diff --git a/Marlin/src/HAL/HAL_LPC1768/include/Wire.h b/Marlin/src/HAL/HAL_LPC1768/include/Wire.h
index 5c4b0b9518..b833d699e4 100644
--- a/Marlin/src/HAL/HAL_LPC1768/include/Wire.h
+++ b/Marlin/src/HAL/HAL_LPC1768/include/Wire.h
@@ -49,7 +49,7 @@ class TwoWire {
 
     uint8_t requestFrom(uint8_t, uint8_t);
     uint8_t requestFrom(int, int);
-    
+
     virtual size_t write(uint8_t);
     virtual size_t write(const uint8_t *, size_t);
     virtual int available(void);
diff --git a/Marlin/src/HAL/HAL_LPC1768/persistent_store_impl.cpp b/Marlin/src/HAL/HAL_LPC1768/persistent_store_impl.cpp
index f2f33ba9f1..ef8e1aa29f 100644
--- a/Marlin/src/HAL/HAL_LPC1768/persistent_store_impl.cpp
+++ b/Marlin/src/HAL/HAL_LPC1768/persistent_store_impl.cpp
@@ -107,7 +107,7 @@ bool write_data(int &pos, const uint8_t *value, uint16_t size, uint16_t *crc) {
    SERIAL_PROTOCOLPAIR(" write_data(", pos);         // This extra chit-chat goes away soon.  But it is helpful
    SERIAL_PROTOCOLPAIR(",", (int)value);            // right now to see errors that are happening in the
    SERIAL_PROTOCOLPAIR(",", (int)size);             // read_data() and write_data() functions
-   SERIAL_PROTOCOL("...)\n");
+   SERIAL_PROTOCOLLNPGM("...)");
    SERIAL_PROTOCOLLNPAIR(" f_lseek()=", (int)s);
    return s;
   }
@@ -117,7 +117,7 @@ bool write_data(int &pos, const uint8_t *value, uint16_t size, uint16_t *crc) {
    SERIAL_PROTOCOLPAIR(" write_data(", pos);         // This extra chit-chat goes away soon.  But it is helpful
    SERIAL_PROTOCOLPAIR(",", (int)value);            // right now to see errors that are happening in the
    SERIAL_PROTOCOLPAIR(",", size);             // read_data() and write_data() functions
-   SERIAL_PROTOCOLLN("...)");
+   SERIAL_PROTOCOLLNPGM("...)");
    SERIAL_PROTOCOLLNPAIR(" f_write()=", (int)s);
    SERIAL_PROTOCOLPAIR(" size=", size);
    SERIAL_PROTOCOLLNPAIR("\n bytes_written=", bytes_written);
@@ -136,7 +136,7 @@ bool read_data(int &pos, uint8_t* value, uint16_t size, uint16_t *crc, const boo
    SERIAL_PROTOCOLPAIR(" read_data(", pos);          // This extra chit-chat goes away soon.  But it is helpful
    SERIAL_PROTOCOLPAIR(",", (int)value);            // right now to see errors that are happening in the
    SERIAL_PROTOCOLPAIR(",", size);             // read_data() and write_data() functions
-   SERIAL_PROTOCOLLN("...)");
+   SERIAL_PROTOCOLLNPGM("...)");
    SERIAL_PROTOCOLLNPAIR(" f_lseek()=", (int)s);
    return true;
   }
@@ -153,7 +153,7 @@ bool read_data(int &pos, uint8_t* value, uint16_t size, uint16_t *crc, const boo
    SERIAL_PROTOCOLPAIR(" read_data(", pos);         // This extra chit-chat goes away soon.  But it is helpful
    SERIAL_PROTOCOLPAIR(",", (int)value);           // right now to see errors that are happening in the
    SERIAL_PROTOCOLPAIR(",", size);            // read_data() and write_data() functions
-   SERIAL_PROTOCOLLN("...)");
+   SERIAL_PROTOCOLLNPGM("...)");
    SERIAL_PROTOCOLLNPAIR(" f_write()=", (int)s);
    SERIAL_PROTOCOLPAIR(" size=", size);
    SERIAL_PROTOCOLLNPAIR("\n bytes_read=",  bytes_read);
diff --git a/Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp b/Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp
index b951962e6e..531dcadbfd 100644
--- a/Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp
+++ b/Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp
@@ -1095,7 +1095,7 @@
     SERIAL_PROTOCOLLNPAIR("UBL object count: ", (int)ubl_cnt);
 
     #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
-      SERIAL_PROTOCOL("planner.z_fade_height : ");
+      SERIAL_PROTOCOLPGM("planner.z_fade_height : ");
       SERIAL_PROTOCOL_F(planner.z_fade_height, 4);
       SERIAL_EOL();
     #endif
diff --git a/Marlin/src/feature/dac/stepper_dac.cpp b/Marlin/src/feature/dac/stepper_dac.cpp
index 33be396d2f..458eb61f1a 100644
--- a/Marlin/src/feature/dac/stepper_dac.cpp
+++ b/Marlin/src/feature/dac/stepper_dac.cpp
@@ -114,7 +114,7 @@ void dac_print_values() {
   SERIAL_ECHOPAIR(" (",   dac_amps(Z_AXIS));
   SERIAL_ECHOPAIR(") E:", dac_perc(E_AXIS));
   SERIAL_ECHOPAIR(" (",   dac_amps(E_AXIS));
-  SERIAL_ECHOLN(")");
+  SERIAL_ECHOLNPGM(")");
 }
 
 void dac_commit_eeprom() {
diff --git a/Marlin/src/gcode/config/M301.cpp b/Marlin/src/gcode/config/M301.cpp
index 4df4a2c0e5..9d876224fc 100644
--- a/Marlin/src/gcode/config/M301.cpp
+++ b/Marlin/src/gcode/config/M301.cpp
@@ -71,7 +71,7 @@ void GcodeSuite::M301() {
   }
   else {
     SERIAL_ERROR_START();
-    SERIAL_ERRORLN(MSG_INVALID_EXTRUDER);
+    SERIAL_ERRORLNPGM(MSG_INVALID_EXTRUDER);
   }
 }
 
diff --git a/Marlin/src/gcode/feature/caselight/M355.cpp b/Marlin/src/gcode/feature/caselight/M355.cpp
index 0e61ff5e0d..f22936d13c 100644
--- a/Marlin/src/gcode/feature/caselight/M355.cpp
+++ b/Marlin/src/gcode/feature/caselight/M355.cpp
@@ -56,10 +56,10 @@ void GcodeSuite::M355() {
     // always report case light status
     SERIAL_ECHO_START();
     if (!case_light_on) {
-      SERIAL_ECHOLN("Case light: off");
+      SERIAL_ECHOLNPGM("Case light: off");
     }
     else {
-      if (!USEABLE_HARDWARE_PWM(CASE_LIGHT_PIN)) SERIAL_ECHOLN("Case light: on");
+      if (!USEABLE_HARDWARE_PWM(CASE_LIGHT_PIN)) SERIAL_ECHOLNPGM("Case light: on");
       else SERIAL_ECHOLNPAIR("Case light: ", case_light_brightness);
     }
   #else
diff --git a/Marlin/src/gcode/feature/i2c/M260_M261.cpp b/Marlin/src/gcode/feature/i2c/M260_M261.cpp
index fdfa5804d6..918e764c40 100644
--- a/Marlin/src/gcode/feature/i2c/M260_M261.cpp
+++ b/Marlin/src/gcode/feature/i2c/M260_M261.cpp
@@ -73,7 +73,7 @@ void GcodeSuite::M261() {
   }
   else {
     SERIAL_ERROR_START();
-    SERIAL_ERRORLN("Bad i2c request");
+    SERIAL_ERRORLNPGM("Bad i2c request");
   }
 }
 
diff --git a/Marlin/src/module/configuration_store.cpp b/Marlin/src/module/configuration_store.cpp
index a27cf80563..6208275f51 100644
--- a/Marlin/src/module/configuration_store.cpp
+++ b/Marlin/src/module/configuration_store.cpp
@@ -1502,7 +1502,7 @@ void MarlinSettings::postprocess() {
         HAL::PersistentStore::access_finish();
 
         if (status)
-          SERIAL_PROTOCOL("?Unable to save mesh data.\n");
+          SERIAL_PROTOCOLPGM("?Unable to save mesh data.\n");
 
         // Write crc to MAT along with other data, or just tack on to the beginning or end
 
@@ -1540,7 +1540,7 @@ void MarlinSettings::postprocess() {
         HAL::PersistentStore::access_finish();
 
         if (status)
-          SERIAL_PROTOCOL("?Unable to load mesh data.\n");
+          SERIAL_PROTOCOLPGM("?Unable to load mesh data.\n");
 
         #if ENABLED(EEPROM_CHITCHAT)
           else
diff --git a/Marlin/src/module/temperature.cpp b/Marlin/src/module/temperature.cpp
index a80626764d..224fbcfced 100644
--- a/Marlin/src/module/temperature.cpp
+++ b/Marlin/src/module/temperature.cpp
@@ -266,11 +266,11 @@ uint8_t Temperature::soft_pwm_amount[HOTENDS],
     #endif
 
     if (!WITHIN(hotend, _BOT_HOTEND, _TOP_HOTEND)) {
-      SERIAL_ECHOLN(MSG_PID_BAD_EXTRUDER_NUM);
+      SERIAL_ECHOLNPGM(MSG_PID_BAD_EXTRUDER_NUM);
       return;
     }
 
-    SERIAL_ECHOLN(MSG_PID_AUTOTUNE_START);
+    SERIAL_ECHOLNPGM(MSG_PID_AUTOTUNE_START);
 
     disable_all_heaters(); // switch off all heaters.
 
diff --git a/Marlin/src/module/tool_change.cpp b/Marlin/src/module/tool_change.cpp
index 0d1e00c2cb..83cff7a641 100644
--- a/Marlin/src/module/tool_change.cpp
+++ b/Marlin/src/module/tool_change.cpp
@@ -123,7 +123,7 @@ inline void invalid_extruder_error(const uint8_t e) {
   SERIAL_CHAR('T');
   SERIAL_ECHO_F(e, DEC);
   SERIAL_CHAR(' ');
-  SERIAL_ECHOLN(MSG_INVALID_EXTRUDER);
+  SERIAL_ECHOLNPGM(MSG_INVALID_EXTRUDER);
 }
 
 /**
diff --git a/Marlin/src/sd/cardreader.cpp b/Marlin/src/sd/cardreader.cpp
index 0269ee15a4..b78ffead5b 100644
--- a/Marlin/src/sd/cardreader.cpp
+++ b/Marlin/src/sd/cardreader.cpp
@@ -364,7 +364,7 @@ void CardReader::openFile(char* name, const bool read, const bool subcall/*=fals
       if (file_subcall_ctr > SD_PROCEDURE_DEPTH - 1) {
         SERIAL_ERROR_START();
         SERIAL_ERRORPGM("trying to call sub-gcode files with too many levels. MAX level is:");
-        SERIAL_ERRORLN(SD_PROCEDURE_DEPTH);
+        SERIAL_ERRORLN((int)SD_PROCEDURE_DEPTH);
         kill(PSTR(MSG_KILLED));
         return;
       }