Diagnostic trouble code (DTC) information

Condition

Fig 1: 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.