diff --git a/Marlin/src/module/stepper.cpp b/Marlin/src/module/stepper.cpp
index 8a5de4b6087b..6d451f8f0240 100644
--- a/Marlin/src/module/stepper.cpp
+++ b/Marlin/src/module/stepper.cpp
@@ -2261,7 +2261,6 @@ uint32_t Stepper::block_phase_isr() {
         interval = LA_isr_rate;
       }
       else if (step_events_completed < decelerate_after && LA_current_adv_steps < LA_max_adv_steps) {
-             //step_events_completed <= (uint32_t)accelerate_until) {
         LA_steps++;
         LA_current_adv_steps++;
         interval = LA_isr_rate;
@@ -2272,6 +2271,8 @@ uint32_t Stepper::block_phase_isr() {
     else
       interval = LA_ADV_NEVER;
 
+    if (!LA_steps) return interval; // Leave pins alone if there are no steps!
+
     DIR_WAIT_BEFORE();
 
     #if ENABLED(MIXING_EXTRUDER)
diff --git a/Marlin/src/module/temperature.cpp b/Marlin/src/module/temperature.cpp
index 9ecbb7c766fd..3b341369a9bc 100644
--- a/Marlin/src/module/temperature.cpp
+++ b/Marlin/src/module/temperature.cpp
@@ -1668,12 +1668,12 @@ void Temperature::updateTemperaturesFromRawValues() {
 #endif
 #define INIT_FAN_PIN(P) do{ _INIT_FAN_PIN(P); SET_FAST_PWM_FREQ(P); }while(0)
 #if EXTRUDER_AUTO_FAN_SPEED != 255
-  #define INIT_E_AUTO_FAN_PIN(P) do{ if (P == FAN1_PIN || P == FAN2_PIN) { SET_PWM(P); SET_FAST_PWM_FREQ(FAST_PWM_FAN_FREQUENCY); } else SET_OUTPUT(P); }while(0)
+  #define INIT_E_AUTO_FAN_PIN(P) do{ if (P == FAN1_PIN || P == FAN2_PIN) { SET_PWM(P); SET_FAST_PWM_FREQ(P); } else SET_OUTPUT(P); }while(0)
 #else
   #define INIT_E_AUTO_FAN_PIN(P) SET_OUTPUT(P)
 #endif
 #if CHAMBER_AUTO_FAN_SPEED != 255
-  #define INIT_CHAMBER_AUTO_FAN_PIN(P) do{ if (P == FAN1_PIN || P == FAN2_PIN) { SET_PWM(P); SET_FAST_PWM_FREQ(FAST_PWM_FAN_FREQUENCY); } else SET_OUTPUT(P); }while(0)
+  #define INIT_CHAMBER_AUTO_FAN_PIN(P) do{ if (P == FAN1_PIN || P == FAN2_PIN) { SET_PWM(P); SET_FAST_PWM_FREQ(P); } else SET_OUTPUT(P); }while(0)
 #else
   #define INIT_CHAMBER_AUTO_FAN_PIN(P) SET_OUTPUT(P)
 #endif