<?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>0001674541</rptOwnerCik>
            <rptOwnerName>Centerbridge Special Credit Partners III-Flex, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>375 PARK AVENUE, 11TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10152</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001584544</rptOwnerCik>
            <rptOwnerName>Centerbridge Credit Partners Master, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>375 PARK AVENUE, 11TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10152</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001484834</rptOwnerCik>
            <rptOwnerName>Centerbridge Credit Partners Offshore General Partner, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>375 PARK AVENUE, 11TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10152</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001667800</rptOwnerCik>
            <rptOwnerName>Centerbridge Credit Cayman GP, Ltd.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>375 PARK AVENUE, 11TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10152</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001584682</rptOwnerCik>
            <rptOwnerName>Centerbridge Credit GP Investors, L.L.C.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>375 PARK AVENUE, 11TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10152</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001827884</rptOwnerCik>
            <rptOwnerName>Centerbridge Special Credit Partners General Partner III, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>375 PARK AVENUE, 11TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10152</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001667801</rptOwnerCik>
            <rptOwnerName>CCP III Cayman GP Ltd.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>375 PARK AVENUE, 11TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10152</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001425800</rptOwnerCik>
            <rptOwnerName>Aronson Jeffrey</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>375 PARK AVENUE, 11TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>11</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"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>3390000</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On April 30, 2021, Garrett Motion Inc.'s (the &quot;Company&quot;) plan of reorganization became effective which automatically terminated the Second Amended and Restated Plan Support Agreement. Upon the effective date of the plan of reorganization, all then outstanding shares of Common Stock were cancelled.  As a result, on April 30, 2021, each of the Reporting Persons listed herein ceased to be the beneficial owner of any shares of Common Stock, and instead acquired beneficial ownership of newly issued securities in the reorganized Company. These newly acquired interests in the Company shall be reported on a subsequent Form 3 filing.</footnote>
        <footnote id="F2">CSCP III Cayman GP Ltd. (&quot;CSCP III Cayman GP&quot;) is the general partner of Centerbridge Special Credit Partners General Partner III, L.P. (&quot;Special Credit III GP&quot;), which is the general partner of Centerbridge Special Credit Partners III-Flex, L.P. (&quot;SC III-Flex&quot;), and may be deemed to share beneficial ownership over the shares held of record by SC III-Flex. As the director of CSCP III Cayman GP, Jeffrey H. Aronson may be deemed to share beneficial ownership with respect to the shares held of record by SC III-Flex. Such persons and entities expressly disclaim beneficial ownership of the shares held of record by SC III-Flex, except to the extent of any proportionate pecuniary interest therein. Centerbridge Credit GP Investors, L.L.C. (&quot;Credit GP Investors&quot;) is the sole director of Centerbridge Credit Cayman GP, Ltd. (&quot;Credit Cayman GP&quot;), which is the general partner of Centerbridge Credit Partners Offshore General Partner, L.P.</footnote>
        <footnote id="F3">(Continued from Footnote 2) (&quot;Credit Partners Offshore GP&quot;), which is the general partner of Centerbridge Credit Partners Master, L.P. (&quot;Credit Partners Master&quot;), and may be deemed to share beneficial ownership over the shares held of record by Credit Partners Master.  As the managing member of Credit GP Investors, Jeffrey H. Aronson may be deemed to share beneficial ownership with respect to the shares held of record by Credit Partners Master.  Such persons and entities expressly disclaim beneficial ownership of the shares held of record by Credit Partners Master, except to the extent of any proportionate pecuniary interest therein</footnote>
    </footnotes>

    <remarks>The Reporting Persons are jointly filing this Form 4. Pursuant to Rule 16a-1(a)(4) under the Securities Exchange Act of 1934, as amended, each of the Reporting Persons (other than to the extent it directly holds securities reported herein) states that the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of any or all of the reported securities for purposes of Section 16 or for any other purpose. We note that the undersigned have made a Schedule 13D filing, and we refer to the disclosures contained therein regarding potential &quot;group&quot; status and disclaimers thereto.</remarks>

    <ownerSignature>
        <signatureName>CENTERBRIDGE CREDIT PARTNERS MASTER, L.P., By: Centerbridge Credit GP Investors, Its Indirect Dir., /s/ Susanne V. Clark, Authorized Signatory</signatureName>
        <signatureDate>2021-05-04</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>CENTERBRIDGE CREDIT PARTNERS OFFSHORE GENERAL PARTNER, L.P., By: Centerbridge Credit Cayman GP, Ltd., Its GP, By: Centerbridge Credit GP Investors L.L.C., Its director, /s/ Susanne V. Clark, Name: Susanne V. Clark, Title: Authorized Signatory</signatureName>
        <signatureDate>2021-05-04</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>CENTERBRIDGE CREDIT CAYMAN GP, LTD., By: Centerbridge Credit GP Investors, L.L.C., its director, /s/ Susanne V. Clark, Name: Susanne V. Clark, Title: Authorized Signatory</signatureName>
        <signatureDate>2021-05-04</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>CENTERBRIDGE CREDIT GP INVESTORS, L.L.C., /s/ Susanne V. Clark, Name: Susanne V. Clark, Title: Authorized Signatory</signatureName>
        <signatureDate>2021-05-04</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>CENTERBRIDGE SPECIAL CREDIT PARTNERS III-FLEX, L.P., By: Centerbridge Special Credit Partners General Partner III, L.P., Its GP, By: CSCP III Cayman GP Ltd., Its GP, /s/ Susanne V. Clark, Name: Susanne V. Clark, Title: Authorized Signatory</signatureName>
        <signatureDate>2021-05-04</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>CENTERBRIDGE SPECIAL CREDIT PARTNERS GENERAL PARTNER III, L.P., By: CSCP III Cayman GP Ltd., its general partner, /s/ Susanne V. Clark, Name: Susanne V. Clark, Title: Authorized Signatory</signatureName>
        <signatureDate>2021-05-04</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>CSCP III CAYMAN GP LTD., /s/ Susanne V. Clark, Name: Susanne V. Clark, Title: Authorized Signatory</signatureName>
        <signatureDate>2021-05-04</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>JEFFREY H. ARONSON, /s/ Jeffrey H. Aronson</signatureName>
        <signatureDate>2021-05-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
