diff --git a/radio/src/pulses/pxx2.cpp b/radio/src/pulses/pxx2.cpp
index 7b28efd26..54bd9a06f 100644
--- a/radio/src/pulses/pxx2.cpp
+++ b/radio/src/pulses/pxx2.cpp
@@ -26,9 +26,12 @@ uint8_t Pxx2Pulses::addFlag0(uint8_t module)
   uint8_t flag0 = g_model.header.modelId[module] & 0x3F;
   if (g_model.moduleData[module].failsafeMode != FAILSAFE_NOT_SET && g_model.moduleData[module].failsafeMode != FAILSAFE_RECEIVER) {
     if (moduleSettings[module].counter == 0) {
-      flag0 |= PXX2_FLAG0_FAILSAFE;
+      flag0 |= PXX2_CHANNELS_FLAG0_FAILSAFE;
     }
   }
+  if (moduleSettings[module].mode == MODULE_MODE_RANGECHECK) {
+    flag0 |= PXX2_CHANNELS_FLAG0_RANGECHECK;
+  }
   Pxx2Transport::addByte(flag0);
   return flag0;
 }
@@ -95,11 +98,11 @@ void Pxx2Pulses::setupChannelsFrame(uint8_t module)
 
   // Channels
   uint8_t channelsCount = sentModuleChannels(module);
-  addChannels(module, flag0 & PXX2_FLAG0_FAILSAFE, g_model.moduleData[module].channelsStart);
+  addChannels(module, flag0 & PXX2_CHANNELS_FLAG0_FAILSAFE, g_model.moduleData[module].channelsStart);
   if (channelsCount > 8) {
-    addChannels(module, flag0 & PXX2_FLAG0_FAILSAFE, g_model.moduleData[module].channelsStart + 8);
+    addChannels(module, flag0 & PXX2_CHANNELS_FLAG0_FAILSAFE, g_model.moduleData[module].channelsStart + 8);
     if (channelsCount > 16) {
-      addChannels(module, flag0 & PXX2_FLAG0_FAILSAFE, g_model.moduleData[module].channelsStart + 16);
+      addChannels(module, flag0 & PXX2_CHANNELS_FLAG0_FAILSAFE, g_model.moduleData[module].channelsStart + 16);
     }
   }
 }
diff --git a/radio/src/pulses/pxx2.h b/radio/src/pulses/pxx2.h
index 3c882e162..fe095e631 100644
--- a/radio/src/pulses/pxx2.h
+++ b/radio/src/pulses/pxx2.h
@@ -40,7 +40,8 @@
 
 #define PXX2_TYPE_C_OTA             0xFE
 
-#define PXX2_FLAG0_FAILSAFE         (1 << 6)
+#define PXX2_CHANNELS_FLAG0_FAILSAFE         (1 << 6)
+#define PXX2_CHANNELS_FLAG0_RANGECHECK       (1 << 7)
 
 #define PXX2_RECV_OPTION_MASK_FASTPWM       0x10
 #define PXX2_RECV_OPTION_MASK_TELEMETRY     0x00 // Todo : update when defined