Showing results for 
Search instead for 
Did you mean: 
What's DOS?
Posts: 1
Registered: ‎11-04-2013
Location: united states
Views: 6,814
Message 1 of 2

E531 error code 0251

I just purchased e531 68852bu.

When I boot up, I get an error code 0251.

0251: System CMOS Checksum bad - Default configuration used.
Real Time clock Error - Check Date and Time settings

I went to Bios and changed the date & time, which was 01/01/2001.

It does not fix the problem because it just goes back to 01/01/2001 and i still get the same error.

Is this  a hardware failure?

Retired Support Specialist
Posts: 1,090
Registered: ‎09-24-2013
Location: Bangalore
Views: 6,797
Message 2 of 2

Re: E531 error code 0251



Welcome to Lenovo Community Forums!


I'm sorry to hear that you are getting an error message stating “0251: System CMOS Checksum bad - Default configuration used, Real Time clock Error - Check Date and Time settings” while trying to boot your Lenovo ThinkPad E531.


Basically, this error shows up when your CMOS battery runs out of power. Probably, you will have to get your CMOS battery replaced to resolve the issue. Once you replace the backup battery, run BIOS Setup Utility to reset the time and date.


If you can replace the battery on your own, here is the FRU number: 04W4118. I would suggest you to visit here to buy replacement parts. Otherwise, I strongly recommend you to contact our technical support for assistance.


Click here to open a link where you can select the country and get the exact contact support number. I’m sure they will be a great help.


Best Regards,


Did someone help you today? Press the star on the left to thank them with a Kudo!
If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.

Follow @LenovoForums on Twitter!

Check out current deals!

Shop current deals

Top Kudoed Authors