Diagnostic trouble code (DTC) information ECM-406C

Condition 

If the engine control module (ECM) registers that fuel filling has been carried out through the fuel level being changed, the position and installation of the fuel tank filler cap is checked. This is carried out by quicker leak diagnostics.

The check is carried out a few minutes after start if the vehicle speed is constant and exceeds 30 km/h and only if no fault is detected on the leak diagnostic unit.

The diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects a leak after filling. This is interpreted as fuel tank filler cap missing or loosely installed.

Substitute Value 

None.

Possible Source 

• The fuel tank filler cap is missing or not properly tightened.

Fault symptom[s] 

• None.