Diagnostic Trouble Code (DTC) Information ECM-9990

Condition 

Fig 1: Engine Control Module

Courtesy of VOLVO CARS CORPORATION

The engine control module (ECM) continuously checks its own internal reset functionality. The diagnostic trouble code (DTC) is stored if there is a fault in the reset function.

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.