diff --git a/system/hardware/hardwared.py b/system/hardware/hardwared.py
index b2d3e69fad..fb339b5f8b 100755
--- a/system/hardware/hardwared.py
+++ b/system/hardware/hardwared.py
@@ -12,7 +12,7 @@
 import psutil
 
 import cereal.messaging as messaging
-from cereal import log
+from cereal import car, log
 from cereal.services import SERVICE_LIST
 from openpilot.common.dict_helpers import strip_deprecated_keys
 from openpilot.common.filter_simple import FirstOrderFilter
@@ -177,6 +177,32 @@ def update_restart_condition(current_time, restart_triggered_ts, params, onroad_
       restart_triggered_ts = current_time
   return restart_triggered_ts
 
+
+class _CarParamsCache:
+  def __init__(self, refresh_s: float = 5.0):
+    self._refresh_s = refresh_s
+    self._last_check = 0.0
+    self._last_bytes: bytes | None = None
+    self.is_tesla = False
+
+  def update(self, params: Params) -> None:
+    now = time.monotonic()
+    if (now - self._last_check) < self._refresh_s:
+      return
+    self._last_check = now
+
+    cp_bytes = params.get("CarParams")
+    if not cp_bytes or cp_bytes == self._last_bytes:
+      return
+    self._last_bytes = cp_bytes
+
+    try:
+      CP = messaging.log_from_bytes(cp_bytes, car.CarParams)
+      self.is_tesla = (CP.brand == "tesla")
+    except Exception:
+      self.is_tesla = False
+
+
 def hardware_thread(end_event, hw_queue) -> None:
   pm = messaging.PubMaster(['deviceState'])
   sm = messaging.SubMaster(["peripheralState", "gpsLocationExternal", "selfdriveState", "pandaStates"], poll="pandaStates")
@@ -210,8 +236,10 @@ def hardware_thread(end_event, hw_queue) -> None:
   should_start_prev = False
   in_car = False
   engaged_prev = False
+  pwrsave = False
 
   params = Params()
+  cp_cache = _CarParamsCache()
   power_monitor = PowerMonitoring()
 
   HARDWARE.initialize_hardware()
@@ -350,7 +378,6 @@ def hardware_thread(end_event, hw_queue) -> None:
     if should_start != should_start_prev or (count == 0):
       params.put_bool("IsEngaged", False)
       engaged_prev = False
-      HARDWARE.set_power_save(not should_start)
 
     if sm.updated['selfdriveState']:
       engaged = sm['selfdriveState'].enabled
@@ -364,6 +391,17 @@ def hardware_thread(end_event, hw_queue) -> None:
       except Exception:
         pass
 
+    # Tesla vehicles keep CAN bus powered when parked, so don't put the device to sleep
+    cp_cache.update(params)
+    tesla_no_sleep = cp_cache.is_tesla
+
+    # Power save decision: independent of should_start
+    # For Tesla: never power save (CAN stays alive when parked)
+    should_pwrsave = (not tesla_no_sleep) and (not onroad_conditions["ignition"] and msg.deviceState.screenBrightnessPercent < 1e-3)
+    if should_pwrsave != pwrsave or (count == 0):
+      HARDWARE.set_power_save(should_pwrsave)
+    pwrsave = should_pwrsave
+
     if should_start:
       off_ts = None
       if started_ts is None:
@@ -384,6 +422,11 @@ def hardware_thread(end_event, hw_queue) -> None:
       if off_ts is None:
         off_ts = time.monotonic()
 
+    # On Tesla, keep started_ts valid even when parked so the manager
+    # does NOT kill selfdrive/controls processes (CAN stays alive).
+    if tesla_no_sleep and started_ts is None and started_seen:
+      started_ts = time.monotonic()
+
     # Offroad power monitoring
     voltage = None if peripheralState.pandaType == log.PandaState.PandaType.unknown else peripheralState.voltage
     power_monitor.calculate(voltage, onroad_conditions["ignition"])
@@ -397,8 +440,8 @@ def hardware_thread(end_event, hw_queue) -> None:
     statlog.sample("som_power_draw", som_power_draw)
     msg.deviceState.somPowerDrawW = som_power_draw
 
-    # Check if we need to shut down
-    if power_monitor.should_shutdown(onroad_conditions["ignition"], in_car, off_ts, started_seen):
+    # Check if we need to shut down (Tesla keeps CAN powered, so never auto-shutdown)
+    if (not tesla_no_sleep) and power_monitor.should_shutdown(onroad_conditions["ignition"], in_car, off_ts, started_seen):
       cloudlog.warning(f"shutting device down, offroad since {off_ts}")
       params.put_bool("DoShutdown", True)