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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2016-02-01</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>2016-02-01</value>
                <footnoteId id="F1"/>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>167500</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>6.1113</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>11264846</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2016-02-02</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>32500</value>
                    <footnoteId id="F5"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>6.058</value>
                    <footnoteId id="F5"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>11232346</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1633347</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>USAA Property Holdings, Inc.</value>
                    <footnoteId id="F6"/>
                </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, and #$4)

PRICE     SOLD SHARES
$6.00  	    3,600
$6.01 	    2,800
$6.015 	      200
$6.02 	      800
$6.025 	      100
$6.03 	      776
$6.035 	    1,300
$6.04 	    2,747
$6.045 	      800
$6.05 	    3,900
$6.055 	      300
$6.06 	    5,900
$6.065 	    1,120
$6.07 	    5,563
$6.075 	    3,800
$6.08 	    9,523
$6.085 	    7,300
$6.09 	   16,736
$6.095 	   11,000
$6.10 	    8,314</footnote>
        <footnote id="F3">Execution Breakdown of Price/Sold Shares: (continuation from footnote #2)

PRICE    SOLD SHARES
$6.105      4,535
$6.11 	   12,005
$6.115 	    5,726
$6.12 	   12,169
$6.125      1,200
$6.13       8,748
$6.1323       200
$6.135 	      100
$6.14 	    1,800
$6.145 	      500
$6.15 	    2,700
$6.155 	      900
$6.16 	    2,800
$6.165 	    1,700
$6.17 	    3,500
$6.175        800
$6.18       2,921
$6.185 	    1,100
$6.19 	    3,320</footnote>
        <footnote id="F4">Execution Breakdown of Price/Sold Shares: (continuation from footnote #3)

PRICE    SOLD SHARES
$6.20      2,905
$6.205       400
$6.21      2,280
$6.215     1,300
$6.22      1,292
$6.225 	     100
$6.23      2,400
$6.24        500
$6.25        200
$6.26        620
$6.265       200
$6.27        200
$6.35      1,600
$6.405       100
$6.41        100</footnote>
        <footnote id="F5">Execution Breakdown of Price/Sold Shares:

PRICE    SOLD SHARES
$ 6.00 	   10,224
$6.01 	    6,196
$6.02 	    1,080
$6.025 	      200
$6.03 	      100
$6.08 	      100
$6.09 	      100
$6.10 	    6,370
$6.11 	      200
$6.12 	    3,300
$6.13 	      300
$6.14 	      600
$6.15 	    2,800
$6.18 	      530
$6.19 	      200
$6.225 	      200</footnote>
        <footnote id="F6">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>2016-02-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
