Diagnostic Trouble Code (DTC) Information CEM-De30

Condition 

Fig 1: Locating Electric Power Steering Module (EPS)

Courtesy of VOLVO CARS CORPORATION

The diagnostic trouble code (DTC) is stored if the central electronic module (CEM) registers that communication with the electric power steering module (EPS) is not operating.

The diagnostic trouble code (DTC) can be diagnosed when the ignition has been on for at least 10 seconds.

Substitute Value 

• None.

Possible Source 

• No power supply to the electrical power steering module (EPS)
• Open-circuit in the ground lead to the electric power steering module (EPS)
• Contact resistance in the terminals
• Open-circuit in the wiring for the CAN high speed network to the electric power steering module (EPS)
• The electric power steering module (EPS) is not intended for this car (for example a used control module with different software/hardware).

HINT: If several diagnostic trouble codes (DTCs) are stored in the central electronic module (CEM) for communication faults with other control modules in the high speed network, this indicates a common fault in the Control area network. 

Fault symptom[s] 

• The power steering system does not operate.