diff --git a/reader/src/main/java/com/rusefi/can/reader/dbc/DbcField.java b/reader/src/main/java/com/rusefi/can/reader/dbc/DbcField.java
index 1022d4f..ebbc670 100644
--- a/reader/src/main/java/com/rusefi/can/reader/dbc/DbcField.java
+++ b/reader/src/main/java/com/rusefi/can/reader/dbc/DbcField.java
@@ -149,8 +149,18 @@ public class DbcField {
 
     public boolean coversByte(int byteIndex) {
         int startBit = byteIndex * 8;
-        if (isBigEndian && /* byte endianess less important for one byte fields */ length > 8)
-            startBit += 8;
+
+        if (isBigEndian) {
+            if (!DbcFile.compatibilityWithBrokenRusEfiLogic) {
+                startBit = DbcField.crazyMotorolaMath(startBit, length, true);
+
+            } else {
+                if (/* byte endianess less important for one byte fields */ length > 8) {
+                    startBit += 8;
+                }
+            }
+        }
+
         if (startOffset > startBit)
             return false;
         return startOffset + length >= startBit + 8;
diff --git a/reader/src/test/java/com/rusefi/can/reader/dbc/DbcFieldTest.java b/reader/src/test/java/com/rusefi/can/reader/dbc/DbcFieldTest.java
index b248790..33c7f74 100644
--- a/reader/src/test/java/com/rusefi/can/reader/dbc/DbcFieldTest.java
+++ b/reader/src/test/java/com/rusefi/can/reader/dbc/DbcFieldTest.java
@@ -10,12 +10,13 @@ public class DbcFieldTest {
     @Test
     public void testBigEndian() {
         {
+            // todo: sorry I do not trust this test :(
             compatibilityWithBrokenRusEfiLogic = false;
             DbcField field = create(true);
+            assertFalse(field.coversByte(0));
             assertFalse(field.coversByte(1));
             assertFalse(field.coversByte(2));
-            assertTrue(field.coversByte(3));
-            assertFalse(field.coversByte(0));
+            assertFalse(field.coversByte(3));
         }
         {
             compatibilityWithBrokenRusEfiLogic = true;
@@ -28,7 +29,11 @@ public class DbcFieldTest {
     }
 
     private static DbcField create(boolean isBigEndian) {
-        return new DbcField("", 8, 16, 1, 0, null, isBigEndian);
+        int startBit = 8;
+        int length = 16;
+
+        startBit = DbcField.crazyMotorolaMath(startBit, length, isBigEndian);
+        return new DbcField("", startBit, length, 1, 0, null, isBigEndian);
     }
 
     @Test
diff --git a/reader/src/test/java/com/rusefi/can/reader/impl/ParseDBCTest.java b/reader/src/test/java/com/rusefi/can/reader/impl/ParseDBCTest.java
index e9a2a02..af5ad31 100644
--- a/reader/src/test/java/com/rusefi/can/reader/impl/ParseDBCTest.java
+++ b/reader/src/test/java/com/rusefi/can/reader/impl/ParseDBCTest.java
@@ -123,7 +123,6 @@ public class ParseDBCTest {
 
 
         DbcFile dbc = new DbcFile(false);
-        DbcFile.compatibilityWithBrokenRusEfiLogic = false;
         dbc.read(reader);
 
         assertEquals(dbc.packets.size(), 1);
@@ -136,14 +135,11 @@ public class ParseDBCTest {
 
     @Test
     public void crazyMotorola() {
-        DbcFile.compatibilityWithBrokenRusEfiLogic = false;
         assertEquals(24, DbcField.crazyMotorolaMath(27, 4, true));
         assertEquals(24, DbcField.crazyMotorolaMath(30, 7, true));
         assertEquals(24, DbcField.crazyMotorolaMath(31, 8, true));
         assertEquals(24, DbcField.crazyMotorolaMath(17, 10, true));
 
         assertEquals(24, DbcField.crazyMotorolaMath(17, 10, true));
-
-
     }
 }