diff --git a/server/grpc.go b/server/grpc.go
index b93b37fe8..6ed428772 100644
--- a/server/grpc.go
+++ b/server/grpc.go
@@ -66,14 +66,62 @@ func errToStatusError(err error) error {
 
 	// Check error string.
 	switch errors.Cause(err) {
-	case pilosa.ErrIndexNotFound, pilosa.ErrFieldNotFound:
-		return status.Error(codes.NotFound, err.Error())
-	}
-	// Check error type.
-	switch errors.Cause(err).(type) {
-	case pilosa.NotFoundError:
+	case pilosa.ErrIndexNotFound,
+		pilosa.ErrFieldNotFound,
+		pilosa.ErrForeignIndexNotFound,
+		pilosa.ErrBSIGroupNotFound:
 		return status.Error(codes.NotFound, err.Error())
+
+	case pilosa.ErrIndexExists,
+		pilosa.ErrFieldExists,
+		pilosa.ErrBSIGroupExists:
+		return status.Error(codes.AlreadyExists, err.Error())
+
+	case pilosa.ErrIndexRequired,
+		pilosa.ErrFieldRequired,
+		pilosa.ErrColumnRequired,
+		pilosa.ErrBSIGroupNameRequired,
+		pilosa.ErrName,
+		pilosa.ErrQueryRequired,
+		pilosa.ErrFieldsArgumentRequired,
+		pilosa.ErrIntFieldWithKeys,
+		pilosa.ErrDecimalFieldWithKeys:
+		return status.Error(codes.FailedPrecondition, err.Error())
+
+	case pilosa.ErrInvalidView,
+		pilosa.ErrInvalidBSIGroupType,
+		pilosa.ErrInvalidBSIGroupValueType,
+		pilosa.ErrInvalidCacheType:
+		return status.Error(codes.InvalidArgument, err.Error())
+
+	case pilosa.ErrDecimalOutOfRange,
+		pilosa.ErrBSIGroupValueTooLow,
+		pilosa.ErrBSIGroupValueTooHigh,
+		pilosa.ErrInvalidRangeOperation,
+		pilosa.ErrInvalidBetweenValue:
+		return status.Error(codes.OutOfRange, err.Error())
+
+	case pilosa.ErrQueryTimeout:
+		return status.Error(codes.DeadlineExceeded, err.Error())
+
+	case pilosa.ErrQueryCancelled:
+		return status.Error(codes.Canceled, err.Error())
+
+	case pilosa.ErrNotImplemented:
+		return status.Error(codes.Unimplemented, err.Error())
+
+	case pilosa.ErrAborted:
+		return status.Error(codes.Aborted, err.Error())
+
+	case pilosa.ErrClusterDoesNotOwnShard,
+		pilosa.ErrResizeNoReplicas,
+		pilosa.ErrResizeNotRunning,
+		pilosa.ErrNodeNotCoordinator,
+		pilosa.ErrTooManyWrites,
+		pilosa.ErrNodeIDNotExists:
+		return status.Error(codes.Internal, err.Error())
 	}
+
 	return status.Error(codes.Unknown, err.Error())
 }
 
@@ -105,7 +153,7 @@ func (h *GRPCHandler) PostVDS(ctx context.Context, req *pb.PostVDSRequest) (*pb.
 	opts := pilosa.IndexOptions{Keys: req.Keys, TrackExistence: req.TrackExistence}
 	_, err := h.api.CreateIndex(ctx, req.Name, opts)
 	if err != nil {
-		return nil, err
+		return nil, errToStatusError(err)
 	}
 	return &pb.PostVDSResponse{}, nil
 }
@@ -114,7 +162,7 @@ func (h *GRPCHandler) PostVDS(ctx context.Context, req *pb.PostVDSRequest) (*pb.
 func (h *GRPCHandler) DeleteVDS(ctx context.Context, req *pb.DeleteVDSRequest) (*pb.DeleteVDSResponse, error) {
 	err := h.api.DeleteIndex(ctx, req.Name)
 	if err != nil {
-		return nil, err
+		return nil, errToStatusError(err)
 	}
 	return &pb.DeleteVDSResponse{}, nil
 }
diff --git a/sql/reduce.go b/sql/reduce.go
index be0e98695..b349f8ceb 100644
--- a/sql/reduce.go
+++ b/sql/reduce.go
@@ -282,20 +282,20 @@ func (v *ValCountFuncReducer) Reduce(c pproto.StreamClient, s pproto.StreamServe
 	if len(cols) == 0 {
 		return s.Send(pproto.ErrorCode(
 			errors.New("empty column set"),
-			codes.Unknown,
+			codes.NotFound,
 		))
 	}
 
 	if idxVal == -1 {
 		return s.Send(pproto.ErrorCode(
 			errors.New("result set has no column: value"),
-			codes.Unknown,
+			codes.NotFound,
 		))
 	}
 	if idxCnt == -1 {
 		return s.Send(pproto.ErrorCode(
 			errors.New("result set has no column: count"),
-			codes.Unknown,
+			codes.NotFound,
 		))
 	}
 
@@ -415,7 +415,7 @@ func (r *AssignHeadersReducer) Reduce(c pproto.StreamClient, s pproto.StreamServ
 			if len(placement) > len(rr.Columns) {
 				return s.Send(pproto.ErrorCode(
 					errors.New("mismatched header placement and column count"),
-					codes.Unknown,
+					codes.InvalidArgument,
 				))
 			}