Diagnostic Trouble Code (DTC) Information CEM-6C42

Condition 

Fig 1: Identifying Ignition Switch

Courtesy of VOLVO CARS OF NORTH AMERICA.

The central electronic module (CEM) communicates with the ignition key when the key is inserted in the ignition switch.

The diagnostic trouble code (DTC) is stored if the central electronic module (CEM) registers an open-circuit in the cable for the clock signal to the ignition switch or a short-circuit to ground in the cable.

The diagnostic trouble code (DTC) can be diagnosed when the ignition is switched on.

Substitute Value 

• None.

Possible Source 

• Fault in the power supply (15) to the ignition switch
• Open-circuit in the cable for the clock signal
• Short-circuit to ground in the clock signal.

Fault symptom[s] 

• The starter motor does not turn.