<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2016-10-26</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0000764811</issuerCik>
        <issuerName>CommunityOne Bancorp</issuerName>
        <issuerTradingSymbol>COB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001548624</rptOwnerCik>
            <rptOwnerName>Carlyle Group Management L.L.C.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THE CARLYLE GROUP</rptOwnerStreet1>
            <rptOwnerStreet2>1001 PENNSYLVANIA AVE. NW, SUITE 220S</rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20004</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001475444</rptOwnerCik>
            <rptOwnerName>TC Group Cayman Investment Holdings, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O INTERTRUST CORPORATE SERVICES</rptOwnerStreet1>
            <rptOwnerStreet2>190 ELGIN AVENUE</rptOwnerStreet2>
            <rptOwnerCity>GEORGE TOWN, GRAND CAYMAN</rptOwnerCity>
            <rptOwnerState>E9</rptOwnerState>
            <rptOwnerZipCode>KY1-9005</rptOwnerZipCode>
            <rptOwnerStateDescription>CAYMAN ISLANDS</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001548636</rptOwnerCik>
            <rptOwnerName>TC Group Cayman Investment Holdings Sub L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O INTERTRUST CORPORATE SERVICES</rptOwnerStreet1>
            <rptOwnerStreet2>190 ELGIN AVENUE</rptOwnerStreet2>
            <rptOwnerCity>GEORGE TOWN, GRAND CAYMAN</rptOwnerCity>
            <rptOwnerState>E9</rptOwnerState>
            <rptOwnerZipCode>KY1-9005</rptOwnerZipCode>
            <rptOwnerStateDescription>CAYMAN ISLANDS</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001502382</rptOwnerCik>
            <rptOwnerName>Carlyle Financial Services, Ltd.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O INTERTRUST CORPORATE SERVICES</rptOwnerStreet1>
            <rptOwnerStreet2>190 ELGIN AVENUE</rptOwnerStreet2>
            <rptOwnerCity>GEORGE TOWN, GRAND CAYMAN</rptOwnerCity>
            <rptOwnerState></rptOwnerState>
            <rptOwnerZipCode>KY1-9005</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001502381</rptOwnerCik>
            <rptOwnerName>TCG Financial Services, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O INTERTRUST CORPORATE SERVICES</rptOwnerStreet1>
            <rptOwnerStreet2>190 ELGIN AVENUE</rptOwnerStreet2>
            <rptOwnerCity>GEORGE TOWN, GRAND CAYMAN</rptOwnerCity>
            <rptOwnerState></rptOwnerState>
            <rptOwnerZipCode>KY1-9005</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001502383</rptOwnerCik>
            <rptOwnerName>Carlyle Financial Services Harbor, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THE CARLYLE GROUP,</rptOwnerStreet1>
            <rptOwnerStreet2>1001 PENNSYLVANIA AVE. NW, SUITE 220S</rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20004</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001527166</rptOwnerCik>
            <rptOwnerName>Carlyle Group L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THE CARLYLE GROUP,</rptOwnerStreet1>
            <rptOwnerStreet2>1001 PENNSYLVANIA AVE. NW, SUITE 220 S</rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20004</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001548629</rptOwnerCik>
            <rptOwnerName>Carlyle Holdings II GP L.L.C.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THE CARLYLE GROUP,</rptOwnerStreet1>
            <rptOwnerStreet2>1001 PENNSYLVANIA AVE. NW, SUITE 220S</rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20004</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001548630</rptOwnerCik>
            <rptOwnerName>Carlyle Holdings II L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THE CARLYLE GROUP,</rptOwnerStreet1>
            <rptOwnerStreet2>1001 PENNSYLVANIA AVE. NW, SUITE 220S</rptOwnerStreet2>
            <rptOwnerCity>WASHINGTON</rptOwnerCity>
            <rptOwnerState>DC</rptOwnerState>
            <rptOwnerZipCode>20004</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, no par value per share</value>
            </securityTitle>
            <transactionDate>
                <value>2016-10-26</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5772376</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On October 26, 2016 (the &quot;Closing Date&quot;), pursuant to that Agreement and Plan of Merger, dated as of November 22, 2015 (the &quot;Merger Agreement&quot;), by and between Capital Bank Financial Corp. (&quot;Capital Bank&quot;) and CommunityOne Bancorp (&quot;COB&quot;), each share of common stock of COB issued and outstanding immediately prior to the Closing Date (other than Exception Shares (as defined in the Merger Agreement)) was converted into the right to receive, at the election of the holder but subject to proration, either (i) $14.25 in cash without interest, or (ii) 0.4300 shares of Class A Common Stock of Capital Bank (subject to the payment of cash in lieu of fractional shares). In accordance with the proration procedures set forth in the Merger Agreement, Carlyle Financial Services Harbor, L.P. received $23,775,053.67 in cash without interest and 1,764,699 shares of Class A Common Stock of Capital Bank for the shares of common stock of COB held by it on the Closing Date.</footnote>
        <footnote id="F2">Carlyle Financial Services Harbor, L.P. was the record holder of the shares reported herein. Carlyle Group Management L.L.C. is the general partner of The Carlyle Group L.P., which is a publicly traded entity listed on NASDAQ. The Carlyle Group L.P. is the managing member of Carlyle Holdings II GP L.L.C., which is the general partner of Carlyle Holdings II L.P., which is the general partner of TC Group Cayman Investment Holdings, L.P., which is the general partner of TC Group Cayman Investment Holdings Sub L.P., which is the sole shareholder of Carlyle Financial Services, Ltd., which is the general partner of TCG Financial Services, L.P., which is the general partner of Carlyle Financial Services Harbor, L.P. Each of such reporting persons expressly disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>CARLYLE GROUP MANAGEMENT L.L.C. By /s/ Daniel D'Aniello, Chairman</signatureName>
        <signatureDate>2016-10-28</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>THE CARLYLE GROUP, L.P. By: Carlyle Group Management L.L.C., its general partner By /s/ Daniel D'Aniello, Chairman</signatureName>
        <signatureDate>2016-10-28</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>CARLYLE HOLDINGS II GP L.L.C. By: The Carlyle Group L.P., its managing member By: Carlyle Group Management L.L.C., its general partner By /s/ Daniel D'Aniello, Chairman</signatureName>
        <signatureDate>2016-10-28</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>CARLYLE HOLDINGS II L.P. By /s/ Daniel D'Aniello, Chairman</signatureName>
        <signatureDate>2016-10-28</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>TC GROUP CAYMAN INVESTMENT HOLDINGS, L.P. By: Carlyle Holdings II L.P., its general partner By /s/ Daniel D'Aniello, Chairman</signatureName>
        <signatureDate>2016-10-28</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>TC GROUP CAYMAN INVESTMENT HOLDINGS SUB L.P. By: TC Group Cayman Investment Holdings, L.P., its general partner By: Carlyle Holdings II L.P., its general partner By /s/ Daniel D'Aniello, Chairman</signatureName>
        <signatureDate>2016-10-28</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>CARLYLE FINANCIAL SERVICES, LTD. By /s/ Ann Siebecker, Authorized Person</signatureName>
        <signatureDate>2016-10-28</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>TCG FINANCIAL SERVICES, L.P. By: Carlyle Financial Services, Ltd., its general partner By /s/ Ann Siebecker, Authorized Person</signatureName>
        <signatureDate>2016-10-28</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>CARLYLE FINANCIAL SERVICES HARBOR, L.P. By: TCG Financial Services, L.P., its general partner By: Carlyle Financial Services, Ltd., its general partner By /s/ Ann Siebecker, Authorized Person</signatureName>
        <signatureDate>2016-10-28</signatureDate>
    </ownerSignature>
</ownershipDocument>
