Diagnostic trouble code (DTC) information ECM-443B

Condition 

Fig 1: Identifying Fuel Level Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

The central electronic module (CEM) transmits information about the fuel level and the fault status of the fuel level sensor to the engine control module (ECM).

The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers a communication problem with the central electronic module (CEM).

Substitute Value 

None.

Possible Source 

• Open-circuit in the control area network (CAN) wiring
• Short-circuit between the control area network (CAN) wiring
• Internal fault in another control module in the same part of the control area network (CAN).

Fault symptom[s] 

• Gauges/Fuel level not accurate/Value too low