diff --git a/src/app/cliente/turnos/page.tsx b/src/app/cliente/turnos/page.tsx
index 4001f03..68bf6f6 100644
--- a/src/app/cliente/turnos/page.tsx
+++ b/src/app/cliente/turnos/page.tsx
@@ -77,6 +77,7 @@ function TurnosContent() {
   const [diaSeleccionado, setDiaSeleccionado] = useState<string | null>(null);
   const [slotSel, setSlotSel] = useState<Slot | null>(null);
   const [kilometros, setKilometros] = useState("");
+  const [kmError, setKmError] = useState("");
   const [reservando, setReservando] = useState(false);
   const [turnoCreado, setTurnoCreado] = useState<Turno | null>(null);
 
@@ -119,10 +120,22 @@ function TurnosContent() {
     setDiaSeleccionado(dateStr);
     setSlotSel(null);
     setKilometros("");
+    setKmError("");
+  }
+
+  function handleKilometros(val: string) {
+    setKilometros(val);
+    if (val === "") {
+      setKmError("");
+    } else if (!/^\d+$/.test(val) || Number(val) < 0) {
+      setKmError("Ingresá solo números enteros positivos");
+    } else {
+      setKmError("");
+    }
   }
 
   async function reservar() {
-    if (!slotSel || !servicioSel || !autoId || !kilometros) return;
+    if (!slotSel || !servicioSel || !autoId || !kilometros || kmError) return;
     setReservando(true);
     const res = await fetch("/api/cliente/turnos", {
       method: "POST",
@@ -341,13 +354,14 @@ function TurnosContent() {
                         Kilometraje actual <span className="text-red-500">*</span>
                       </label>
                       <input
-                        type="number" min={0} placeholder="Ej: 85000"
+                        type="text" inputMode="numeric" placeholder="Ej: 85000"
                         value={kilometros}
-                        onChange={e => setKilometros(e.target.value)}
-                        className="w-full border border-gray-300 rounded-lg px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
+                        onChange={e => handleKilometros(e.target.value)}
+                        className={`w-full border rounded-lg px-3 py-2 text-sm focus:outline-none focus:ring-2 ${kmError ? "border-red-400 focus:ring-red-400" : "border-gray-300 focus:ring-blue-500"}`}
                       />
+                      {kmError && <p className="text-xs text-red-500 mt-1">{kmError}</p>}
                     </div>
-                    <Button onClick={reservar} disabled={!kilometros} loading={reservando} className="w-full">
+                    <Button onClick={reservar} disabled={!kilometros || !!kmError} loading={reservando} className="w-full">
                       Confirmar turno · {horaArg(slotSel.fechaInicio)} – {horaArg(slotSel.fechaFin)}
                     </Button>
                   </div>