Diagnostic Trouble Code (DTC) Information

Condition 

Fig 1: Identifying Engine Control Module (ECM)

Courtesy of VOLVO CARS CORPORATION

The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers an internal fault

The diagnostic trouble code can be diagnosed when the ignition is on.

Substitute Value 

• Various internal signals in the engine control module (ECM) are replaced with default values.

Possible Source 

• Poorly charged battery or corroded connecting wiring.
• Damaged software in the engine control module (ECM).
• Damaged engine control module (ECM).

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit