Diagnostic trouble code (DTC) information ECM-3020

Condition 

Fig 1: Engine Control Module

Courtesy of VOLVO CARS OF NORTH AMERICA.

The diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects a fault in the control module internal circuit for knock control.

The diagnostic trouble code (DTC) can be diagnosed when the ignition is switched on.

Substitute Value 

• Safety retardation of ignition advance
• Reduced boost pressure.

Possible Source 

• Damaged engine control module (ECM).

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit
• Poor performance.