What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P30040BComponent 'Temperature sensor downstream of charge air cooler' has an open circuit or short circuit to po- sitiveP30040BComponent 'Temperature sensor downstream of charge air cooler' has an open circuit or short circuit to positiveManufacturer communications
9Original wording in English
FREIGHTLINER, MERCEDES-BENZ
Reported code forms P30040B
Complaint Low Coolant warning with possible engine misfire caused by a leaking Charge Air Cooler (Intercooler), accompanied by one or more of the following possible fault codes related to the coolant system: P30040B:…
DODGE, FREIGHTLINER, MERCEDES-BENZ
Reported code forms P300494
The check engine light is illuminated, or the AdBlue warning is active, with recorded faults related to AdBlue quality or concentration. Complaint Customer reports an illuminated check engine light and or an AdBlue…
FREIGHTLINER, MERCEDES-BENZ
Reported code forms P300494
Check engine light or Adblue warning with fault codes P206B31, P203B31, or P300494 present in AdBlue (SCR) control unit (N118/5) Complaint The check engine light or AdBlue warning is activated, accompanied by one or…
FREIGHTLINER, MERCEDES-BENZ
Reported code forms P300494
Vehicles with SCR Generation 4: SCR/AdBlue® warning message cannot be reset with fault code P13DF00 or P300685 Complaint SCR or AdBlue warning message cannot be reset. All fault codes in the AdBlue (SCR) control unit…
FREIGHTLINER, MERCEDES-BENZ
Reported code forms P300494
Check engine light or Adblue warning with fault codes P206B31, P203B31, or P300494 present in AdBlue (SCR) control unit (N118/5) Complaint The check engine light or AdBlue warning is activated, accompanied by one or…
FREIGHTLINER, MERCEDES-BENZ
Reported code forms P30040B
Low Coolant Warning, Potential Misfire, and Absence of External Coolant Leaks Complaint Low Coolant warning with possible engine misfire caused by a leaking Charge Air Cooler (Intercooler), accompanied by one or more of…
Check vehicle applicability
20A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Freightliner | SPRINTER 2500 | 2024 |
| Freightliner | SPRINTER 2500 | 2023 |
| Freightliner | SPRINTER 2500 | 2022 |
| Freightliner | SPRINTER 2500 | 2021 |
| Freightliner | SPRINTER 2500 | 2020 |
| Freightliner | SPRINTER 2500 | 2019 |
| Freightliner | SPRINTER 2500 | 2018 |
| Freightliner | SPRINTER 2500 | 2017 |
| Freightliner | SPRINTER 2500 | 2016 |
| Freightliner | SPRINTER 2500 | 2015 |
| Freightliner | SPRINTER 2500 | 2014 |
| Freightliner | SPRINTER 2500 | 2013 |
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.