Diagnostic trouble code (DTC) information

Condition 

Fig 1: Identifying Engine Control Module

Courtesy of VOLVO CARS OF NORTH AMERICA.

The engine control module (ECM) continuously checks the internal RAM (random access memory) functionality. The diagnostic trouble code (DTC) is stored if there is a fault in the RAM.

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

Substitute Value 

• The engine control module (ECM) attempts to reset itself.

Possible Source 

• Faulty software in the engine control module (ECM)
• Damaged engine control module (ECM).

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit
• The malfunction indicator lamp (MIL) flashes
• The engine cuts out
• The starter motor turns but the engine does not start.