Diagnostic trouble code (DTC) information ECM-4420

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 engine control module (ECM) compares the engine fuel consumption with the change in fuel level over a set period of time. The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers an implausibly small reduction in the fuel level compared with calculated fuel consumption.

Substitute Value 

None.

Possible Source 

• Fault-trace the central electronic module (CEM).

Fault symptom[s] 

• Gauges/Fuel level not accurate/Value too low