Diagnostic Trouble Code (DTC) Information EPS-0084

Condition 

Fig 1: Identifying Electric Power Steering Module (EPS)

Courtesy of VOLVO CARS OF NORTH AMERICA.

Engine control module (ECM) and Central electronic module (CEM) sends continuous information to Electrical power steering module (EPS) via the CAN-net. Electrical power steering module (EPS) uses the information to decide if the vehicle is in mode auto-stop. Electrical power steering module (EPS) checks communication with Engine control module (ECM) and Central electronic module (CEM).

The diagnostic trouble code (DTC) is stored if the control module detects that:

• Interrupted or missing communication with the Engine control module (ECM).
• Communication with the Central electronic module (CEM) is interrupted or missing.

The control module's test for the diagnostic trouble code (DTC) starts in the event of:

• Ignition switch position II.

Substitute Value 

• Power steering function, even if the vehicle is in mode auto-stop.

Possible Source 

• Fault trace the engine control module (ECM).
• Fault-trace the central electronic module (CEM).

Fault symptom[s] 

• Steering/Unusual noise/Unsure when/at all times