Diagnostic trouble code (DTC) information

Condition 

Diagnostic trouble code (DTC) AEM-5F10 is stored if the control module registers that the signal is too low in the signal cable to the relay for the electrical engine block heater.

Diagnostic trouble codes (DTCs) can be diagnosed when the ignition is on and the relay for the electrical engine block heater is activated.

Substitute Value 

• The relay for the electrical engine block heater shuts down until the next time the ignition is switched on.

Possible Source 

• Short-circuit to ground in the signal cable to the relay for the electrical engine block heater
• Defective relay for the electrical engine block heater.

Fault symptom[s] 

• Poor heating in the passenger compartment.