Question : Voltage sensor detected a failure on DELL PowerEdge 2650 server

Hi;

When I looked at my system log of Windows Server 2K8, I saw the following message but when I looked at the "DELL OpenServer Manager Administrator" application,, it shows everything normal under Voltages group,

Reading from OpenServer Manager
 Reading : 3.152 V  
 Minimum Failure Threshold : 2.720 V  
 Maximum Failure Threshold : 4.000 V

Message from Event Log:
Voltage sensor detected a failure value Sensor location: ESM MB Bat Volt Chassis location: Main System Chassis Previous state was: OK (Normal) Voltage sensor value (in Volts): 2.496

Answer : Voltage sensor detected a failure on DELL PowerEdge 2650 server

Is the DRAC/ESM firmware up to date?