<PAGE>
                                                                  EXHIBIT 4(f)56

                             INTERCREDITOR AGREEMENT

         This Intercreditor Agreement (this "Agreement"), dated September __,
2003, is among Credit Acceptance Corporation ("CAC"), CAC Warehouse Funding
Corporation II ("Funding"), Credit Acceptance Funding LLC 2003-1, Credit
Acceptance Auto Dealer Loan Trust 2003-1 (the "2003-1 Trust"), Wachovia Capital
Markets, LLC, as deal agent and collateral agent under the Wachovia
Securitization Documents (as hereinafter defined) ("Wachovia"), JPMorgan Chase
Bank, as trustee under the 2003-1 Securitization Documents (as hereinafter
defined) (the "Trustee"), Comerica Bank, as agent under the CAC Credit Facility
Documents (as hereinafter defined) ("Comerica"), and each other creditor who
becomes a party hereto after the date hereof.

                                   BACKGROUND

         A. Pursuant to the terms of the various Dealer Agreements between CAC
and the Dealers, Collections from a particular Pool are first used to pay
certain collection costs, CAC's servicing fee and to pay back the Pool's Advance
balance. After the Advance balance under such Pool has been reduced to zero, the
Dealer to whom the Pool relates has a contractual right under the related Dealer
Agreement to receive a portion of any further Collections with respect to the
Pool (such portion of further Collections otherwise payable to the Dealer is
referred to herein as "Back-end Dealer Payments"), subject to CAC's right of
offset as described in paragraph F below.

         B. CAC has granted a security interest in CAC's rights with respect to
its Pools (to the extent not released) and related assets generally under the
CAC Credit Facility Documents to Comerica, as collateral agent for the banks
which are parties thereto.

         C. CAC and the Trustee have entered into a transaction as set forth in
the 2003-1 Securitization Documents (the "2003-1 Securitization") pursuant to
which the security interest with respect to certain specifically identified
Pools and related assets was released by Comerica (and will be released by
Comerica during the revolving period under the 2003-1 Securitization Documents),
CAC sold and contributed (and will contribute) such Pools and related assets to
its wholly-owned subsidiary, Credit Acceptance Funding LLC 2003-1, who
subsequently sold (and will sell) such Pools and related assets to the 2003-1
Trust, a trust the depositor of which is Credit Acceptance Funding LLC 2003-1,
and the 2003-1 Trust granted (and is granting) the Trustee a security interest
in its right, title and interest in and to such Pools and related assets (such
Pools and related assets are referred to herein as the "2003-1 Pools").

         D. CAC, Wachovia and certain other parties are entering into a
transaction as set forth in the Wachovia Securitization Documents (the "Wachovia
Securitization") pursuant to which the security interest with respect to certain
specifically identified Pools and related assets is being (and during the
revolving period under the Wachovia Securitization Documents will be) released
by Comerica, CAC is (and will be) contributing such Pools and related assets to
its wholly-owned subsidiary, Funding, and Funding is granting Wachovia, in its
capacity as collateral agent, a security interest in Funding's rights to such
Pools and related assets (such Pools and related assets are referred to herein
as the "Wachovia Pools").



                                       1.
<PAGE>

         E. Comerica retains a security interest in Pools and related assets
which has not been and will not be released, and has not been and will not be
granted to the Trustee, pursuant to the 2003-1 Securitization, and which
security interest will not be released pursuant to the Wachovia Securitization
(such unreleased Pools and related assets are referred to herein as the
"Comerica Pools").

         F. The Dealer Agreements permit CAC and its assignees, under certain
circumstances, to set off any Collections received with respect to any Pool of a
Dealer against Advances under other Pools of that Dealer and such set off rights
are authorized and permitted under the 2003-1 Securitization Documents and the
Wachovia Securitization Documents.

         G. The parties hereto acknowledge that the rights of CAC or its
assigns, pursuant to the Dealer Agreements, to set off Collections received with
respect to a Pool against the outstanding balance under any other Pool are not
intended, and should not be permitted, to be used to prejudice the collateral
position of any of the parties hereto, and therefore the exercise of such rights
should be limited to Back-end Dealer Payments.

         In consideration of the mutual premises and promises set forth herein
and other good and valuable consideration, the receipt and sufficiency of which
is hereby acknowledged, the parties agree as follows:

                                   AGREEMENTS

         1. Confirmation. Notwithstanding any statement or provision contained
in the Financing Documents or otherwise to the contrary, and irrespective of the
time, order or method of attachment or perfection of security interests granted
pursuant to the Financing Documents, respectively, or the time or order of
filing or recording of any financing statements, or other notices of security
interests, liens or other interests granted pursuant to the Financing Documents,
respectively, or the giving of or failure to give notice of the acquisition or
expected acquisition of purchase money or other security interests, and
irrespective of anything contained in any filing or agreement to which any
Creditor may now or hereafter be a party and irrespective of the ordinary rules
for determining priority under the Uniform Commercial Code or under any other
law governing the relative priorities of secured creditors, subject, however, to
the terms and conditions of this Agreement:

         (a) RELEASE BY THE TRUSTEE. The Trustee (i) releases any and all rights
in and to any Collections with respect to the Comerica Pools or the Wachovia
Pools or in any Back-end Dealer Payments; provided, that no release shall have
been granted with respect to amounts collected under any Pools which are
Back-end Dealer Payments that have been set off by CAC or by Comerica pursuant
to the CAC Credit Facility Documents against amounts owing under the 2003-1
Pools, and (ii) relinquishes all rights it has or may have to require CAC,
individually or as servicer, any successor servicer or Credit Acceptance Funding
LLC 2003-1 or Credit Acceptance Auto Dealer Loan Trust 2003-1 to use Collections
on its behalf contrary to clause (a)(i). The 2003-1 Trust agrees that the lien
and security interest granted to the Trustee pursuant to the 2003-1
Securitization Documents to which it is a party does not and shall not attach to
any Comerica Pools or Wachovia Pools (or related Collections) or to any Back-end
Dealer Payments and shall not assert any claim thereto.



                                       2.
<PAGE>

         (b) RELEASE BY WACHOVIA. Wachovia, as the collateral agent, (i)
releases any and all rights in and to any Collections with respect to the
Comerica Pools or the 2003-1 Pools or in any Back-end Dealer Payments; provided,
that no release shall have been granted with respect to amounts collected under
any Pools which are Back-end Dealer Payments that have been set off by CAC or by
Comerica pursuant to the CAC Credit Facility Documents against amounts owing
under the Wachovia Pools, and (ii) relinquishes all rights it has or may have to
require CAC, individually or as servicer, any successor servicer or Funding to
use Collections on its behalf contrary to clause (b)(i). Wachovia, as collateral
agent, agrees that the lien and security interest granted to it pursuant to the
Loan and Security Agreement does not and shall not attach to any Comerica Pools
or 2003-1 Pools (or related Collections) or to any Back-end Dealer Payments and
shall not assert any claim thereto.

         (c) RELEASE BY COMERICA. Comerica (i) releases any and all rights in
and to any Collections with respect to the Wachovia Pools and the 2003-1 Pools,
other than amounts collected under the Wachovia Pools or the 2003-1 Pools which
are owed to Dealers as Back-end Dealer Payments and which are subject to set off
by CAC pursuant to the related Dealer Agreement and which have not been set off
by CAC or by Comerica pursuant to the CAC Credit Facility Documents against
amounts owing under the Wachovia Pools or the 2003-1 Pools, and (ii)
relinquishes all rights it has or may have to require CAC, individually or as
servicer, or any successor servicer to use Collections on its behalf contrary to
clause (c)(i) above. Except for Back-end Dealer Payments to the extent provided
in clause (c)(i) above, Comerica agrees that the lien and security interest
granted to it pursuant to the CAC Credit Facility Documents does not and shall
not attach to any Wachovia Pools or 2003-1 Pools and shall not assert any claim
against the Wachovia Pools or the 2003-1 Pools or Collections related thereto.

         2. Covenant of the CAC Entities.


         (a) Each of the CAC Entities covenants that it shall not use any right
it may have under the Dealer Agreements, whether at the direction of Comerica,
Wachovia or the Trustee or otherwise, to set off any Collections, other than
amounts which are owed to Dealers as Back-end Dealer Payments, from one Pool
against amounts owed under another Pool encumbered in favor of another Creditor.

         (b) Each of the CAC Entities covenants that it will require any other
person or entity which hereafter acquires any security interest in the Pools,
Dealer Agreements and related assets from a CAC Entity to become parties to this
Agreement by executing an amendment or acknowledgment, in form and substance
reasonably satisfactory to CAC and the Creditors, by which such persons or
entities agree to be bound by the terms of this Agreement, and delivering such
signed amendment or acknowledgement hereof to each of the CAC Entities and the
Creditors; provided, however, that in the event the amount owed by the CAC
Entities to any Creditor shall be reduced to zero and such Creditor shall have
no obligation or agreement to make any further advances to any CAC Entity, such
Creditor shall have no rights under this Section 2(b).

         3. Turnover of Proceeds. The parties hereto agree that if, at any time,
a Creditor (a "Receiving Creditor") (x) receives any payment, distribution,
security or the proceeds thereof to which another Creditor or Creditors shall,
under the terms of Section 1 of this Agreement, be



                                       3.
<PAGE>

entitled and (y) the Receiving Creditor either (A) had actual knowledge, at the
time of such receipt, that such payment, distribution or proceeds were
wrongfully received by it or (B) another Creditor or Creditors shall have given
written notice to the Receiving Creditor, prior to such receipt, of its good
faith belief that such payments, distributions or proceeds are being misapplied,
and such notice contains evidence reasonably satisfactory to the Receiving
Creditor of such misapplication, then such Receiving Creditor shall receive and
hold the same separately and in trust for the benefit of, and shall forthwith
pay over and deliver the same to the relevant Creditor. For purposes of the
foregoing, the actual knowledge of the Trustee shall be determined based on the
actual knowledge of the Trustee's Responsible Officers (as defined in the
Indenture dated as of June 27, 2003 between the Trustee and the 2003-1 Trust),
it being understood that each such Responsible Officer shall have no duty to
make any inquiry regarding the propriety of any payment, distribution or
proceeds.

         4. Further Assurances. Each Creditor and CAC Entity agrees that it
shall be bound by all of the provisions of this Agreement. Without limiting any
other provision hereof, each of the Creditors and CAC Entities agrees that it
will promptly execute such instruments, notices or other documents as may be
reasonably requested in writing by any party hereto for the purpose of
confirming the provisions of this Agreement or better effectuating the intent
hereof. CAC will reimburse each Creditor for all reasonable expenses incurred by
such Creditor pursuant to this Section 4.

         5. Governing Law. This Agreement shall be governed by and construed in
accordance with the internal laws of the State of New York without regard to its
conflicts of laws rules. Each of the parties hereto agrees to the non-exclusive
jurisdiction of any federal court located within the State of New York. Each of
the Parties hereto hereby waives any objection based on forum non conveniens and
any objection to venue of any action instituted hereunder in any of the
aforementioned courts, and consents to the granting of such legal or equitable
relief as is deemed appropriate by such court.

         6. Counterparts. This Agreement may be executed in two or more
counterparts including facsimile transmission thereof (and by different parties
on separate counterparts), each of which shall be an original, but all of which
together shall constitute one of the same instrument.

         7. Severability. If any one or more of the covenants, agreements,
provisions or terms of this Agreement shall for any reason whatsoever be held
invalid, then such covenants, agreements, provisions, or terms shall be deemed
severable from the remaining covenants, agreements, provisions or terms of this
Agreement and shall in no way affect the validity or enforceability of the other
provisions of this Agreement.

         8. No Proceedings. Each of the parties hereto hereby agrees that it
will not institute against, or join any other person in instituting against
Funding, Credit Acceptance Funding LLC 2003-1 or Credit Acceptance Auto Dealer
Loan Trust 2003-1, any bankruptcy, reorganization, arrangement, insolvency or
liquidation proceedings, or other proceedings under any federal or state
bankruptcy or similar law so long as there shall not have elapsed one year and
one day after there are no remaining amounts owed to any of the Creditors by any
of the CAC Entities pursuant to the Wachovia Securitization Documents and the
2003-1 Securitization Documents.



                                       4.
<PAGE>

         9. Amendment. This Agreement and the rights and obligations of the
parties hereunder may not be changed orally, but only by an instrument in
writing executed by all of the parties hereto; provided further that if the
amount owed by the CAC Entities to any Creditor shall be reduced to zero and
such Creditor shall have no obligation or agreement to make any further advances
to any CAC Entity, this Agreement may be amended by the other parties hereto
without the consent of such Creditor.

         10. Capitalized Terms. Capitalized terms used but not otherwise defined
herein shall have the meaning set forth in Appendix A attached hereto and made
part of this Agreement.

         11. No Third Party Beneficiaries. This Agreement is not intended to
confer upon any person other than the parties hereto any rights or remedies
hereunder.

         12. Successors and Assigns. This Agreement shall be binding upon and
inure to the benefit of each of the parties hereto and their respective
successors and assigns, including any successor or assignor trustee under the
2003-1 Securitization Documents.

         13. Notices. Except as otherwise provided herein, all notices or demand
hereunder to the parties hereto shall be sufficient if made in writing, and
either: (i) sent via certified or registered mail (or the equivalent thereof),
postage prepaid, (ii) delivered by messenger or overnight courier, or (iii)
transmitted via facsimile with a confirmation of the receipt thereof. Notice
shall be deemed to be given for purposes of this Agreement on the day of
receipt. Unless otherwise specified in a notice sent or delivered in accordance
with the foregoing provisions of this Section, notices, demands and other
communications in writing shall be given to or made upon the respective parties
hereto: (a) in the case of any of the CAC Entities, to Silver Triangle Building,
25505 West Twelve Mile Road, Southfield, Michigan 48034-8339, Attention: James
D. Murray, Jr., telephone: (248) 353-2700 (ext. 884), facsimile: (248) 827-8542;
(b) in the case of Wachovia, to One Wachovia Center, 301 South College Street,
Charlotte, North Carolina 28288-0610, Attention: Conduit Administration,
telephone: (704) 383-9343, facsimile: (704) 383-9579; (c) in the case of the
Trustee, to its Corporate Trust Office, 4 New York Plaza, 6th Floor, New York,
NY 10004, Attention: Institutional Trust Services/Structured Finance, telephone:
(212) 623-5600, facsimile: (212) 623-5932; and (d) in the case of Comerica, to
One Detroit Center, 6th Floor, 500 Woodward Avenue, Detroit, Michigan 48226,
Attention: Scott Dorn, telephone: (313) 222-5868, facsimile: (313) 222-7475.

         14. Termination. Each party's rights and obligations under this
agreement shall terminate at the time all amounts due to or owed by such party
have been paid in full and such party's applicable Financing Documents have been
terminated so long as each party whose rights and obligations are subject to
termination pursuant to this Section 14 (i) has no actual knowledge or written
notice of payments, distributions, security or the proceeds thereof to which
another Creditor or Creditors is entitled, as provided in Section 3 hereof, and
(ii) has not received a written notice from the Agent under the CAC Credit
Facility Documents that there is a Default or an Event of Default (as such terms
are defined therein) at the time of the termination of the applicable Financing
Documents.

         15. Termination of Prior Agreement. This Agreement is intended to
supersede the Prior Agreement in its entirety. Each of Comerica, Wachovia and
the CAC Entities that were



                                       5.
<PAGE>

parties to the Prior Agreement further acknowledge and agree that, as among
themselves, this Agreement supersedes the Prior Agreement with respect to their
rights as against each other and that this Agreement shall govern their rights
against each other and the other parties hereto.

                            [signature page follows]




                                       6.
<PAGE>

         This Intercreditor Agreement has been executed and delivered by the
parties hereto on _____________, 2003.


CREDIT ACCEPTANCE CORPORATION               WACHOVIA CAPITAL MARKETS, LLC,
                                            AS AGENT



/s/ Douglas W. Busk                         /s/ Prakash B. Wadhwani
--------------------------------            --------------------------------
BY: Douglas W. Busk                         BY: Prakash B. Wadhwani
TITLE: Treasurer and Chief                  TITLE: Vice President
       Financial Officer

JPMORGAN CHASE BANK, NOT IN ITS             COMERICA BANK, AS AGENT
INDIVIDUAL CAPACITY BUT SOLELY AS
TRUSTEE



/s/ Daniel C. Brown, Jr.                    /s/ Scott Dorn
--------------------------------            --------------------------------
BY: Daniel C. Brown, Jr.                    BY: Scott Dorn
TITLE: Vice President                       TITLE: AVP


CAC WAREHOUSE FUNDING CORPORATION II        CREDIT ACCEPTANCE FUNDING LLC 2003-1



/s/ Douglas W. Busk                         /s/ Douglas W. Busk
--------------------------------            --------------------------------
BY: Douglas W. Busk                         BY: Douglas W. Busk
TITLE: Vice President -                     TITLE: V.P. - Finance & Treasurer
       Finance & Treasurer


CREDIT ACCEPTANCE AUTO DEALER
LOAN TRUST 2003-1

BY: WACHOVIA BANK OF DELAWARE,
NATIONAL ASSOCIATION, NOT IN ITS
INDIVIDUAL CAPACITY BUT SOLELY AS
OWNER TRUSTEE



/s/ Sterling C. Correia
--------------------------------
BY: Sterling C. Correia
TITLE: Vice President



                   [Signature Page to Intercreditor Agreement]



                                       7.
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                                   APPENDIX A

                                   DEFINITIONS

         2003-1 Securitization Documents: The Sale and Serving Agreement dated
as of June 27, 2003 among Credit Acceptance Auto Dealer Loan Trust 2003-1,
Credit Acceptance Funding LLC 2003-1, CAC, the Trustee, and Systems & Services
Technologies, Inc., the Indenture dated as of June 27, 2003 between the Trustee
and the 2003-1 Trust, and the documents related thereto.

         Advance: Amounts advanced to a Dealer upon the acceptance of a Contract
by CAC pursuant to a Dealer Agreement.

         CAC Credit Facility Documents: The Second Amended and Restated Credit
Acceptance Corporation Credit Agreement, dated as of June 9, 2003, as amended,
by and among the Banks signatory thereto, Comerica Bank, CAC, Credit Acceptance
Corporation UK Limited, CAC of Canada Limited and Credit Acceptance Corporation
Ireland Limited and the documents related thereto.

         CAC Entities: Each of CAC, CAC Warehouse Funding Corporation II, Credit
Acceptance Funding LLC 2003-1 and Credit Acceptance Auto Dealer Loan Trust
2003-1.

         Collections: All money, amounts or other payments received or collected
by CAC, individually or as servicer, or any successor servicer or any other CAC
Entity with respect to a Contract in the form of cash, checks, wire transfers or
other form of payment in accordance with the Contracts or the Dealer Agreements,
including, without limitation, with respect to a Pool amounts collected under
any other Pool which are Back-end Dealer Payments that have been set off by CAC
or by Comerica pursuant to the CAC Credit Facility Documents, against amounts
owing under such Pool.

         Contract: A retail installment contract for the sale of new or used
motor vehicles assigned outright by Dealers to CAC or a subsidiary of CAC or
written by Dealers in the name of CAC or a subsidiary of CAC (and funded by CAC
or such subsidiary) or assigned by Dealers to CAC or a subsidiary of CAC, as
nominee for the Dealer, for administration, servicing, and Collection, in each
case pursuant to an applicable Dealer Agreement.

         Creditor:  Each of Comerica, Wachovia and the Trustee.

         Dealer: A person engaged in the business of the retail sale or lease of
new or used motor vehicles, including both businesses exclusively selling used
motor vehicles and businesses principally selling new motor vehicles, but having
a used vehicle department, including any such person which constitutes an
affiliate of CAC.

         Dealer Agreement: The sales and/or servicing agreements between CAC or
its subsidiaries and a participating Dealer which sets forth the terms and
conditions under which CAC or its subsidiaries (i) accepts, as nominee for such
Dealer, the assignment of Contracts for purposes of administration, servicing
and collection and under which CAC


                                       8.
<PAGE>
or its subsidiary may make Advances to such Dealers and (ii) accepts outright
assignments of Contracts from Dealers or funds Contracts originated by such
Dealer in the name of CAC or any of its subsidiaries, in each case as such
agreements may be in effect from time to time.

         Financing Documents: The CAC Credit Facility Documents, the Wachovia
Securitization Documents and the 2003-1 Securitization Documents.

         Pool: A grouping on the books and records of CAC or any of its
subsidiaries of Advances, Contracts originated or to be originated with CAC or
any of its subsidiaries by a Dealer and bearing the same pool identification
number assigned by CAC's computer system.

         Prior Agreement: The Intercreditor Agreement dated June 27, 2003 among
CAC, CAC Warehouse Funding Corp., Credit Acceptance Funding LLC 2003-1, Credit
Acceptance Auto Dealer Loan Trust 2003-1, Wachovia, the Trustee and Comerica.

         Wachovia Securitization Documents: The Loan and Security Agreement
dated as of September ___, 2003 among CAC Warehouse Funding Corporation II, CAC,
Wachovia Bank, National Association, Variable Funding Capital Corporation,
Wachovia Capital Markets, LLC as collateral agent and deal agent, and Systems &
Services Technologies, Inc. and the other parties from time to time party
thereto, and the documents related thereto.




                                       9.