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

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-10-21</periodOfReport>

    <issuer>
        <issuerCik>0000778164</issuerCik>
        <issuerName>Pacific Ethanol, Inc.</issuerName>
        <issuerTradingSymbol>PEIX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001321936</rptOwnerCik>
            <rptOwnerName>Jones William L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>400 CAPITOL MALL, #2060</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SACRAMENTO,</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>95814</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

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                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
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            </transactionDate>
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            </transactionCoding>
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                </transactionShares>
                <transactionPricePerShare>
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                </transactionAcquiredDisposedCode>
            </transactionAmounts>
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            </postTransactionAmounts>
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                <natureOfOwnership>
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                </natureOfOwnership>
            </ownershipNature>
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                </natureOfOwnership>
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                </transactionShares>
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        </nonDerivativeTransaction>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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                    <value>695864</value>
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                    <value>D</value>
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                </natureOfOwnership>
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                    <value>1000</value>
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                <transactionPricePerShare>
                    <value>.9347</value>
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                    <value>1700</value>
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                    <value>1100</value>
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                <sharesOwnedFollowingTransaction>
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                    <value>400</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>.9353</value>
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        <nonDerivativeTransaction>
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                <value>Common Stock</value>
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            <transactionDate>
                <value>2010-10-21</value>
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                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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                    <value>180</value>
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                <transactionPricePerShare>
                    <value>.9355</value>
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                    <value>D</value>
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                    <value>691484</value>
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                <directOrIndirectOwnership>
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                    <value></value>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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                <value>Common Stock</value>
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                <value>2010-10-21</value>
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                <transactionCode>S</transactionCode>
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                    <value>800</value>
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                <transactionPricePerShare>
                    <value>.9377</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                <sharesOwnedFollowingTransaction>
                    <value>690684</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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                    <value></value>
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        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
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            <transactionDate>
                <value>2010-10-21</value>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
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                <transactionShares>
                    <value>500</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>.9396</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                <sharesOwnedFollowingTransaction>
                    <value>690184</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-10-21</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
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                <transactionShares>
                    <value>1300</value>
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                <transactionPricePerShare>
                    <value>.9398</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>688884</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes></footnotes>

    <remarks>Part 3 of 4</remarks>

    <ownerSignature>
        <signatureName>/s/ William L. Jones</signatureName>
        <signatureDate>2010-10-22</signatureDate>
    </ownerSignature>
</ownershipDocument>
