diff --git a/pt2001/include/rusefi/pt2001.h b/pt2001/include/rusefi/pt2001.h
index 7743061..61fcb63 100644
--- a/pt2001/include/rusefi/pt2001.h
+++ b/pt2001/include/rusefi/pt2001.h
@@ -26,6 +26,8 @@ enum class McFault : uint8_t
     UnderVoltage7 = 7,
 };
 
+const char * mcFaultToString(McFault fault);
+
 class Pt2001Base {
 public:
 	// Reinitialize the PT2001 chip, returns true if successful
diff --git a/pt2001/src/pt2001.cpp b/pt2001/src/pt2001.cpp
index 64f54b1..fe3d8c0 100644
--- a/pt2001/src/pt2001.cpp
+++ b/pt2001/src/pt2001.cpp
@@ -411,6 +411,18 @@ void Pt2001Base::downloadRegister(int r_target) {
 // 	initMc33816IfNeeded();
 // }
 
+const char * mcFaultToString(McFault fault) {
+    switch (fault) {
+        case McFault::NoComm:
+            return "NoComm";
+        case McFault::UnderVoltageAfter:
+            return "UnderVoltageAfter";
+        default:
+            return "TODO";
+    }
+    return "TODO";
+}
+
 void Pt2001Base::shutdown() {
 	setDriveEN(false); // ensure HV is off
 	setResetB(false);  // turn off the chip