diff --git a/CMakeLists.txt b/CMakeLists.txt
index b49f5af..07d6ca1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -62,7 +62,7 @@ FetchContent_MakeAvailable(Boost)
 FetchContent_Declare(
   isobus
   GIT_REPOSITORY https://github.com/Open-Agriculture/AgIsoStack-plus-plus.git
-  GIT_TAG c0e1ebb06a2ad9d5bf86c98b3d028ab8fa350130
+  GIT_TAG 1d081d9a9df61e256015efda3683d15c8fa3d580
   DOWNLOAD_EXTRACT_TIMESTAMP TRUE)
 FetchContent_MakeAvailable(isobus)
 
diff --git a/include/app.hpp b/include/app.hpp
index 6ee3ca7..8bc4ce5 100644
--- a/include/app.hpp
+++ b/include/app.hpp
@@ -92,7 +92,6 @@ class Application
 	std::unique_ptr<isobus::VirtualTerminalClientUpdateHelper> vtUpdateHelper;
 	std::vector<std::uint8_t> vtObjectPool;
 	bool vtClientStarted = false;
-	bool canHardwareStarted = false; ///< CANHardwareInterface::start() succeeded, so stop() has a thread to stop
 	bool vtConfigSynced = false;
 	bool vtWasConnected = false;
 	bool vtConnectionWarningLogged = false;
diff --git a/src/app.cpp b/src/app.cpp
index ed61f32..0d2586c 100644
--- a/src/app.cpp
+++ b/src/app.cpp
@@ -195,10 +195,10 @@ bool Application::setup_can_hardware()
 	isobus::CANHardwareInterface::set_number_of_can_channels(1);
 	isobus::CANHardwareInterface::assign_can_channel_frame_handler(0, canDriver);
 
-	canHardwareStarted = isobus::CANHardwareInterface::start();
-	if ((!canHardwareStarted) || (!canDriver->get_is_valid()))
+	if ((!isobus::CANHardwareInterface::start()) || (!canDriver->get_is_valid()))
 	{
-		log() << "Failed to start CAN hardware interface." << std::endl;
+		const std::string reason = canDriver->get_last_error();
+		log() << "Failed to start CAN hardware interface." << (reason.empty() ? "" : " " + reason) << std::endl;
 		return false;
 	}
 
@@ -1448,7 +1448,9 @@ void Application::stop()
 	{
 		tcServer->terminate();
 	}
-	if (canHardwareStarted)
+	// start() also starts the update thread when the driver fails to open, so check is_running()
+	// rather than whether start() succeeded.
+	if (isobus::CANHardwareInterface::is_running())
 	{
 		isobus::CANHardwareInterface::stop();
 	}