diff --git a/core/libs/prx/libSceAmpr/Export.cpp b/core/libs/prx/libSceAmpr/Export.cpp
index 0f4f9b32a..05a651526 100644
--- a/core/libs/prx/libSceAmpr/Export.cpp
+++ b/core/libs/prx/libSceAmpr/Export.cpp
@@ -624,15 +624,15 @@ int APS5_VABI sceAmprAmmGetVirtualAddressRanges(std::uint64_t* start, std::uint6
 }
 
 int APS5_VABI sceAmprAmmSubmitCommandBuffer(void* base, std::uint32_t offset, std::uint32_t priority) {
-    (void)priority;
-    if (!base) return SCE_KERNEL_ERROR_EINVAL;
+    if (priority > 2u) return SCE_KERNEL_ERROR_EINVAL;
+    if (!base) return SCE_KERNEL_ERROR_EPERM;
     AmmSubmit_nid_no_patch(base, offset);
     return 0;
 }
 
 int APS5_VABI sceAmprAmmSubmitCommandBuffer2(void* base, std::uint32_t offset, std::uint32_t priority, AmmSubmitResult* result, std::uint32_t* id) {
-    (void)priority;
-    if (!base) return SCE_KERNEL_ERROR_EINVAL;
+    if (priority > 2u) return SCE_KERNEL_ERROR_EINVAL;
+    if (!base) return SCE_KERNEL_ERROR_EPERM;
     const auto submitted = AmmSubmit_nid_no_patch(base, offset);
     if (result) *result = {0, 0};
     if (id) *id = submitted;
@@ -640,8 +640,8 @@ int APS5_VABI sceAmprAmmSubmitCommandBuffer2(void* base, std::uint32_t offset, s
 }
 
 int APS5_VABI sceAmprAmmSubmitCommandBuffer3(void* base, std::uint32_t offset, std::uint32_t priority, std::uint32_t* id) {
-    (void)priority;
-    if (!base) return SCE_KERNEL_ERROR_EINVAL;
+    if (priority > 2u) return SCE_KERNEL_ERROR_EINVAL;
+    if (!base) return SCE_KERNEL_ERROR_EPERM;
     const auto submitted = AmmSubmit_nid_no_patch(base, offset);
     if (id) *id = submitted;
     return 0;
diff --git a/core/libs/tests/GuestAmpr.cpp b/core/libs/tests/GuestAmpr.cpp
index 06ba7f696..d06f21ea9 100644
--- a/core/libs/tests/GuestAmpr.cpp
+++ b/core/libs/tests/GuestAmpr.cpp
@@ -646,7 +646,10 @@ void TestAmm() {
     Require(sceAmprAmmCommandBufferUnmap(&exact.buffer, start, page) == 0);
     Require(sceAmprAmmCommandBufferUnmap(&exact.buffer, start, page) == busy);
     Require(sceAmprAmmCommandBufferMap(&exact.buffer, start, page, 0, cpuReadWrite) == busy);
-    Require(sceAmprAmmSubmitCommandBuffer(nullptr, 0, 0) == invalidArgument);
+    Require(sceAmprAmmSubmitCommandBuffer(nullptr, 0, 0) == permissionDenied);
+    Require(sceAmprAmmSubmitCommandBuffer(exact.memory.data(), 0, 3) == invalidArgument);
+    Require(sceAmprAmmSubmitCommandBuffer3(nullptr, 0, 3, nullptr) == invalidArgument);
+    Require(sceAmprAmmSubmitCommandBuffer(exact.memory.data(), 0, 2) == 0);
 
     Require(sceAmprAmmMeasureAmmCommandSizeMap(start, page, 0, 0x04) == ammRejected);
     Require(sceAmprAmmMeasureAmmCommandSizeMapWithGpuMaskId(start + 8, page, 0, cpuReadWrite, 0) == ammRejected);