diff --git a/selfdrive/test/process_replay/process_replay.py b/selfdrive/test/process_replay/process_replay.py
index c75e9aa0a8..50585ab3ae 100755
--- a/selfdrive/test/process_replay/process_replay.py
+++ b/selfdrive/test/process_replay/process_replay.py
@@ -17,12 +17,12 @@ import cereal.messaging as messaging
 from cereal import car
 from cereal.services import SERVICE_LIST
 from msgq.visionipc import VisionIpcServer, get_endpoint_name as vipc_get_endpoint_name
+from opendbc.car.can_definitions import CanData
 from opendbc.car.car_helpers import get_car, interfaces
 from openpilot.common.params import Params
 from openpilot.common.prefix import OpenpilotPrefix
 from openpilot.common.timeout import Timeout
 from openpilot.common.realtime import DT_CTRL
-from openpilot.selfdrive.car.card import can_comm_callbacks
 from openpilot.system.manager.process_config import managed_processes
 from openpilot.selfdrive.test.process_replay.vision_meta import meta_from_camera_state, available_streams
 from openpilot.selfdrive.test.process_replay.migration import migrate_all
@@ -36,20 +36,6 @@ PROC_REPLAY_DIR = os.path.dirname(os.path.abspath(__file__))
 FAKEDATA = os.path.join(PROC_REPLAY_DIR, "fakedata/")
 
 
-class DummySocket:
-  def __init__(self):
-    self.data: list[bytes] = []
-
-  def receive(self, non_blocking: bool = False) -> bytes | None:
-    if non_blocking:
-      return None
-
-    return self.data.pop()
-
-  def send(self, data: bytes):
-    self.data.append(data)
-
-
 class LauncherWithCapture:
   def __init__(self, capture: ProcessOutputCapture, launcher: Callable):
     self.capture = capture
@@ -356,25 +342,21 @@ def get_car_params_callback(rc, pm, msgs, fingerprint):
     CarInterface = interfaces[fingerprint]
     CP = CarInterface.get_non_essential_params(fingerprint)
   else:
-    can = DummySocket()
-    sendcan = DummySocket()
-
-    canmsgs = list(islice((m for m in msgs if m.which() == "can"), 300))
+    can_msgs = ([CanData(can.address, can.dat, can.src) for can in m.can] for m in msgs if m.which() == "can")
     cached_params_raw = params.get("CarParamsCache")
-    assert len(canmsgs) != 0, "CAN messages are required for fingerprinting"
+    assert next(can_msgs, None), "CAN messages are required for fingerprinting"
     assert os.environ.get("SKIP_FW_QUERY", False) or cached_params_raw is not None, \
             "CarParamsCache is required for fingerprinting. Make sure to keep carParams msgs in the logs."
 
-    for m in canmsgs:
-      can.send(m.as_builder().to_bytes())
-    can_callbacks = can_comm_callbacks(can, sendcan)
+    def can_recv(wait_for_one: bool = False) -> list[list[CanData]]:
+      return [next(can_msgs, [])]
 
     cached_params = None
     if cached_params_raw is not None:
       with car.CarParams.from_bytes(cached_params_raw) as _cached_params:
         cached_params = _cached_params
 
-    CP = get_car(*can_callbacks, lambda obd: None, params.get_bool("AlphaLongitudinalEnabled"), False, cached_params=cached_params).CP
+    CP = get_car(can_recv, lambda _msgs: None, lambda obd: None, params.get_bool("AlphaLongitudinalEnabled"), False, cached_params=cached_params).CP
 
   params.put("CarParams", CP.to_bytes())