diff --git a/lib/active_shipping/carriers/stamps.rb b/lib/active_shipping/carriers/stamps.rb
index b41ba6869..2fdad0d77 100644
--- a/lib/active_shipping/carriers/stamps.rb
+++ b/lib/active_shipping/carriers/stamps.rb
@@ -492,7 +492,9 @@ def parse_fault(fault, response_options)
       end
 
       # Renew the Authenticator if it has expired and retry the request
-      if error_code && error_code.downcase == '002b0202'
+      # Error code reference:
+      # http://developer.stamps.com/assets/documents/developer/downloads/Stamps.com_SWSIM_Reference_v42.pdf
+      if error_code && ['002b0202', '002b0203', '002b0204'].include?(error_code.downcase)
         request = renew_authenticator(last_request)
         commit(last_swsim_method, request)
       else