Diagnostic Trouble Code (DTC) Information CEM-8C21

Condition 

Fig 1: Identifying Tail Lamps

Courtesy of VOLVO CARS OF NORTH AMERICA.

The central electronic module (CEM) powers the rear fog lamp directly via an output. The diagnostic trouble code (DTC) is stored if the central electronic module (CEM) registers that the power consumption for the output is too high.

The diagnostic trouble code (DTC) can be diagnosed at key positions I and II.

Substitute Value 

• None.

Possible Source 

• Short-circuit to ground in the signal cable to the rear fog lamp.

Fault symptom[s] 

• The rear fog lamp does not work.