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Home >> Volvo >> 2009 >> V70 >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Electrical Components - Design And Function) >> Transmission Control Module (TCM) (4T65 AWD; 2003-2006) >> TCM Diagnostic Functions >> Diagnostic Trouble Codes
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Diagnostic Trouble Codes

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If the control unit detects a fault, it stores a diagnostic trouble code. If, for any reason, a fault disappears after the diagnostic trouble code has been permanently stored in the control unit, information about the trouble code still remains in the control unit.

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