Diagnostic Trouble Code (DTC) Information CEM-6C46

Condition 

Fig 1: Identifying Ignition Switch

Courtesy of VOLVO CARS OF NORTH AMERICA.

When the ignition is switched on, the central electronic module (CEM) attempts to read the identity number of the transponder in the ignition key. The central electronic module (CEM) tests the antenna unit before this. The diagnostic trouble code (DTC) is stored if the central electronic module (CEM) registers an internal fault in the antenna unit.

HINT: The diagnostic trouble code (DTC) may also be stored in the event of temporary interference in the communication with the antenna unit. 

Substitute Value 

• None.

Possible Source 

• Temporary interference in the communication with the immobilizer antenna unit (IAU)
• Internal fault in the immobilizer antenna unit (IAU).

Fault symptom[s] 

• The starter motor does not turn.