diff --git a/Gaugecontroller/Gaugecontroller.ino b/Gaugecontroller/Gaugecontroller.ino
index b0fa335..46aa5b8 100644
--- a/Gaugecontroller/Gaugecontroller.ino
+++ b/Gaugecontroller/Gaugecontroller.ino
@@ -552,10 +552,11 @@ bool parseHome(const String& line) {
 bool parseSweep(const String& line) {
   int id; char accelTok[20], speedTok[20];
   if (sscanf(line.c_str(), "SWEEP %d %19s %19s", &id, accelTok, speedTok) == 3) {
-    if (id < 0 || id >= GAUGE_COUNT) { sendReply("ERR BAD_ID"); return true; }
     char* endA; float accel = (float)strtod(accelTok, &endA);
     char* endS; float speed = (float)strtod(speedTok, &endS);
-    if (endA == accelTok || *endA != '\0' || endS == speedTok || *endS != '\0') return false;
+    if (endA == accelTok || *endA != '\0') { sendReply("ERR BAD_ACCEL"); return true; }
+    if (endS == speedTok || *endS != '\0') { sendReply("ERR BAD_SPEED"); return true; }
+    if (id < 0 || id >= GAUGE_COUNT)       { sendReply("ERR BAD_ID");    return true; }
     Gauge& g = gauges[id];
     if (accel <= 0.0f || speed <= 0.0f) {
       g.sweepEnabled = false;