I keep getting an error code 51331. cannot get an internet access on my wii

From the Nintendo support pages...
Error Code 51330 51332 Wii Wii mini Nintendo Support

From Nintendo:
Error Code 51330, 51331, and 51332

It appears that the wireless security pass code for your home network may have been changed or is entered incorrectly on the Wii console. Click here for more information about WEP and WPA security, including how to access the settings for your Access Point.

If your wireless network password isn't wrong, reply. Hope this helps somewhat.

(From Nintendo's Customer Service website: http://www.nintendo.com/consumer/wfc/en_na/ds/results.jsp?error_code=51331&system=Wii&locale=en_US)

Error Code: 51331

Unable to connect to your wireless network

Likely cause: It appears that the password (also known as a WPA or WEP key) entered into the Wii console is not the same as what your wireless router is set to allow.

How to fix: Make sure the password is entered into the Wii exactly as it appears in your router's settings. Security keys are case sensitive.

Don't know how to find your router's password?Look for a sticker on the bottom of your router. Many routers provided by Internet service providers have their default password located on a sticker on the bottom of the router.

If you're not able to locate the password here, select the brand of your router below and we'll show you how to access your router's settings.

Sorry to hear you are having problems with your wii. According to Nintendo, error code 51331 is:
Error Code: 51331

Unable to connect to your wireless network

This error code is more specific to having incorrect security settings on your wii. Your encryption key is wrong when trying to connect to your wireless internet. Double check your encryption key with your router's settings and try again.

You can see the official support article from Nintendo here:
http://www.nintendo.com/consumer/wfc/en_na/ds/results.jsp?error_code=51331&system=Wii&locale=lang

Hello rjcs4 and welcome to FixYa. The error code for the Nintendo Wii 51331 means you have a issue with your wireless security. Make sure your routers WEP Key matches that of your Nintendo Wii. This should solve the problem. I hope this was helpful and good luck.

Wii Error Code 51331 means there is a problem with wireless security.
Make sure your router’s WEP/WPA (one or the other not both)key matches the WEP/WPA Key you entered in the Wii.
If you double checked the WEP/WPA key with the router and the Wii and they match, but you still receive the Wii Error Code 51331, then MAC filtering may be enabled in the router. You will have to add your Wii’s MAC address to the router’s allowed list. You can do this by logging into your router and going to the “access control, access list, or network filter” settings.
If you still have trouble with Wii Error Code 51331, try changing the wireless router’s channel to 1 or 11.

You have to have a good internet that can go fast. IF you had any power out problems, you probably have to reset the Wii internet again. Hope that helps.

If you got error code 51331, this basically means you can't connect to the Internet because of wireless interference.

Try these:
Move your router away from metal objects such as metal cabinets, and place it in a central location in your home.

Do not use other wireless devices while trying to connect to the Internet.

Avoid devices that use a 2.4GHz radio frequency. Look for devices that use a 5.8GHz or 900MHz frequency.

Change the channel on your router to 1 or 11, as these don't overlap.

If you have encyrption on your router, make the WEP/WPA key is correct.

Change the mode on your router to "mixed" or "b/g" mode.

Hope this helps!

Wii Error Code 51331 means there is a problem with wireless security.
Make sure your router’s WEP key matches the WEP Key you entered in the Wii.
If your router is using 64-bit encryption, the WEP Key must be 10 characters.
For 128-bit encryption, the WEP Key must be 26 characters.
WEP Keys can only use the characters 0-9 and A-F.
If your router allows more than one WEP key to be entered at a time, make sure the key you’re using is on slot one.
If you double checked the WEP or WPA key with the router and the Wii and they match, but you still receive the Wii Error Code 51331, then MAC filtering may be enabled in the router. You will have to add your Wii’s MAC address to the router’s allowed list. You can do this by logging into your router and going to the “access control, access list, or network filter” settings.
If you still have trouble with Wii Error Code 51331, try changing the wireless router’s channel to 1 or 11. This may increase download speed.
Check Nintendo’s router page for special notes on your router if available. Follow the instructions of the special notes.
Your wireless router must broadcast in mixed or b/g mode and cannot be set to “g” only mode.
If you still encounter the Wii Error Code 51331, try doing manually setting up the Wii’s internet connection. You can find your network information to enter into the Wii by doing this:
On your PC, click “Start” and then “Run.”
Type “CMD” into the field that appears to open a new window.
Type “IPCONFIG/ALL” and press “Enter” to display a list of internet settings. Locate the settings asked for by the Wii console during the Manual Setup process and enter them.
Power cycle the wireless router and modem by unplugging both from the wall. After waiting a minute, plug the modem back in and wait another couple of minutes for the modem to initialize. Plug the router in and wait for the router to initialize. Now try reconnecting the Wii to Nintendo WiFi Connection.

Hope this helps a little

Wii Error Code 51331 means there is a problem with wireless security.

Make sure your router’s WEP key matches the WEP Key you entered in the Wii.
If your router is using 64-bit encryption, the WEP Key must be 10 characters.
For 128-bit encryption, the WEP Key must be 26 characters.
WEP Keys can only use the characters 0-9 and A-F.
If your router allows more than one WEP key to be entered at a time, make sure the key you’re using is on slot one.

If you double checked the WEP or WPA key with the router and the Wii and they match, but you still receive the Wii Error Code 51331, then MAC filtering may be enabled in the router. You will have to add your Wii’s MAC address to the router’s allowed list. You can do this by logging into your router and going to the “access control, access list, or network filter” settings.

If you still have trouble with Wii Error Code 51331, try changing the wireless router’s channel to 1 or 11. This may increase download speed.

Check Nintendo’s router page for special notes on your router if available. Follow the instructions of the special notes.

Your wireless router must broadcast in mixed or b/g mode and cannot be set to “g” only mode.