diff --git a/DiagnosticTask.c b/DiagnosticTask.c
index ef32a08..f6eab12 100644
--- a/DiagnosticTask.c
+++ b/DiagnosticTask.c
@@ -44,7 +44,7 @@ static uint32_t diagnostic_UDS_ReadDTCInformation_19_1(tDiagnostic *env, void *e
     uint32_t countDTC = 0;
 
     for (uint8_t i = 0; i < COUNT_DTC_CODE_ERROR; ++i) {
-        if (dtc_state_error[i] & (~diagnosticDTC->mask)) {
+        if (dtc_state_error[i] & (diagnosticDTC->mask)) {
             ++countDTC;
         }
     }
@@ -59,11 +59,11 @@ static uint32_t diagnostic_UDS_ReadDTCInformation_19_2(tDiagnostic *env, void *e
     uint32_t size = 0;
 
     for (uint8_t i = 0; i < COUNT_DTC_CODE_ERROR; ++i) {
-        if (dtc_state_error[i] & (~diagnosticDTC->mask)) {
+        if (dtc_state_error[i] & (diagnosticDTC->mask)) {
             diagnosticDTC->dataResponse[size] = dtc_codes[i].DTCHighByte;
             diagnosticDTC->dataResponse[size + 1] = dtc_codes[i].DTCMiddleByte;
             diagnosticDTC->dataResponse[size + 2] = dtc_codes[i].DTCLowByte;
-            diagnosticDTC->dataResponse[size + 3] = dtc_state_error[i] & (~diagnosticDTC->mask);
+            diagnosticDTC->dataResponse[size + 3] = dtc_state_error[i] & (diagnosticDTC->mask);
             size += 4;
         }
     }