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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2016-01-04</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001327318</issuerCik>
        <issuerName>TrueCar, Inc.</issuerName>
        <issuerTradingSymbol>TRUE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001021249</rptOwnerCik>
            <rptOwnerName>UNITED SERVICES AUTOMOBILE ASSOCIATION</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>9800 FREDERICKSBURG RD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SAN ANTONIO</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>78288</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001607293</rptOwnerCik>
            <rptOwnerName>USAA Property Holdings, Inc.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>9800 FREDERICKSBURG ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SAN ANTONIO</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>78288</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>2016-01-04</value>
                <footnoteId id="F1"/>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>200000</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                    <footnoteId id="F6"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>8.785</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                    <footnoteId id="F6"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>11432346</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1633347</value>
                    <footnoteId id="F7"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>USAA Property Holdings, Inc.</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The transactions reported on this form were executed pursuant to a 10b5-1 plan adopted as of August 26, 2015.</footnote>
        <footnote id="F2">Execution Breakdown of Price/Sold Shares:  (continuation will be included in footnote #3, #4, #5 and #6)

$8.32 	 300
$8.34 	 400
$8.345 	 100
$8.36 	 300
$8.37 	 600
$8.38 	 200
$8.39 	 300
$8.40 	 2,800
$8.405 	 200
$8.41 	 1,000
$8.415 	 300
$8.42 	 1,300
$8.425 	 1,500
$8.43 	 2,298
$8.435 	 2
$8.44 	 3,643
$8.445 	 1,683
$8.45 	 2,500
$8.46 	 500
$8.47 	 1,147
$8.475 	 353
$8.48 	 600</footnote>
        <footnote id="F3">Execution Breakdown of Price/Sold Shares: (continuation from footnote # 2)

$8.50 	 14,075
$8.505 	 400
$8.51 	 6,037
$8.515 	 200
$8.52 	 5,510
$8.525 	 300
$8.53 	 1,700
$8.54 	 1,175
$8.55 	 2,800
$8.555 	 600
$8.56 	 2,400
$8.57 	 1,772
$8.58 	 5,300
$8.585 	 100
$8.59 	 2,700
$8.60 	 2,200
$8.61 	 1,477
$8.615 	 200
$8.62 	 1,259
$8.63 	 824
$8.635 	 1,300
$8.64 	 900
$8.65 	 1,780
$8.66 	 1,000
$8.67 	 725</footnote>
        <footnote id="F4">Execution Breakdown of Price/Sold Shares: (continuation from footnote #3)

$8.675 	 675
$8.68 	 1,600
$8.685 	 100
$8.71 	 293
$8.72 	 300
$8.73 	 480
$8.735 	 400
$8.74 	 1,100
$8.745 	 300
$8.75 	 700
$8.76 	 1,300
$8.765 	 600
$8.77 	 900
$8.771 	 100
$8.78 	 1,400
$8.785 	 200
$8.79 	 800
$8.80 	 2,924
$8.81 	 2,200
$8.815 	 1,400
$8.82 	 3,100
$8.825 	 1,400
$8.83 	 820
$8.84 	 4,645
$8.85 	 1,000</footnote>
        <footnote id="F5">Execution Breakdown of Price/Sold Shares: (continuation from footnote #4)

$8.855 	 600
$8.86 	 1,790
$8.87 	 1,625
$8.88 	 1,900
$8.89 	 1,900
$8.895 	 200
$8.90 	 700
$8.905 	 700
$8.91 	 2,600
$8.92 	 2,400
$8.93 	 800
$8.94 	 5,429
$8.945 	 100
$8.95 	 4,085
$8.96 	 4,459
$8.965 	 2,200
$8.97 	 4,113
$8.975 	 1,300
$8.98 	 3,100
$8.985 	 1,899
$8.99 	 2,900
$9.00 	 5,721
$9.005 	 600
$9.01 	 3,700</footnote>
        <footnote id="F6">Execution Breakdown of Price/Sold Shares: (continuation from footnote #5)

$9.02 	 1,800
$9.025 	 200
$9.03 	 1,300
$9.04 	 1,000
$9.045 	 100
$9.05 	 1,250
$9.06 	 1,795
$9.065 	 435
$9.07 	 1,200
$9.08 	 3,800
$9.085 	 2,200
$9.09 	 2,600
$9.10 	 1,799
$9.105 	 1,000
$9.11 	 2,210
$9.12 	 3,386
$9.125 	 3,607
$9.13 	 4,600
$9.14 	 400
$9.15 	 100
$9.16 	 1,000
$9.17 	 500
$9.18 	 200
$9.19 	 100
$9.21 	 100
$9.22 	 200
$9.23 	 800</footnote>
        <footnote id="F7">USAA Property Holdings, Inc. is a wholly owned subsidiary of United Services Automobile Association.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Douglas I. Ward, Vice President and Chief Investment Officer</signatureName>
        <signatureDate>2016-01-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
