Diagnostic trouble code (DTC) information CEM-1A62

Condition 

Fig 1: Identifying Engine Control Module

Courtesy of VOLVO CARS OF NORTH AMERICA.

Diagnostic trouble codes (DTCs) are stored if the central electronic module (CEM) registers that communication with the engine control module (ECM) is not operating.

Substitute Value 

None.

Possible Source 

• No power supply to the engine control module (ECM)
• Open-circuit in the ground lead to the engine control module (ECM)
• Contact resistance in the terminals
• Open-circuit in the wiring for the CAN high speed network to the engine control module (ECM)
• - The engine control module (ECM) is not intended for this car (for example a used control module with different software/hardware).

HINT: If several diagnostic trouble codes (DTCs) are stored in the central electronic module (CEM) for communication faults with other control modules in the high speed network, this indicates a common fault in the Control area network, see the wiring diagram. 

Fault symptom[s] 

• The starter motor turns but the engine does not start
• The engine cuts out
• Engine feels sluggish
• Malfunction indicator lamp (MIL) lit
• Message in the display.