# P04EC on the 2021 Ram 2500

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

Nobody has written a description of this code yet.

## Bulletins for this model year that name P04EC

- [10229561](https://open.wenmarpro.com/bulletins/10229561), 2023-01-09: Updated Fuel Filler Cap This bulletin involves updating the fuel filler cap with improved version. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find that one or more of the following Diagnostic Trouble Codes \(DTCs\) have been set: P0455 \- EVAP System Large Leak. P0456 \- EVAP System Small Leak. P04EC \- EVAP System Large Leak Detected \- Fuel Tank Side. P04EE \- EVAP System Very Small Leak Detected \- Fuel Tank Side.
- [10225413](https://open.wenmarpro.com/bulletins/10225413), 2022-10-31: Updated Fuel Filler Cap This bulletin involves updating the fuel filler cap with improved version. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find that one or more of the following Diagnostic Trouble Codes \(DTCs\) have been set: P0455 \- EVAP System Large Leak. P0456 \- EVAP System Small Leak. P04EC \- EVAP System Large Leak Detected \- Fuel Tank Side. P04EE \- EVAP System Very Small Leak Detected \- Fuel Tank Side.
- [10225276](https://open.wenmarpro.com/bulletins/10225276), 2022-10-31: Updated Fuel Filler Cap This bulletin involves updating the fuel filler cap with improved version. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find that one or more of the following Diagnostic Trouble Codes \(DTCs\) have been set: P0455 \- EVAP System Large Leak. P0456 \- EVAP System Small Leak. P04EC \- EVAP System Large Leak Detected \- Fuel Tank Side. P04EE \- EVAP System Very Small Leak Detected \- Fuel Tank Side.