diff --git a/pkg/errors/sdk_errors.go b/pkg/errors/sdk_errors.go
index e039310e24..7a70a2b5df 100644
--- a/pkg/errors/sdk_errors.go
+++ b/pkg/errors/sdk_errors.go
@@ -5,19 +5,16 @@ package errors
 
 import (
 	"encoding/json"
-	"errors"
 	"fmt"
+	"io"
 	"net/http"
 )
 
-const err = "error"
+const errorKey = "error"
 
 var (
-	// ErrJSONErrKey indicates response body did not contain erorr message.
-	errJSONKey = New("response body expected error message json key not found")
-
-	// ErrUnknown indicates that an unknown error was found in the response body.
-	errUnknown = New("unknown error")
+	// Failed to read response body.
+	errRespBody = New("failed to read response body")
 )
 
 // SDKError is an error type for Mainflux SDK.
@@ -79,17 +76,19 @@ func CheckError(resp *http.Response, expectedStatusCodes ...int) SDKError {
 		}
 	}
 
-	var content map[string]interface{}
-	if err := json.NewDecoder(resp.Body).Decode(&content); err != nil {
-		return NewSDKErrorWithStatus(err, resp.StatusCode)
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return NewSDKErrorWithStatus(Wrap(errRespBody, err), resp.StatusCode)
 	}
+	var content map[string]interface{}
+	_ = json.Unmarshal(body, &content)
 
-	if msg, ok := content[err]; ok {
+	if msg, ok := content[errorKey]; ok {
 		if v, ok := msg.(string); ok {
-			return NewSDKErrorWithStatus(errors.New(v), resp.StatusCode)
+			return NewSDKErrorWithStatus(New(v), resp.StatusCode)
 		}
-		return NewSDKErrorWithStatus(errUnknown, resp.StatusCode)
+		return NewSDKErrorWithStatus(fmt.Errorf("%v", msg), resp.StatusCode)
 	}
 
-	return NewSDKErrorWithStatus(errJSONKey, resp.StatusCode)
+	return NewSDKErrorWithStatus(New(string(body)), resp.StatusCode)
 }
diff --git a/pkg/sdk/go/message_test.go b/pkg/sdk/go/message_test.go
index 3111f6f077..4a93487ff9 100644
--- a/pkg/sdk/go/message_test.go
+++ b/pkg/sdk/go/message_test.go
@@ -19,8 +19,6 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-const eof = "EOF"
-
 func newMessageService(cc policies.AuthServiceClient) adapter.Service {
 	pub := mocks.NewPublisher()
 
@@ -72,7 +70,7 @@ func TestSendMessage(t *testing.T) {
 			chanID: chanID,
 			msg:    msg,
 			auth:   invalidToken,
-			err:    errors.NewSDKErrorWithStatus(errors.New(eof), http.StatusUnauthorized),
+			err:    errors.NewSDKErrorWithStatus(errors.New(""), http.StatusUnauthorized),
 		},
 		"publish message with wrong content type": {
 			chanID: chanID,
@@ -90,7 +88,7 @@ func TestSendMessage(t *testing.T) {
 			chanID: chanID,
 			msg:    msg,
 			auth:   "invalid-token",
-			err:    errors.NewSDKErrorWithStatus(errors.New(eof), http.StatusUnauthorized),
+			err:    errors.NewSDKErrorWithStatus(errors.New(""), http.StatusUnauthorized),
 		},
 	}
 	for desc, tc := range cases {