Tl* the contact owns a 2006 chevrolet silverado 3500. the contact stated that while driving at various speeds and towing a trailer, the limp mode warning lamp illuminated as the vehicle decelerated. the vehicle was taken to the dealer where the technician was unable to diagnose the failure. the manufacturer was made aware of the failure. the vehicle was not repaired. the failure mileage was 99,950 and the current mileage was 205,000.