diff --git a/selfdrive/car/docs_definitions.py b/selfdrive/car/docs_definitions.py
index 5865e789b1..4e11832287 100644
--- a/selfdrive/car/docs_definitions.py
+++ b/selfdrive/car/docs_definitions.py
@@ -146,7 +146,14 @@ class Harness(Enum):
   hyundai_o = "Hyundai O"
   custom = "Developer"
   obd_ii = "OBD-II"
-  gm_cam = "GM Camera"
+  gm_cam = "GM Camera" 
+  # TODO: Submit PR for gm cam harness schematic(s), diagrams and board layout(s) to https://github.com/commaai/neo/tree/master/car_harness
+  # Note: GM cam harness _without low-speed GMLAN support_ is simple and similar to the others
+  #       JJS - I anticipate comma to be able to take over production easily
+  #       It also doesn't make sense for customers to get the Developer harness - they typically don't need the wires
+  # Note 2: JJS - I anticipate designing a camera harness with a low-speed GMLAN gateway (design borrowed from OBD2 harness),
+  #         unless comma plans to do so
+  # Note 3: JJS - I anticipate an eventual 
   nissan_a = "Nissan A"
   nissan_b = "Nissan B"
   mazda = "Mazda"
diff --git a/selfdrive/car/gm/interface.py b/selfdrive/car/gm/interface.py
index 92a06a6236..9414987efc 100755
--- a/selfdrive/car/gm/interface.py
+++ b/selfdrive/car/gm/interface.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 from cereal import car
 from math import fabs
+from panda import Panda
 
 from common.conversions import Conversions as CV
 from selfdrive.car import STD_CARGO_KG, create_button_enable_events, create_button_event, scale_rot_inertia, scale_tire_stiffness, gen_empty_fingerprint, get_safety_config
@@ -10,10 +11,12 @@ from selfdrive.car.interfaces import CarInterfaceBase
 ButtonType = car.CarState.ButtonEvent.Type
 EventName = car.CarEvent.EventName
 GearShifter = car.CarState.GearShifter
+TransmissionType = car.CarParams.TransmissionType
+NetworkLocation = car.CarParams.NetworkLocation
 BUTTONS_DICT = {CruiseButtons.RES_ACCEL: ButtonType.accelCruise, CruiseButtons.DECEL_SET: ButtonType.decelCruise,
                 CruiseButtons.MAIN: ButtonType.altButton3, CruiseButtons.CANCEL: ButtonType.cancel}
 
-
+GM_PARAM_HW_CAM = 1
 class CarInterface(CarInterfaceBase):
   @staticmethod
   def get_pid_accel_limits(CP, current_speed, cruise_speed):
@@ -48,6 +51,8 @@ class CarInterface(CarInterfaceBase):
     ret.safetyConfigs = [get_safety_config(car.CarParams.SafetyModel.gm)]
     ret.pcmCruise = False  # For ASCM, stock cruise control is kept off (but not ACC)
     ret.radarOffCan = False  # For ASCM, radar is expected
+    ret.transmissionType = TransmissionType.automatic # or direct for EV
+    ret.networkLocation = NetworkLocation.gateway # or fwdCamera
 
     # These cars have been put into dashcam only due to both a lack of users and test coverage.
     # These cars likely still work fine. Once a user confirms each car works and a test route is
@@ -81,6 +86,7 @@ class CarInterface(CarInterfaceBase):
     ret.minEnableSpeed = 18 * CV.MPH_TO_MS
 
     if candidate == CAR.VOLT:
+      ret.transmissionType = TransmissionType.direct
       ret.mass = 1607. + STD_CARGO_KG
       ret.wheelbase = 2.69
       ret.steerRatio = 17.7  # Stock 15.7, LiveParameters
@@ -93,7 +99,7 @@ class CarInterface(CarInterfaceBase):
       ret.lateralTuning.pid.kiV = [0.]
       ret.lateralTuning.pid.kf = 1. # get_steer_feedforward_volt()
       ret.steerActuatorDelay = 0.2
-
+      
     elif candidate == CAR.MALIBU:
       ret.mass = 1496. + STD_CARGO_KG
       ret.wheelbase = 2.83
@@ -133,11 +139,55 @@ class CarInterface(CarInterfaceBase):
       ret.wheelbase = 3.302
       ret.steerRatio = 17.3
       ret.centerToFront = ret.wheelbase * 0.49
+      
       ret.lateralTuning.pid.kiBP, ret.lateralTuning.pid.kpBP = [[10., 41.0], [10., 41.0]]
       ret.lateralTuning.pid.kpV, ret.lateralTuning.pid.kiV = [[0.13, 0.24], [0.01, 0.02]]
       ret.lateralTuning.pid.kf = 0.000045
       tire_stiffness_factor = 1.0
 
+    elif candidate == CAR.SILVERADO:
+      ret.minEnableSpeed = -1.
+      ret.minSteerSpeed = -1 * CV.MPH_TO_MS
+      ret.mass = 2400. + STD_CARGO_KG
+      ret.wheelbase = 3.745
+      ret.steerRatio = 16.3
+      ret.centerToFront = ret.wheelbase * .49
+      ret.steerRateCost = .4
+      ret.steerActuatorDelay = 0.11
+      ret.networkLocation = NetworkLocation.fwdCamera # Uses Cam Harness
+      ret.radarOffCan = True # No Radar
+      ret.openpilotLongitudinalControl = False # Stock ACC
+      ret.pcmCruise = True # CC is on
+
+      ######################   Get tune
+
+    elif candidate == CAR.BOLT_EUV:
+      ret.transmissionType = TransmissionType.direct
+      ret.minEnableSpeed = -1
+      ret.minSteerSpeed = 5 * CV.MPH_TO_MS
+      ret.mass = 1616. + STD_CARGO_KG
+      ret.wheelbase = 2.60096
+      ret.steerRatio = 16.8
+      ret.steerRatioRear = 0.
+      ret.centerToFront = 2.0828 #ret.wheelbase * 0.4 # wild guess
+      tire_stiffness_factor = 1.0
+      
+      ret.networkLocation = NetworkLocation.fwdCamera # Uses Cam Harness
+      ret.radarOffCan = True # No Radar
+      ret.openpilotLongitudinalControl = False # Stock ACC
+      ret.pcmCruise = True # CC is on
+      
+      ret.steerRateCost = 0.5
+      ret.steerActuatorDelay = 0.
+      ret.lateralTuning.pid.kpBP, ret.lateralTuning.pid.kiBP = [[10., 41.0], [10., 41.0]]
+      ret.lateralTuning.pid.kpV, ret.lateralTuning.pid.kiV = [[0.18, 0.275], [0.01, 0.021]]
+      ret.lateralTuning.pid.kf = 0.0002
+
+    # Set Panda to camera forwarding mode
+    if ret.networkLocation == NetworkLocation.fwdCamera:
+      # TODO: Depends on Panda PR #962 (Cam Harness forwarding, stock ACC)
+      ret.safetyConfigs[0].safetyParam |= Panda.FLAG_GM_HW_CAM
+
     # TODO: get actual value, for now starting with reasonable value for
     # civic and scaling by mass and wheelbase
     ret.rotationalInertia = scale_rot_inertia(ret.mass, ret.wheelbase)
@@ -154,7 +204,7 @@ class CarInterface(CarInterfaceBase):
     ret = self.CS.update(self.cp, self.cp_loopback)
 
     ret.steeringRateLimited = self.CC.steer_rate_limited if self.CC is not None else False
-
+    # TODO: Depends on OP PR #24764 (Switch to ECMPRDNL2)
     if self.CS.cruise_buttons != self.CS.prev_cruise_buttons and self.CS.prev_cruise_buttons != CruiseButtons.INIT:
       be = create_button_event(self.CS.cruise_buttons, self.CS.prev_cruise_buttons, BUTTONS_DICT, CruiseButtons.UNPRESS)
 
@@ -163,8 +213,10 @@ class CarInterface(CarInterfaceBase):
         be.type = ButtonType.unknown
 
       ret.buttonEvents = [be]
-
-    events = self.create_common_events(ret, pcm_enable=False)
+    # TODO: Depends on 
+    events = self.create_common_events(ret, extra_gears = [GearShifter.sport, GearShifter.low,
+                                                           GearShifter.eco, GearShifter.manumatic],
+                                       pcm_enable=self.CP.pcmCruise)
 
     if ret.vEgo < self.CP.minEnableSpeed:
       events.add(EventName.belowEngageSpeed)
@@ -174,7 +226,7 @@ class CarInterface(CarInterfaceBase):
       events.add(car.CarEvent.EventName.belowSteerSpeed)
 
     # handle button presses
-    events.events.extend(create_button_enable_events(ret.buttonEvents))
+    events.events.extend(create_button_enable_events(ret.buttonEvents, pcm_cruise=self.CP.pcmCruise))
 
     ret.events = events.to_msg()
 
diff --git a/selfdrive/car/gm/values.py b/selfdrive/car/gm/values.py
index fdb6e4ddd5..caf6105c4c 100644
--- a/selfdrive/car/gm/values.py
+++ b/selfdrive/car/gm/values.py
@@ -9,8 +9,13 @@ Ecu = car.CarParams.Ecu
 
 
 class CarControllerParams:
-  STEER_MAX = 300  # Safety limit, not LKA max. Trucks use 600.
-  STEER_STEP = 2  # control frames per command
+  # TODO: Different cars have different min steer speed, usually around 3-5 mph
+  # TODO: Delta up and down limits may require adjustment based on excessive rate limiting
+  # TODO: Min steer speed seems to be about 3 MPH; may differ per car
+  # TODO: Unsure of driver values
+  # TODO: MAX_GAS, ZERO_GAS and MAX_BRAKE, MAX_ACC_REGEN are based on a specific volt year...
+  STEER_MAX = 300  # GM LKAS max (input) torque is 3 Nm
+  STEER_STEP = 2  # control frames per command (50 Hz or every 20ms)
   STEER_DELTA_UP = 7
   STEER_DELTA_DOWN = 17
   MIN_STEER_SPEED = 3.  # m/s
@@ -67,9 +72,8 @@ class Footnote(Enum):
     "Currently Requires a [harness box](https://comma.ai/shop/products/harness-box) and [community built GM camera harness]" +
     "(https://github.com/commaai/openpilot/wiki/GMCamHarness)",
     Column.MODEL)
-  # STOCK_ACC = CarFootnote(
-  #   "Supported configuration uses stock ACC",
-  #   Column.MODEL)
+
+# TODO: Submit PR for gm cam harness schematic(s), diagrams and board layout(s) to https://github.com/commaai/neo/tree/master/car_harness
 
 
 @dataclass
@@ -90,10 +94,6 @@ CAR_INFO: Dict[str, Union[GMCarInfo, List[GMCarInfo]]] = {
   CAR.BOLT_EUV: GMCarInfo("Chevrolet Bolt EUV Premier 2022", "Chevy Safety Assist", footnotes=[Footnote.CAM_HARNESS], harness=Harness.gm_cam),
 }
 
-# Use CarParams Transmission Type Direct
-#EV_CAR = {CAR.VOLT, CAR.BOLT_EUV}
-# Use CarParams connect location
-#CAM_CAR = {CAR.SILVERADO, CAR.BOLT_EUV}
 
 class CruiseButtons:
   INIT = 0