diff --git a/pt2001/include/rusefi/pt2001.h b/pt2001/include/rusefi/pt2001.h
index c03d2fa..f313dbc 100644
--- a/pt2001/include/rusefi/pt2001.h
+++ b/pt2001/include/rusefi/pt2001.h
@@ -14,6 +14,18 @@
 
 void initMc33816();
 
+enum class McFault : uint8_t
+{
+    None = 0,
+    NoFlash = 1,
+    UnderVoltageAfter = 2,
+    NoComm = 3,
+    flag0 = 4,
+    UnderVoltage5 = 5,
+    Driven = 6,
+    UnderVoltage7 = 7,
+};
+
 class Pt2001Base {
 public:
 	// Reinitialize the PT2001 chip, returns true if successful
@@ -22,12 +34,18 @@ public:
 	// Disable the PT2001 chip.
 	void shutdown();
 
+	void onError(McFault fault) {
+	    this->fault = fault;
+	}
+
 	// Re-read timing configuration and reconfigure the chip. This is safe to call while operating.
 	void setTimings();
 
 	// Set the boost voltage target. This is safe to call while operating.
 	void setBoostVoltage(float volts);
 
+    McFault fault = McFault::None;
+
 private:
 	// SPI tx/rx helpers
 	void send(uint16_t tx) {
diff --git a/pt2001/src/pt2001.cpp b/pt2001/src/pt2001.cpp
index 6ae9de0..292bdc1 100644
--- a/pt2001/src/pt2001.cpp
+++ b/pt2001/src/pt2001.cpp
@@ -436,14 +436,14 @@ bool Pt2001Base::restart() {
 	clearDriverStatus(); // Initial clear necessary
 	uint16_t status = readDriverStatus();
 	if (checkUndervoltV5(status)) {
-		onError("MC33 5V Under-Voltage!");
+		onError(McFault::UnderVoltage5);
 		shutdown();
 		return false;
 	}
 
 	uint16_t chipId = readId();
 	if (!validateChipId(chipId)) {
-		onError("No comm with MC33");
+		onError(McFault::NoComm);
 		shutdown();
 		return false;
 	}
@@ -456,7 +456,7 @@ bool Pt2001Base::restart() {
 	// current configuration of REG_MAIN would toggle flag0 from LOW to HIGH
 	flag0after = readFlag0();
 	if (flag0before || !flag0after) {
-		onError("MC33 flag0 transition no buena");
+		onError(McFault::flag0);
 		shutdown();
 		return false;
 	}
@@ -475,14 +475,14 @@ bool Pt2001Base::restart() {
 	sleepMs(10);
 
 	if (!checkFlash()) {
-		onError("MC33 no flash");
+		onError(McFault::NoFlash);
 		shutdown();
 		return false;
 	}
 
 	status = readDriverStatus();
 	if (checkUndervoltVccP(status)) {
-		onError("MC33 VccP (7V) Under-Voltage!");
+		onError(McFault::UnderVoltage7);
 		shutdown();
 		return false;
 	}
@@ -492,14 +492,14 @@ bool Pt2001Base::restart() {
 	sleepMs(10); // Give it a moment
 	status = readDriverStatus();
 	if (!checkDrivenEnabled(status)) {
-		onError("MC33 Driven did not stick!");
+		onError(McFault::Driven);
 		shutdown();
 		return false;
 	}
 
 	status = readDriverStatus();
 	if (checkUndervoltVccP(status)) {
-		onError("MC33 VccP Under-Voltage After Driven"); // Likely DC-DC LS7 is dead!
+		onError(McFault::UnderVoltageAfter); // Likely DC-DC LS7 is dead!
 		shutdown();
 		return false;
 	}