Home >> Volvo >> 2007 >> XC70 >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control Module (ECM) Diagnostic Trouble Codes (XC) - 6 Of 9 >> ECM-640D: Turbocharger (TC) Control System. Signal Too Low (B5254T2; 2005-2007) >> Signal too high / Signal too low