diff --git a/controllers/main.py b/controllers/main.py
index 3a589ac2979..0def9e81217 100644
--- a/controllers/main.py
+++ b/controllers/main.py
@@ -10,8 +10,10 @@ class WebsiteSale(WebsiteSale):
     def pricelist(self, promo, **post):
         order = request.website.sale_get_order()
         coupon_status = request.env['sale.coupon.apply.code'].sudo().apply_coupon(order, promo)
-        if coupon_status.get('error', False):
+        if coupon_status.get('not_found'):
             return super(WebsiteSale, self).pricelist(promo, **post)
+        elif coupon_status.get('error'):
+            request.session['error_promo_code'] = coupon_status['error']
         return request.redirect(post.get('r', '/shop/cart'))
 
     @http.route(['/shop/payment'], type='http', auth="public", website=True)
@@ -19,3 +21,9 @@ class WebsiteSale(WebsiteSale):
         order = request.website.sale_get_order()
         order.recompute_coupon_lines()
         return super(WebsiteSale, self).payment(**post)
+
+    @http.route(['/shop/cart'], type='http', auth="public", website=True)
+    def cart(self, **post):
+        order = request.website.sale_get_order()
+        order.recompute_coupon_lines()
+        return super(WebsiteSale, self).cart(**post)
diff --git a/models/__init__.py b/models/__init__.py
index 6819ceab9a0..a603e535975 100644
--- a/models/__init__.py
+++ b/models/__init__.py
@@ -2,4 +2,5 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
 from . import sale_coupon_rule
-from . import sale_order
\ No newline at end of file
+from . import sale_order
+from . import website
diff --git a/models/sale_order.py b/models/sale_order.py
index 7bc53960d0a..3effee6a17c 100644
--- a/models/sale_order.py
+++ b/models/sale_order.py
@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 from odoo import models, fields, api
+from odoo.http import request
 
 
 class SaleOrder(models.Model):
@@ -10,3 +11,9 @@ class SaleOrder(models.Model):
         for order in self:
             reward_lines = order.website_order_line.filtered(lambda line: line.is_reward_line)
             order.cart_quantity -= int(sum(reward_lines.mapped('product_uom_qty')))
+
+    def get_promo_code_error(self, delete=True):
+        error = request.session.get('error_promo_code')
+        if error and delete:
+            request.session.pop('error_promo_code')
+        return error
diff --git a/models/website.py b/models/website.py
new file mode 100644
index 00000000000..37f93c7f64b
--- /dev/null
+++ b/models/website.py
@@ -0,0 +1,12 @@
+# -*- coding: utf-8 -*-
+from odoo import models, fields, api
+
+
+class Website(models.Model):
+    _inherit = "website"
+
+    @api.multi
+    def sale_get_order(self, force_create=False, code=None, update_pricelist=False, force_pricelist=False):
+        order = super(Website, self).sale_get_order(force_create, code, update_pricelist, force_pricelist)
+        order.recompute_coupon_lines()
+        return order
diff --git a/views/website_sale_templates.xml b/views/website_sale_templates.xml
index db139ad39a8..033201102d0 100644
--- a/views/website_sale_templates.xml
+++ b/views/website_sale_templates.xml
@@ -47,6 +47,13 @@
                 </div>
             </div>
         </t>
+        <t t-if="website_sale_order.get_promo_code_error(delete=False)">
+            <div class="panel panel-danger mt16">
+                <div class="panel-heading clearfix">
+                    <span class="pull-left"><t t-esc="website_sale_order.get_promo_code_error()" /></span>
+                </div>
+            </div>
+        </t>
     </xpath>
     <xpath expr="//t[@name='code_not_available']" position="replace"/>
 </template>