PowerEdge: 16G - 0V Reading On CPU VCCD Voltage Regulators

Summary: Some Dell PowerEdge 16th Generation (16G) servers may exhibit a 0V reading for Central Processing Unit (CPU) Voltage Regulator sensors within the Integrated Dell Remote Access Controller 9 (iDRAC9) user interfaces. ...

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Symptoms

Some Dell PowerEdge 16th Generation (16G) servers may exhibit a 0V reading for CPU VCCD Voltage Regulator sensors within the iDRAC9 user interfaces.

The 0V value can be read through all iDRAC9 management interfaces.
 

iDRAC9 UI >> System >> Overview >> Voltages Example: 

iDRAC9 UI >> System >> Overview >> Voltages Example

 


REDFISH GET Example: 

GET redfish/v1/Chassis/System.Embedded.1/Sensors/CPU1VCCDVR

{
    "@odata.context": "/redfish/v1/$metadata#Sensor.Sensor",
    "@odata.id": "/redfish/v1/Chassis/System.Embedded.1/Sensors/CPU1VCCDVR",
    "@odata.type": "#Sensor.v1_9_0.Sensor",
    "Name": "CPU1 VCCD VR",
    "Id": "CPU1VCCDVR",
    "Description": "Instance of Sensor Id",
    "ReadingType": "Voltage",
    "ReadingUnits": "V",
    "Status": {
        "Health": "OK",
        "State": "Enabled"
    },
    "Reading": 0.0,
    "PhysicalContext": "CPU",
    "Oem": {
        "Dell": {
            "@odata.type": "#DellOemSensor.v1_0_0.DellOemSensor",
            "CurrentState": "Normal",
            "DeviceID": "iDRAC.Embedded.1#CPU1VCCDVR",

Cause

The root cause of the 0V reading on CPU VCCD voltage regulators is due to some 16G systems planners being equipped with alternate supplier voltage regulators that do not support the I2C protocol that iDRAC leverages for these readings.
iDRAC9 cannot differentiate between voltage regulator vendors to support multiple I2C protocols, resulting in the 0V reading.

Resolution

This 0V reading is a cosmetic sighting with no impact to the function of the voltage regulator (VR).
iDRAC9 cannot provide reading for the VR when this alternate vendor part is present and cannot offer a method to confirm which vendor's VR is present.
 

Affected Products

iDRAC9 - 7.xx Series, OEMR R660, OEMR XL R660, OEMR R660xs, OEMR R760, OEMR R760xa, OEMR R760XD2, OEMR XL R760, OEMR R760xs, OEMR R860, OEMR R960, OEMR T560, OEMR XL R660xs, OEMR XL R760xs, OEMR XR5610, OEMR XR7620, OEMR XR8000r, PowerEdge MX760c , PowerEdge R660, PowerEdge R660xs, PowerEdge R760, PowerEdge R760XA, PowerEdge R760xd2, PowerEdge R760xs, PowerEdge R860, PowerEdge R960, PowerEdge T560, PowerEdge XE8640, PowerEdge XE9640, PowerEdge XE9680, PowerEdge XE9680L, PowerEdge XR5610, PowerEdge XR7620, PowerEdge XR8000r, PowerFlex appliance R660, PowerFlex appliance R760, PowerFlex custom node R660, PowerFlex custom node R760, PowerFlex custom node R860, Dell vSAN Ready Node MX760c, vSAN Ready Node R660, Dell EMC vSAN R760 Ready Node ...
Article Properties
Article Number: 000309893
Article Type: Solution
Last Modified: 23 مايو 2026
Version:  4
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