diff --git a/src/chargercan.cpp b/src/chargercan.cpp
index bd15864..b79628a 100644
--- a/src/chargercan.cpp
+++ b/src/chargercan.cpp
@@ -99,4 +99,7 @@ void ChargerCAN::MapMessages(CanMap* can)
    can->AddSend(Param::udc, 0x109, 8, 16, 1);
    can->AddSend(Param::idc, 0x109, 24, 16, 1);
    can->AddSend(Param::opmode, 0x109, 40, 3, 5); //Set charging and connlock at once
+
+   /***** Auxiliary TX *****/
+   can->AddSend(Param::uaux, 0x110, 0, 8, 10); //12V aux battery: byte 0, gain=10 (0.1V resolution)
 }