Diagnostic Trouble Code (DTC) Information ECM-983C

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 a fault indicating that the internal monitoring functions have registered one or more present values that do not correspond with the complement value.

The diagnostic trouble code (DTC) is diagnosed at ignition on or with the engine running.

Substitute Value 

• Engine speed (RPM) and torque are limited to a calculated normal operating range.

Possible Source 

• Damaged engine control module (ECM).

Fault symptom[s] 

• Maximum engine speed (RPM) too low
• Cruise control does not work at all
• Uneven idle
• Malfunction indicator lamp (MIL) lit.