Diagnostic Trouble Code (DTC) Information

Condition 

Fig 1: Engine Control Module

Courtesy of VOLVO CARS CORPORATION

Diagnostic trouble code (DTC) ECM-531D is stored if the central electronic module (CEM) 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.