Is my use of the L9637 iso9141 single-wire transceiver a robust design?
Thanks to Kartman, I added a voltage divider on the ESP32 input from the L9637.  On the transceiver RX I added a 47k to Gnd and a 470k to the ESP32. Seems to work. Getting good response now.  I've tested it several times, and it is responding appropriately now.