Diagnostic Trouble Code (DTC) Information CEM-6C49

Condition

Fig 1: Identifying Ignition Switch

Courtesy of VOLVO CARS OF NORTH AMERICA.

With the ignition on the central electronic module (CEM) reads the transponder signal. The diagnostic trouble code (DTC) is stored if the transponder responds with a correct code (the key belongs to the vehicle) but something else failed during communication.

NOTE:

This diagnostic trouble code (DTC) may be stored for example if there are several ignition keys on the same key ring and one of them is inserted in the ignition switch.

Substitute Value

None.

Possible Source

Several keys are too close to each other during the read off
An electronic door key was too close to the antenna unit during the read off
An automatic road toll transponder is installed too close to the antenna unit
EMC interference (strong electrical field) during the communication phase (when starting the engine)
The ignition key belongs to another Volvo of the same type, i. e. it has a different transponder code.

Fault symptom[s]

The starter motor does not turn.