Reference meaning
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.
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A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
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.
Scan worksheet →Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P04DBcrankcase ventilation system disconnected
P04DB-00Crankcase Ventilation System Disconnected
P04DB-00Crankcase Ventilation System Disconnected
Manufacturer communications
67Original wording in English
KIA
TECHNICAL SERVICE BULLETIN: CRANKCASE EJECTOR INSPECTION/REPLACEMENT (SA650) - This bulletin provides instructions to inspect and, if necessary, replace the PCV ejector on certain 2027MY Telluride Hybrid (LQ2AH) vehicles produced from December 4, 2025, through March 20, 2026. Affected vehicles may display an illuminated Malfunct…
FORD
Recommended Repair Prior to Sale Customer Satisfaction Program 26P04 Certain 2025 Model Year Bronco and Ranger Vehicles with 2.7L Engine Setting Diagnostic Trouble Code (DTC) P04DB Powertrain Control Module Software Update
FORD
Some 2025 Bronco/Ranger vehicles equipped with a 2.7L EcoBoost engine may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P04DB stored in the powertrain control module (PCM) with no other relevant DTCs present. This may be due to the software in the PCM.
FORD
Some 2025 Bronco/Ranger vehicles equipped with a 2.7L EcoBoost engine may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P04DB stored in the powertrain control module (PCM) with no other relevant DTCs present. Refer to Workshop Manual (WSM), Section 303-08B Engine Emission Control > Di…
Check vehicle applicability
375A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Alfa Romeo | GIULIA ↗ | 2018 |
| Alfa Romeo | GIULIA ↗ | 2017 |
| Alfa Romeo | STELVIO ↗ | 2019 |
| Alfa Romeo | STELVIO ↗ | 2018 |
| Chevrolet | SILVERADO 2500 ↗ | 2025 |
| Chevrolet | SILVERADO 3500 ↗ | 2025 |
| Ford | BRONCO ↗ | 2025 |
| Ford | BRONCO ↗ | 2023 |
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.