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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2015-05-19</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001615153</issuerCik>
        <issuerName>Fenix Parts, Inc.</issuerName>
        <issuerTradingSymbol>FENX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001641834</rptOwnerCik>
            <rptOwnerName>Gold David A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>ONE WESTBROOK CORPORATE CENTER,</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 920</rptOwnerStreet2>
            <rptOwnerCity>WESTCHESTER</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60154</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Executive Vice President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Exchangeable Preferred Shares of Fenix Parts Canada, Inc.</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0.00</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2015-05-19</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>555556</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2015-05-19</value>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>555556</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>555556</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Goldy Metals (Ottawa) Incorporated</value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">These shares consist of the stock portion of the consideration paid to Goldy Metals (Ottawa) Incorporated, one of the issuer's founding companies of which  the reporting person is a 100% owner, pursuant to the Amended and Restated Combination Agreement dated November 10, 2014 entered into by Fenix Parts, Inc., Fenix Parts Canada, Inc.,  David A. Gold, Kenneth L. Gold; and Goldy Metals Incorporated, an Ontario corporation; End of Life Vehicles Inc., an Ontario corporation; Goldy Metals (Ottawa) Incorporated, an Ontario corporation; and 2434861 Ontario Inc., an Ontario corporation. The Exchangeable Shares of Fenix Parts Canada, Inc. are convertible at any time into the same number of shares of the issuer's common stock.</footnote>
        <footnote id="F2">None</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Robin C. Friedman, Attorney-in-fact</signatureName>
        <signatureDate>2015-05-19</signatureDate>
    </ownerSignature>
</ownershipDocument>
