diff --git a/Core/Src/main.c b/Core/Src/main.c
index ce4504c..4f48e00 100644
--- a/Core/Src/main.c
+++ b/Core/Src/main.c
@@ -209,15 +209,16 @@ int main(void) {
 
     /* USER CODE BEGIN 3 */
     update_status_leds();
-    afe_measure();
-    tmp144_read_temps();
-    if (HAL_GetTick() - main_loop_start > ERROR_CHECK_START) {
-      check_error_conditions();
-    }
     fan_ctrl_update();
     clock_sync_update();
-    // Only start sending CAN frames once the clock is synchronized
+    // Only use communication interfaces (BQ UART, TMP144 UARTs, CAN) once the
+    // clock is synchronized
     if (clock_sync_state == CLOCK_SYNC_NORMAL_OPERATION) {
+      afe_measure();
+      tmp144_read_temps();
+      if (HAL_GetTick() - main_loop_start > ERROR_CHECK_START) {
+        check_error_conditions();
+      }
       ams_can_send_heartbeat();
     }
     delay_period();