with free ship or $5.95 overnight fed ex. Hope this helps, didn’t want the Trifecta download to the ECU, and was waiting for Steve at smartstopstart.com, but he didn’t have a timeframe for completion.