mjsitek

Purchased the Range model RA003R AFM / DFM device for my 2021 Silverado with the 5.3L V8 and 8-speed transmission. The device did effectively deactivate the start / stop function, however, DFM was still active when driving under 40 MPH. I put a rough country exhaust system on the truck, and you can audibly hear the drone when it drops cylinders. You can also feel the added hesitation when it switches between DFM and full V8 mode. I sent it back to Range and they exchanged the module for a new one. After plugging in the replacement module, it works only every other time I start the vehicle. Called customer service again and they have no explanation, except in rare occasions it just won't work on your vehicle. They did offer to sell me the new $500 Pulsar module instead (at full price, of course). Not happy with this purchase, or the support from Range. Wondering if anyone else has had a similar experience? I will never purchase another product from this company.