diff --git a/selfdrive/car/gm/carcontroller.py b/selfdrive/car/gm/carcontroller.py
index 199b6a5c3268e6..be0ca64ccb1996 100644
--- a/selfdrive/car/gm/carcontroller.py
+++ b/selfdrive/car/gm/carcontroller.py
@@ -4,7 +4,7 @@
 from selfdrive.boardd.boardd import can_list_to_can_capnp
 from selfdrive.car import apply_std_steer_torque_limits
 from selfdrive.car.gm import gmcan
-from selfdrive.car.gm.values import CAR, DBC, AccState
+from selfdrive.car.gm.values import CAR, DBC
 from selfdrive.can.packer import CANPacker
 
 
@@ -29,11 +29,11 @@ def __init__(self, car_fingerprint):
     self.ADAS_KEEPALIVE_STEP = 10
     # pedal lookups, only for Volt
     MAX_GAS = 3072              # Only a safety limit
-    self.ZERO_GAS = 2048
+    ZERO_GAS = 2048
     MAX_BRAKE = 350             # Should be around 3.5m/s^2, including regen
     self.MAX_ACC_REGEN = 1404  # ACC Regen braking is slightly less powerful than max regen paddle
     self.GAS_LOOKUP_BP = [-0.25, 0., 0.5]
-    self.GAS_LOOKUP_V = [self.MAX_ACC_REGEN, self.ZERO_GAS, MAX_GAS]
+    self.GAS_LOOKUP_V = [self.MAX_ACC_REGEN, ZERO_GAS, MAX_GAS]
     self.BRAKE_LOOKUP_BP = [-1., -0.25]
     self.BRAKE_LOOKUP_V = [MAX_BRAKE, 0]
 
@@ -83,6 +83,7 @@ def update(self, sendcan, enabled, CS, frame, actuators, \
       return
 
     P = self.params
+
     # Send CAN commands.
     can_sends = []
     canbus = self.canbus
@@ -130,18 +131,12 @@ def update(self, sendcan, enabled, CS, frame, actuators, \
       if (frame % 4) == 0:
         idx = (frame / 4) % 4
 
-        car_stopping = apply_gas < P.ZERO_GAS
-        standstill = CS.pcm_acc_status == AccState.STANDSTILL
-        at_full_stop = enabled and standstill and car_stopping
-        near_stop = enabled and (CS.v_ego < P.NEAR_STOP_BRAKE_PHASE) and car_stopping
+        at_full_stop = enabled and CS.standstill
+        near_stop = enabled and (CS.v_ego < P.NEAR_STOP_BRAKE_PHASE)
         can_sends.append(gmcan.create_friction_brake_command(self.packer_ch, canbus.chassis, apply_brake, idx, near_stop, at_full_stop))
 
-        # Auto-resume from full stop by resetting ACC control
-        acc_enabled = enabled
-        if standstill and not car_stopping:
-          acc_enabled = False
-
-        can_sends.append(gmcan.create_gas_regen_command(self.packer_pt, canbus.powertrain, apply_gas, idx, acc_enabled, at_full_stop))
+        at_full_stop = enabled and CS.standstill
+        can_sends.append(gmcan.create_gas_regen_command(self.packer_pt, canbus.powertrain, apply_gas, idx, enabled, at_full_stop))
 
       # Send dashboard UI commands (ACC status), 25hz
       if (frame % 4) == 0:
diff --git a/selfdrive/car/gm/gmcan.py b/selfdrive/car/gm/gmcan.py
index 6db69bad592768..47b0d8b38dfad4 100644
--- a/selfdrive/car/gm/gmcan.py
+++ b/selfdrive/car/gm/gmcan.py
@@ -60,15 +60,17 @@ def create_gas_regen_command(packer, bus, throttle, idx, acc_engaged, at_full_st
 
 def create_friction_brake_command(packer, bus, apply_brake, idx, near_stop, at_full_stop):
 
-  mode = 0x1
-  if apply_brake > 0:
+  if apply_brake == 0:
+    mode = 0x1
+  else:
     mode = 0xa
 
-  if near_stop:
-    mode = 0xb
-
-  if at_full_stop:
-    mode = 0xd
+    if at_full_stop:
+      mode = 0xd
+    # TODO: this is to have GM bringing the car to complete stop,
+    # but currently it conflicts with OP controls, so turned off.
+    #elif near_stop:
+    #  mode = 0xb
 
   brake = (0x1000 - apply_brake) & 0xfff
   checksum = (0x10000 - (mode << 12) - brake - idx) & 0xffff
diff --git a/selfdrive/car/gm/interface.py b/selfdrive/car/gm/interface.py
index f7fb42a391f089..27d94b885b4af7 100755
--- a/selfdrive/car/gm/interface.py
+++ b/selfdrive/car/gm/interface.py
@@ -193,7 +193,7 @@ def update(self, c):
     ret.cruiseState.available = bool(self.CS.main_on)
     cruiseEnabled = self.CS.pcm_acc_status != 0
     ret.cruiseState.enabled = cruiseEnabled
-    ret.cruiseState.standstill = False
+    ret.cruiseState.standstill = self.CS.pcm_acc_status == 4
 
     ret.leftBlinker = self.CS.left_blinker_on
     ret.rightBlinker = self.CS.right_blinker_on
@@ -276,6 +276,8 @@ def update(self, c):
         events.append(create_event('pedalPressed', [ET.NO_ENTRY, ET.USER_DISABLE]))
       if ret.gasPressed:
         events.append(create_event('pedalPressed', [ET.PRE_ENABLE]))
+      if ret.cruiseState.standstill:
+        events.append(create_event('resumeRequired', [ET.WARNING]))
 
       # handle button presses
       for b in ret.buttonEvents:
diff --git a/selfdrive/car/gm/values.py b/selfdrive/car/gm/values.py
index 62529ed6d73578..8e93b677c8ae66 100644
--- a/selfdrive/car/gm/values.py
+++ b/selfdrive/car/gm/values.py
@@ -12,12 +12,6 @@ class CruiseButtons:
   MAIN        = 5
   CANCEL      = 6
 
-class AccState:
-  OFF        = 0
-  ACTIVE     = 1
-  FAULTED    = 3
-  STANDSTILL = 4
-
 def is_eps_status_ok(eps_status, car_fingerprint):
   valid_eps_status = []
   if car_fingerprint == CAR.VOLT:
@@ -55,7 +49,6 @@ def parse_gear_shifter(can_gear):
 
 STEER_THRESHOLD = 1.0
 
-
 STOCK_CONTROL_MSGS = {
   CAR.VOLT: [384, 715], # 384 = "ASCMLKASteeringCmd", 715 = "ASCMGasRegenCmd"
   CAR.CADILLAC_CT6: [], # Cadillac does not require ASCMs to be disconnected