diff --git a/java_console/autotest/src/com/rusefi/IoUtil.java b/java_console/autotest/src/com/rusefi/IoUtil.java
index 63d74cf380..5e7f2297b6 100644
--- a/java_console/autotest/src/com/rusefi/IoUtil.java
+++ b/java_console/autotest/src/com/rusefi/IoUtil.java
@@ -43,8 +43,6 @@ public class IoUtil {
     static void sendCommand(String command, int retryTimeoutMs, int totalTimeoutSeconds) {
         final CountDownLatch responseLatch = new CountDownLatch(1);
         long time = System.currentTimeMillis();
-        if (LinkManager.hasError())
-            throw new IllegalStateException("IO error");
         FileLog.MAIN.logLine("Sending command [" + command + "]");
         final long begin = System.currentTimeMillis();
         CommandQueue.getInstance().write(command, retryTimeoutMs, new InvocationConfirmationListener() {
@@ -57,8 +55,6 @@ public class IoUtil {
         wait(responseLatch, totalTimeoutSeconds);
         if (responseLatch.getCount() > 0)
             FileLog.MAIN.logLine("No confirmation in " + retryTimeoutMs);
-        if (LinkManager.hasError())
-            throw new IllegalStateException("IO error");
         FileLog.MAIN.logLine("Command [" + command + "] executed in " + (System.currentTimeMillis() - time));
     }
 
diff --git a/java_console/io/src/com/rusefi/io/LinkConnector.java b/java_console/io/src/com/rusefi/io/LinkConnector.java
index b151bdd7c9..bafce296b6 100644
--- a/java_console/io/src/com/rusefi/io/LinkConnector.java
+++ b/java_console/io/src/com/rusefi/io/LinkConnector.java
@@ -11,18 +11,13 @@ public interface LinkConnector extends LinkDecoder {
         }
 
         @Override
-        public void send(String command, boolean fireEvent) throws InterruptedException {
+        public void send(String command, boolean fireEvent) {
         }
 
         @Override
         public void restart() {
         }
 
-        @Override
-        public boolean hasError() {
-            return false;
-        }
-
         @Override
         public String unpack(String packet) {
             return LinkDecoder.TEXT_PROTOCOL_DECODER.unpack(packet);
@@ -35,5 +30,4 @@ public interface LinkConnector extends LinkDecoder {
 
     void restart();
 
-    boolean hasError();
 }
diff --git a/java_console/io/src/com/rusefi/io/LinkManager.java b/java_console/io/src/com/rusefi/io/LinkManager.java
index 873d53b08c..9dc375cf31 100644
--- a/java_console/io/src/com/rusefi/io/LinkManager.java
+++ b/java_console/io/src/com/rusefi/io/LinkManager.java
@@ -162,10 +162,6 @@ public class LinkManager {
         return connector.unpack(packet);
     }
 
-    public static boolean hasError() {
-        return connector.hasError();
-    }
-
     public static String unpackConfirmation(String message) {
         if (message.startsWith(CommandQueue.CONFIRMATION_PREFIX))
             return message.substring(CommandQueue.CONFIRMATION_PREFIX.length());
diff --git a/java_console/io/src/com/rusefi/io/serial/PortHolder.java b/java_console/io/src/com/rusefi/io/serial/PortHolder.java
index a376b99838..804b44d6e0 100644
--- a/java_console/io/src/com/rusefi/io/serial/PortHolder.java
+++ b/java_console/io/src/com/rusefi/io/serial/PortHolder.java
@@ -23,12 +23,11 @@ public class PortHolder {
     private static final DataListener dataListener = freshData -> LinkManager.engineState.processNewData(new String(freshData), LinkManager.ENCODER);
 
     public ConnectionStateListener listener;
-    private static PortHolder instance = new PortHolder();
     private final Object portLock = new Object();
 
     private BinaryProtocol bp;
 
-    private PortHolder() {
+    protected PortHolder() {
     }
 
     @Nullable
@@ -88,8 +87,4 @@ public class PortHolder {
 
         bp.doSend(command, fireEvent);
     }
-
-    public static PortHolder getInstance() {
-        return instance;
-    }
 }
diff --git a/java_console/io/src/com/rusefi/io/serial/SerialConnector.java b/java_console/io/src/com/rusefi/io/serial/SerialConnector.java
index db9d14f233..0f3633f862 100644
--- a/java_console/io/src/com/rusefi/io/serial/SerialConnector.java
+++ b/java_console/io/src/com/rusefi/io/serial/SerialConnector.java
@@ -5,27 +5,29 @@ import com.rusefi.core.MessagesCentral;
 import com.rusefi.io.ConnectionStateListener;
 import com.rusefi.io.LinkConnector;
 import com.rusefi.io.LinkManager;
-import com.sun.corba.se.spi.activation.ServerHolder;
 
 /**
  * @author Andrey Belomutskiy
  *         3/3/14
  */
 public class SerialConnector implements LinkConnector {
+
+    private final PortHolder portHolder = new PortHolder();
+
     public SerialConnector(String serialPort) {
-        PortHolder.getInstance().port = serialPort;
+        portHolder.port = serialPort;
     }
 
     @Override
     public void connect(ConnectionStateListener listener) {
         FileLog.MAIN.logLine("SerialConnector: connecting");
-        PortHolder.getInstance().listener = listener;
+        portHolder.listener = listener;
         FileLog.MAIN.logLine("scheduleOpening");
         LinkManager.COMMUNICATION_EXECUTOR.execute(new Runnable() {
             @Override
             public void run() {
                 FileLog.MAIN.logLine("scheduleOpening>openPort");
-                PortHolder.getInstance().connectAndReadConfiguration();
+                portHolder.connectAndReadConfiguration();
             }
         });
     }
@@ -36,19 +38,12 @@ public class SerialConnector implements LinkConnector {
             @Override
             public void run() {
                 MessagesCentral.getInstance().postMessage(getClass(), "Restarting serial IO");
-//                if (closed)
-//                    return;
-                PortHolder.getInstance().close();
-                PortHolder.getInstance().connectAndReadConfiguration();
+                portHolder.close();
+                portHolder.connectAndReadConfiguration();
             }
         });
     }
 
-    @Override
-    public boolean hasError() {
-        return false;
-    }
-
     @Override
     public String unpack(String packet) {
         return packet;
@@ -56,6 +51,6 @@ public class SerialConnector implements LinkConnector {
 
     @Override
     public void send(String text, boolean fireEvent) throws InterruptedException {
-        PortHolder.getInstance().packAndSend(text, fireEvent);
+        portHolder.packAndSend(text, fireEvent);
     }
 }
diff --git a/java_console/io/src/com/rusefi/io/tcp/TcpConnector.java b/java_console/io/src/com/rusefi/io/tcp/TcpConnector.java
index 5d0c8f6be8..d8e8f7d972 100644
--- a/java_console/io/src/com/rusefi/io/tcp/TcpConnector.java
+++ b/java_console/io/src/com/rusefi/io/tcp/TcpConnector.java
@@ -132,11 +132,6 @@ public class TcpConnector implements LinkConnector {
     public void restart() {
     }
 
-    @Override
-    public boolean hasError() {
-        return false;
-    }
-
     @Override
     public String unpack(String packet) {
         return packet;