P04DB Ford F150: Understanding and Fixing Common Engine Trouble Codes

Today, we will be addressing a common issue on the 2018 Ford F-150 with a 2.7 liter ecoboost engine. The problem at hand is a disconnected hose in the PO4DB crankcase ventilation system. Interestingly, there is a Technical Service Bulletin (TSB) addressing this very issue.

The TSB indicates that the problem could be due to an incorrect positive crankcase ventilation valve being installed. If the PCV valve is brown, further diagnosis is required. If it is gray, the valve needs to be replaced and the DTC cleared for a retest.

Upon inspection, it was discovered that the PCV tube was indeed disconnected for quite some time. The recommended solution is to reconnect the hose and clear the code to run a crankcase test.

It’s important to note that the PCV valve being black, not brown or gray, signified that it was still in good condition. As a result, no replacement was necessary, and the entire line needed to be replaced if it came to that.

After retesting with the engine running, it was evident that the issue was resolved by simply reconnecting the PCV tube. This kind of problem often leads to the PO4DB code being generated due to excessive crankcase pressure or malfunctioning tubing sensors.

During the diagnostic process, other codes, such as the APIM code for a USB port, were also observed but were recognized as potential side effects of the diagnostic process rather than actual malfunctions. Resetting the codes and running the vehicle was all that was needed to clear up the issues.

After an eight-mile test drive, the problem did not resurface, confirming that the fix was successful. In conclusion, this case demonstrated that a seemingly complex issue could be resolved with a straightforward fix, which in this instance involved simply reattaching the tube.

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