diff --git a/numba_cuda/numba/cuda/cg.py b/numba_cuda/numba/cuda/cg.py
index c3dc4add6..78e3fc6f9 100644
--- a/numba_cuda/numba/cuda/cg.py
+++ b/numba_cuda/numba/cuda/cg.py
@@ -23,6 +23,7 @@ def _this_grid(typingctx):
     sig = signature(grid_group)
 
     def codegen(context, builder, sig, args):
+        context.active_code_library.use_cooperative = True
         one = context.get_constant(types.int32, 1)
         mod = builder.module
         return builder.call(
@@ -45,6 +46,7 @@ def _grid_group_sync(typingctx, group):
     sig = signature(types.int32, group)
 
     def codegen(context, builder, sig, args):
+        context.active_code_library.use_cooperative = True
         flags = context.get_constant(types.int32, 0)
         mod = builder.module
         return builder.call(
diff --git a/numba_cuda/numba/cuda/codegen.py b/numba_cuda/numba/cuda/codegen.py
index cb72c0dc4..804a335ba 100644
--- a/numba_cuda/numba/cuda/codegen.py
+++ b/numba_cuda/numba/cuda/codegen.py
@@ -70,6 +70,8 @@ def __init__(self, codegen, name):
         self._setup_functions = []
         self._teardown_functions = []
 
+        self.use_cooperative = False
+
     @property
     def modules(self):
         # There are no LLVM IR modules in an ExternalCodeLibrary
@@ -181,6 +183,8 @@ def __init__(
         self._nvvm_options = nvvm_options
         self._entry_name = entry_name
 
+        self.use_cooperative = False
+
     @property
     def llvm_strs(self):
         if self._llvm_strs is None:
@@ -352,6 +356,7 @@ def add_linking_library(self, library):
         self._linking_files.update(library._linking_files)
         self._setup_functions.extend(library._setup_functions)
         self._teardown_functions.extend(library._teardown_functions)
+        self.use_cooperative |= library.use_cooperative
 
     def add_linking_file(self, path_or_obj):
         if isinstance(path_or_obj, LinkableCode):
@@ -442,6 +447,7 @@ def _reduce_states(self):
             nvvm_options=self._nvvm_options,
             needs_cudadevrt=self.needs_cudadevrt,
             nrt=nrt,
+            use_cooperative=self.use_cooperative,
         )
 
     @classmethod
@@ -458,6 +464,7 @@ def _rebuild(
         nvvm_options,
         needs_cudadevrt,
         nrt,
+        use_cooperative,
     ):
         """
         Rebuild an instance.
@@ -472,6 +479,7 @@ def _rebuild(
         instance._max_registers = max_registers
         instance._nvvm_options = nvvm_options
         instance.needs_cudadevrt = needs_cudadevrt
+        instance.use_cooperative = use_cooperative
 
         instance._finalized = True
         if nrt:
diff --git a/numba_cuda/numba/cuda/compiler.py b/numba_cuda/numba/cuda/compiler.py
index ae3eac5cf..9dc2d464f 100644
--- a/numba_cuda/numba/cuda/compiler.py
+++ b/numba_cuda/numba/cuda/compiler.py
@@ -797,7 +797,7 @@ def compile_ptx_for_current_device(
     )
 
 
-def declare_device_function(name, restype, argtypes, link):
+def declare_device_function(name, restype, argtypes, link, use_cooperative):
     from .descriptor import cuda_target
 
     typingctx = cuda_target.typing_context
@@ -816,6 +816,7 @@ def declare_device_function(name, restype, argtypes, link):
     lib = ExternalCodeLibrary(f"{name}_externals", targetctx.codegen())
     for file in link:
         lib.add_linking_file(file)
+    lib.use_cooperative = use_cooperative
 
     # ExternalFunctionDescriptor provides a lowering implementation for calling
     # external functions
diff --git a/numba_cuda/numba/cuda/cudadecl.py b/numba_cuda/numba/cuda/cudadecl.py
index a15dacde2..e2cca3316 100644
--- a/numba_cuda/numba/cuda/cudadecl.py
+++ b/numba_cuda/numba/cuda/cudadecl.py
@@ -423,7 +423,11 @@ def _genfp16_binary_operator(op):
 def _resolve_wrapped_unary(fname):
     link = tuple()
     decl = declare_device_function(
-        f"__numba_wrapper_{fname}", types.float16, (types.float16,), link
+        f"__numba_wrapper_{fname}",
+        types.float16,
+        (types.float16,),
+        link,
+        use_cooperative=False,
     )
     return types.Function(decl)
 
@@ -438,6 +442,7 @@ def _resolve_wrapped_binary(fname):
             types.float16,
         ),
         link,
+        use_cooperative=False,
     )
     return types.Function(decl)
 
diff --git a/numba_cuda/numba/cuda/decorators.py b/numba_cuda/numba/cuda/decorators.py
index 71d8ce3d4..e13cabda8 100644
--- a/numba_cuda/numba/cuda/decorators.py
+++ b/numba_cuda/numba/cuda/decorators.py
@@ -229,7 +229,7 @@ def autojitwrapper(func):
                 return disp
 
 
-def declare_device(name, sig, link=None):
+def declare_device(name, sig, link=None, use_cooperative=False):
     """
     Declare the signature of a foreign function. Returns a descriptor that can
     be used to call the function from a Python kernel.
@@ -238,6 +238,7 @@ def declare_device(name, sig, link=None):
     :type name: str
     :param sig: The Numba signature of the function.
     :param link: External code to link when calling the function.
+    :param use_cooperative: External code requires cooperative launch.
     """
     if link is None:
         link = tuple()
@@ -250,6 +251,8 @@ def declare_device(name, sig, link=None):
         msg = "Return type must be provided for device declarations"
         raise TypeError(msg)
 
-    template = declare_device_function(name, restype, argtypes, link)
+    template = declare_device_function(
+        name, restype, argtypes, link, use_cooperative
+    )
 
     return template.key
diff --git a/numba_cuda/numba/cuda/dispatcher.py b/numba_cuda/numba/cuda/dispatcher.py
index 1eba085c3..236c6970f 100644
--- a/numba_cuda/numba/cuda/dispatcher.py
+++ b/numba_cuda/numba/cuda/dispatcher.py
@@ -151,8 +151,8 @@ def __init__(
 
         asm = lib.get_asm_str()
 
-        # A kernel needs cooperative launch if grid_sync is being used.
-        self.cooperative = "cudaCGGetIntrinsicHandle" in asm
+        # The code library contains functions that require cooperative launch.
+        self.cooperative = lib.use_cooperative
         # We need to link against cudadevrt if grid sync is being used.
         if self.cooperative:
             lib.needs_cudadevrt = True
diff --git a/numba_cuda/numba/cuda/tests/cudapy/cache_usecases.py b/numba_cuda/numba/cuda/tests/cudapy/cache_usecases.py
index c9f7c6975..428af9432 100644
--- a/numba_cuda/numba/cuda/tests/cudapy/cache_usecases.py
+++ b/numba_cuda/numba/cuda/tests/cudapy/cache_usecases.py
@@ -203,18 +203,6 @@ def simple_usecase_kernel(r, x):
 simple_usecase_caller = CUDAUseCase(simple_usecase_kernel)
 
 
-# Usecase with cooperative groups
-
-
-@cuda.jit(cache=True)
-def cg_usecase_kernel(r, x):
-    grid = cuda.cg.this_grid()
-    grid.sync()
-
-
-cg_usecase = CUDAUseCase(cg_usecase_kernel)
-
-
 class _TestModule(CUDATestCase):
     """
     Tests for functionality of this module's functions.
diff --git a/numba_cuda/numba/cuda/tests/cudapy/cg_cache_usecases.py b/numba_cuda/numba/cuda/tests/cudapy/cg_cache_usecases.py
new file mode 100644
index 000000000..0d652ab80
--- /dev/null
+++ b/numba_cuda/numba/cuda/tests/cudapy/cg_cache_usecases.py
@@ -0,0 +1,33 @@
+from numba import cuda
+from numba.cuda.testing import CUDATestCase
+import sys
+
+from numba.cuda.tests.cudapy.cache_usecases import CUDAUseCase
+
+
+# Usecase with cooperative groups
+
+
+@cuda.jit(cache=True)
+def cg_usecase_kernel(r, x):
+    grid = cuda.cg.this_grid()
+    grid.sync()
+
+
+cg_usecase = CUDAUseCase(cg_usecase_kernel)
+
+
+class _TestModule(CUDATestCase):
+    """
+    Tests for functionality of this module's functions.
+    Note this does not define any "test_*" method, instead check_module()
+    should be called by hand.
+    """
+
+    def check_module(self, mod):
+        mod.cg_usecase(0)
+
+
+def self_test():
+    mod = sys.modules[__name__]
+    _TestModule().check_module(mod)
diff --git a/numba_cuda/numba/cuda/tests/cudapy/test_caching.py b/numba_cuda/numba/cuda/tests/cudapy/test_caching.py
index d8002207e..3ebaf40a0 100644
--- a/numba_cuda/numba/cuda/tests/cudapy/test_caching.py
+++ b/numba_cuda/numba/cuda/tests/cudapy/test_caching.py
@@ -1,8 +1,6 @@
 import multiprocessing
 import os
 import shutil
-import subprocess
-import sys
 import unittest
 import warnings
 
@@ -163,55 +161,6 @@ def test_same_names(self):
         f = mod.renamed_function2
         self.assertPreciseEqual(f(2), 8)
 
-    @skip_unless_cc_60
-    @skip_if_cudadevrt_missing
-    @skip_if_mvc_enabled("CG not supported with MVC")
-    def test_cache_cg(self):
-        # Functions using cooperative groups should be cacheable. See Issue
-        # #8888: https://github.com/numba/numba/issues/8888
-        self.check_pycache(0)
-        mod = self.import_module()
-        self.check_pycache(0)
-
-        mod.cg_usecase(0)
-        self.check_pycache(2)  # 1 index, 1 data
-
-        # Check the code runs ok from another process
-        self.run_in_separate_process()
-
-    @skip_unless_cc_60
-    @skip_if_cudadevrt_missing
-    @skip_if_mvc_enabled("CG not supported with MVC")
-    def test_cache_cg_clean_run(self):
-        # See Issue #9432: https://github.com/numba/numba/issues/9432
-        # If a cached function using CG sync was the first thing to compile,
-        # the compile would fail.
-        self.check_pycache(0)
-
-        # This logic is modelled on run_in_separate_process(), but executes the
-        # CG usecase directly in the subprocess.
-        code = """if 1:
-            import sys
-
-            sys.path.insert(0, %(tempdir)r)
-            mod = __import__(%(modname)r)
-            mod.cg_usecase(0)
-            """ % dict(tempdir=self.tempdir, modname=self.modname)
-
-        popen = subprocess.Popen(
-            [sys.executable, "-c", code],
-            stdout=subprocess.PIPE,
-            stderr=subprocess.PIPE,
-        )
-        out, err = popen.communicate(timeout=60)
-        if popen.returncode != 0:
-            raise AssertionError(
-                "process failed with code %s: \n"
-                "stdout follows\n%s\n"
-                "stderr follows\n%s\n"
-                % (popen.returncode, out.decode(), err.decode()),
-            )
-
     def _test_pycache_fallback(self):
         """
         With a disabled __pycache__, test there is a working fallback
@@ -275,6 +224,40 @@ def f():
                 pass
 
 
+@skip_on_cudasim("Simulator does not implement caching")
+class CUDACooperativeGroupTest(SerialMixin, DispatcherCacheUsecasesTest):
+    # See Issue #9432: https://github.com/numba/numba/issues/9432
+    # If a cached function using CG sync was the first thing to compile,
+    # the compile would fail.
+    here = os.path.dirname(__file__)
+    usecases_file = os.path.join(here, "cg_cache_usecases.py")
+    modname = "cuda_cooperative_caching_test_fodder"
+
+    def setUp(self):
+        DispatcherCacheUsecasesTest.setUp(self)
+        CUDATestCase.setUp(self)
+
+    def tearDown(self):
+        CUDATestCase.tearDown(self)
+        DispatcherCacheUsecasesTest.tearDown(self)
+
+    @skip_unless_cc_60
+    @skip_if_cudadevrt_missing
+    @skip_if_mvc_enabled("CG not supported with MVC")
+    def test_cache_cg(self):
+        # Functions using cooperative groups should be cacheable. See Issue
+        # #8888: https://github.com/numba/numba/issues/8888
+        self.check_pycache(0)
+        mod = self.import_module()
+        self.check_pycache(0)
+
+        mod.cg_usecase(0)
+        self.check_pycache(2)  # 1 index, 1 data
+
+        # Check the code runs ok from another process
+        self.run_in_separate_process()
+
+
 @skip_on_cudasim("Simulator does not implement caching")
 class CUDAAndCPUCachingTest(SerialMixin, DispatcherCacheUsecasesTest):
     here = os.path.dirname(__file__)
diff --git a/numba_cuda/numba/cuda/tests/cudapy/test_cooperative_groups.py b/numba_cuda/numba/cuda/tests/cudapy/test_cooperative_groups.py
index c50b1ac52..2769b726e 100644
--- a/numba_cuda/numba/cuda/tests/cudapy/test_cooperative_groups.py
+++ b/numba_cuda/numba/cuda/tests/cudapy/test_cooperative_groups.py
@@ -1,8 +1,13 @@
 from __future__ import print_function
 
+import os
+
+import cffi
+
 import numpy as np
 
 from numba import config, cuda, int32
+from numba.types import CPointer
 from numba.cuda.testing import (
     unittest,
     CUDATestCase,
@@ -11,6 +16,9 @@
     skip_if_cudadevrt_missing,
     skip_if_mvc_enabled,
 )
+from numba.core.typing import signature
+
+ffi = cffi.FFI()
 
 
 @cuda.jit
@@ -149,6 +157,32 @@ def test_max_cooperative_grid_blocks(self):
         self.assertEqual(blocks1d, blocks2d)
         self.assertEqual(blocks1d, blocks3d)
 
+    @skip_unless_cc_60
+    def test_external_cooperative_func(self):
+        cudapy_test_path = os.path.dirname(__file__)
+        tests_path = os.path.dirname(cudapy_test_path)
+        data_path = os.path.join(tests_path, "data")
+        src = os.path.join(data_path, "cta_barrier.cu")
+
+        sig = signature(
+            CPointer(int32),
+        )
+        cta_barrier = cuda.declare_device(
+            "cta_barrier", sig=sig, link=[src], use_cooperative=True
+        )
+
+        @cuda.jit
+        def kernel():
+            cta_barrier()
+
+        block_size = 32
+        grid_size = 1024
+
+        kernel[grid_size, block_size]()
+
+        overload = kernel.overloads[()]
+        self.assertTrue(overload.cooperative)
+
 
 if __name__ == "__main__":
     unittest.main()
diff --git a/numba_cuda/numba/cuda/tests/data/cta_barrier.cu b/numba_cuda/numba/cuda/tests/data/cta_barrier.cu
new file mode 100644
index 000000000..e51b7e0a1
--- /dev/null
+++ b/numba_cuda/numba/cuda/tests/data/cta_barrier.cu
@@ -0,0 +1,23 @@
+#include <cooperative_groups.h>
+#include <cuda/barrier>
+
+namespace cg = cooperative_groups;
+
+__device__ void _wait_on_tile(cuda::barrier<cuda::thread_scope_block> &tile)
+{
+    auto token = tile.arrive();
+    tile.wait(std::move(token));
+}
+
+extern "C"
+__device__ int cta_barrier(int *ret) {
+    auto cta = cg::this_thread_block();
+    cg::thread_block_tile<32> tile = cg::tiled_partition<32>(cta);
+    __shared__ cuda::barrier<cuda::thread_scope_block> barrier;
+    if (threadIdx.x == 0) {
+        init(&barrier, blockDim.x);
+    }
+
+    _wait_on_tile(barrier);
+    return 0;
+}