EXHIBIT 23(a)


            CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


We have issued our reports dated March 10, 2006, accompanying the consolidated
financial statements and management's assessment of the effectiveness
of internal control over financial reporting included in the Annual Report of
Credit Acceptance Corporation and Subsidiaries on Form 10-K for the year ended
December 31, 2005. We hereby consent to the incorporation by reference of said
reports in the Registration Statement of Credit Acceptance Corporation in this
Registration Statement on Forms S-3 (File Nos. 33-75246 (as amended) and
333-18301) and Forms S-8 (File Nos. 33-64876, 33-80339, 333-67348, 333-91734,
333-111831, and 333-120756).


/s/ Grant Thornton LLP


Southfield, Michigan
March 10, 2006