Diagnostic trouble code (DTC) information

Condition 

Fig 1: Identifying Engine Control Module

Courtesy of VOLVO CARS OF NORTH AMERICA.

Diagnostic trouble code (DTC) ECM-531D is stored if the central electronic module (CEM) (driver information module for the C70) detects a fault in the engine control module (ECM) software (incorrect check sum).

Substitute Value 

none

Possible Source 

• fault in engine control module (ECM)
• changed software in engine control module (ECM)
• defective engine control module (ECM).

Fault symptom[s] 

• varies depending on the type of fault.