diff --git a/linux/devices/ploc/PlocMPSoCHandler.cpp b/linux/devices/ploc/PlocMPSoCHandler.cpp
index 0d943cc2..f1430580 100644
--- a/linux/devices/ploc/PlocMPSoCHandler.cpp
+++ b/linux/devices/ploc/PlocMPSoCHandler.cpp
@@ -830,6 +830,14 @@ size_t PlocMPSoCHandler::getNextReplyLength(DeviceCommandId_t commandId) {
   return replyLen;
 }
 
+ReturnValue_t PlocMPSoCHandler::doSendReadHook() {
+  // Prevent DHB from polling UART during commands executed by the mpsoc helper task
+  if (plocMPSoCHelperExecuting) {
+    return RETURN_FAILED;
+  }
+  return RETURN_OK;
+}
+
 MessageQueueIF* PlocMPSoCHandler::getCommandQueuePtr() { return commandActionHelperQueue; }
 
 void PlocMPSoCHandler::stepSuccessfulReceived(ActionId_t actionId, uint8_t step) { return; }
@@ -840,12 +848,13 @@ void PlocMPSoCHandler::stepFailedReceived(ActionId_t actionId, uint8_t step,
     case supv::START_MPSOC:
       sif::warning << "PlocMPSoCHandler::stepFailedReceived: Failed to start MPSoC" << std::endl;
       powerState = PowerState::OFF;
+      setMode(_MODE_SHUT_DOWN);
       break;
     case supv::SHUTDOWN_MPSOC:
       triggerEvent(MPSOC_SHUTDOWN_FAILED);
       sif::warning << "PlocMPSoCHandler::stepFailedReceived: Failed to shutdown MPSoC" << std::endl;
-      // TODO: Setting state to on or off here?
-      powerState = PowerState::ON;
+      // FDIR will intercept event and switch PLOC power off
+      powerState = PowerState::OFF;
       break;
     default:
       sif::debug << "PlocMPSoCHandler::stepFailedReceived: Received unexpected action reply"
diff --git a/linux/devices/ploc/PlocMPSoCHandler.h b/linux/devices/ploc/PlocMPSoCHandler.h
index d5ea231b..92b5d03f 100644
--- a/linux/devices/ploc/PlocMPSoCHandler.h
+++ b/linux/devices/ploc/PlocMPSoCHandler.h
@@ -76,6 +76,7 @@ class PlocMPSoCHandler : public DeviceHandlerBase, public CommandsActionsIF {
                                       uint8_t expectedReplies = 1, bool useAlternateId = false,
                                       DeviceCommandId_t alternateReplyID = 0) override;
   size_t getNextReplyLength(DeviceCommandId_t deviceCommand) override;
+  virtual ReturnValue_t doSendReadHook() override;
 
  private:
   static const uint8_t SUBSYSTEM_ID = SUBSYSTEM_ID::PLOC_MPSOC_HANDLER;