# P300C on the 2025 Mercedes\-Benz Sprinter

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.

This code is specific to a manufacturer and is not described here.

## Bulletins for this model year that name P300C

- [11028117](https://open.wenmarpro.com/bulletins/11028117), 2026-02-03: Complaint Check engine warning light is active. The following fault codes may be present in the engine control unit: • P3007F1 Leak detected in the intake air system or • P3007F2 Mass air flow malfunction in the intake air system \(cylinder bank 1\) or • P300CA8 Leak detected in the intake air system or • P300CA9 Mass air flow malfunction in the intake air system \(cylinder bank 1\) or • P300CA9 and P3007F1: Faults are present simultaneously in the quick test In addition, the customer may report: • An “air leak” type noise from the engine compartment/intake air area, and/or • A “chugging” noise, especially during acceleration or under load. These noise complaints can be present with or without the above fault codes. Cause Causes for FC P3007F1 or P300CA8: Faults are set if: • If there is a leakage upstream of the exhaust gas turbocharger \(see "Dichtring\_Sealant.jpg"\). • If the housing intermediate flange at the high\-pressure EGR valve \(where the exhaust back pressure sensor connects\) is carbonized or clogged, or if there is carbonization/incomplete sealing of the high\-pressure or lowpressure EGR valves. \(See “Gehaeusezwischenflansch\_intermediate\_flange.jpg” and verstopfter\_Gehaeusezwischenflansch\_clogged\_Intermediate\_Flange.jpg.”\) • Note: Only relevant if the correction value in load range 1 is less than \-8%. • If the intake manifold \(charge air distribution line\) or charge air cooler is carbonized \(see "Saugrohr\_intake\_manifold.jpg"\). • If engine timing is misadjusted. • There is a defective hot film mass air flow sensor or a hot film mass air flow sensor that is affected by incorrect airflow \(this can be due to a clogged or deformed air filter\). Refer to the attached file "Luftfilter\_air\_filter." Cause of fault code combination P300CA9 AND P3007F1: Faults are set if: • There is carbonization or incomplete closure of the high\-pressure exhaust gas recirculation valve, especially in the housing intermediate flange at the EGR valve \(linked to the exhaust back pressure sensor\). Charleston Plant Identification – VIN 11th Digit “T”: For vehicles produced at the Charleston Plant \(identified by “T” in the 11th digit of the VIN\) with a production date on or after 12/20/2023: • If fault code P3007F1 or P300CA8 is set, an air leak is found, and the cause is identified as a loose or mis\-installed Clean Air Line from the factory, open an Initial Field Quality \(Info Only\) case. • Include the current Quick Test and photos showing the Clean Air Line issue. For all other vehicles, continue diagnosis as per the standard instructions.