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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2021-04-30</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0001735707</issuerCik>
        <issuerName>Garrett Motion Inc.</issuerName>
        <issuerTradingSymbol>GTX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001166564</rptOwnerCik>
            <rptOwnerName>CYRUS CAPITAL PARTNERS, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>65 EAST 55TH STREET, 35TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001166774</rptOwnerCik>
            <rptOwnerName>CYRUS CAPITAL PARTNERS GP, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O  CYRUS CAPITAL PARTNERS, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>65TH EAST 55TH STREET, 35TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001251783</rptOwnerCik>
            <rptOwnerName>FREIDHEIM STEPHEN C</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CYRUS CAPITAL PARTNERS, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>65TH EAST 55TH STREET, 35TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</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</value>
            </securityTitle>
            <transactionDate>
                <value>2021-04-30</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>10220254</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </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="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On September 20, 2020, Garrett Motion Inc. (the &quot;Issuer&quot;) and certain of its subsidiaries (collectively, the &quot;Debtors&quot;) each filed a voluntary petition for relief under chapter 11 of title 11 of the United States Code (the &quot;Bankruptcy Code&quot;) in the United States Bankruptcy Court for the Southern District of New York (the &quot;Bankruptcy Court&quot;). On April 26, 2021, the Debtors filed an amended Chapter 11 plan of reorganization (the &quot;Plan&quot;) and on April 9, 2021, the Issuer filed a supplement to the Plan (as amended on April 20, 2021 and April 22, 2021, the &quot;Plan Supplement&quot;) with the Bankruptcy Court. On April 26, 2021, the Bankruptcy Court entered an order confirming the Plan (the &quot;Confirmation Order&quot;) and, on April 30, 2021 (the &quot;Effective Date&quot;) the conditions to effectiveness of the Plan were satisfied or waived and the Issuer emerged from bankruptcy.</footnote>
        <footnote id="F2">(Continued from footnote 1) On the Effective Date, all outstanding shares of the Issuer's common stock outstanding prior to the Effective Date were canceled, released, and extinguished, and of no further force or effect and without any need for a holder of such common stock to take further action with respect thereto. Accordingly, this Form 4 shall constitute an exit filing for the Reporting Persons with respect to the Issuer.</footnote>
        <footnote id="F3">These securities of the Issuer are beneficially owned by (i) Cyrus Capital Partners, L.P. (&quot;Cyrus Capital Partners&quot;), as a result of being the investment manager of certain private investment funds that directly hold common stock of the Issuer, including Cyrus 1740 Master Fund, L.P., Canary SC Master Fund, L.P., Cyrus Opportunities Master Fund II, Ltd., Crescent 1, L.P., CRS Master Fund, L.P., Cyrus Select Opportunities Master Fund, Ltd., Cyrus Select Opportunities Master Fund II, L.P., PC Investors III LLC, and Peterson Capital Investors LLC, (ii) Cyrus Capital Partners GP, L.L.C. (&quot;Cyrus Capital GP&quot;), as a result of being the sole general partner of Cyrus Capital Partners, and (iii) Stephen C. Freidheim, as a result of being the Chief Investment Officer of Cyrus Capital Partners and the sole member and manager of Cyrus Capital GP.</footnote>
    </footnotes>

    <remarks>The Reporting Persons are jointly filing this Form 4. The Reporting Persons disclaim beneficial ownership of any securities reported by any person except to the extent of their pecuniary interest therein.</remarks>

    <ownerSignature>
        <signatureName>STEPHEN C. FREIDHEIM, By: /s/ Stephen C. Freidheim</signatureName>
        <signatureDate>2021-05-03</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>CYRUS CAPITAL PARTNERS GP, L.L.C., By: /s/ Stephen C. Freidheim, Stephen C. Freidheim, its Sole Member/Manager</signatureName>
        <signatureDate>2021-05-03</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>CYRUS CAPITAL PARTNERS, L.P., By: Cyrus Capital Partners GP, L.L.C., its general partner, By: /s/ Stephen C. Freidheim, Stephen C. Freidheim, its Sole Member/Manager</signatureName>
        <signatureDate>2021-05-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
