DTC ECM-4308

Condition
The engine control module (ECM) checks the pressure in the fuel tank by measuring the current through the leak diagnostic pump.

Diagnostic trouble code (DTC) ECM-4308 is stored in the control module if the engine control module (ECM) registers that the pressure is not within certain limits and the engine control module (ECM) interprets this as the fuel tank filler cap missing.

Diagnostic trouble code (DTC) ECM-4308 can be diagnosed when the leak diagnostic is running.

Substitute value
- None.

Possible source

Fuel tank filler cap missing:
- Fuel tank filler cap not correctly installed.

Major leak:
- Leaking fuel tank, fuel filler pipe, fuel tank filler cap, EVAP canister, leak diagnostic pump, evaporative emission system (EVAP) valve, or in the hoses between these components
- Blocked evaporative emission system (EVAP) valve.

Minor leak:
- Leaking fuel tank, fuel filler pipe, fuel tank filler cap, EVAP canister, leak diagnostic pump, evaporative emission system (EVAP) valve, or in the hoses between these components
- Blocked evaporative emission system (EVAP) valve.

Fault symptom[s]
- None.