What Is Engine Code P Zero Four Four Two?

Throughout your vehicle’s lifetime, you will encounter a range of issues. For instance, your brake pads may become worn, your AC unit might start to produce an unpleasant smell, or your axle may break or bend and require a replacement job. 

These, however, pale in comparison to any engine issue you may have. Even minor issues with the heart of the car can bring about more severe problems and require a substantial investment to fix them. That’s why things like the P0442 code should never be ignored, as it does signal that there’s something seriously wrong with your ride.

What Does Code P0442 Mean?

Engine code P0442 means a small leakage in the evaporative emission control system. It is not a critical problem, but it could be annoying and cause something more serious. We recommend addressing it as soon as possible to avoid further problems.

P0442 is one of the Diagnostic Trouble Codes (DTCs) identified by the engine control module (ECM). If you have an OBD-II code scanner, you can identify the problem yourself and try some steps to solve it on your own. Otherwise, please drop by the repair shop, where a mechanic can help you out.

The evaporative emission control system (EVAP) prevents the escaping of gasoline vapors from the fuel system into the atmosphere. It redirects the vapors to a charcoal canister and then to an engine intake manifold. ECM checks the valves’ tightness and system pressure, and if the 0.2-0.4 inches leakage is detected, you can see the P0442 code. All codes from P0440 to P0457 refer to EVAP problems. A complete check-up of the EVAP system could take about an hour of labor and cost you $75-150.

The Signs And Possible Reasons For The P0442 Problem

You could notice that there is something wrong with the evaporative emission control system if:

•  You experience a strong gasoline smell in the vehicle.
• Increased fuel consumption.
• Check Engine light is on.
• Failed emissions inspection, as your car emissions increase and don’t meet ecological standards anymore.

When you notice some of the above, it is worth running some diagnostics. The possible reasons for P0442 could be:

• A fuel tank filler cap not closed tightly or broken.
• A leak in the fuel tank.
• A leak in the charcoal canister.
• A problem with the charcoal canister valves.
•  A leak in the EVAP hoses.

How To Deal With The P0442 Problem

If you managed to read the code, go to check the gas cap first. Then, loosen it as it’s the most common reason for leakage as many owners forget to tighten it properly. It could also get dirty, corroded, or a sealing ring cracked, allowing vapors to seep through. This is simply solved by replacing the cap, which should set you back by about 50$.

If this doesn’t help, the leak is probably elsewhere. It could be tiny and almost impossible to see, as in the case of worn-out cracked hoses. To discover the cause, the mechanics usually use thick-colored smoke. It is let into the fuel system under pressure and gets out from the leak points. The most severe cases could require the replacement of a tank or a charcoal canister which could cost up to $500. Sometimes it could be the fault of a purge valve working incorrectly. If the valves are clogged, this could obstruct proper functioning. Also, you need to check the incoming voltage – if it is not enough, there could be some electrical connection problem.

How To Remove The P0442 Code From The System

After you remove all possible leakages, the code disappears after some time. If it doesn’t, you probably need an OBD-II code scanner to remove it manually. When you take a car from the repair shop, don’t forget to make sure they take care of that post-procedure. But if you believe the problem should’ve been resolved, and the code is still there, the EVAP system requires additional tests.

Summary

The EVAP system is essential to prevent gas vapors from escaping the fuel system and polluting the environment. There are several different codes for its failure; P0442 is responsible for small 0.2-0.4 inches leakages.

This code often appears when the gas cap is loose, as it was damaged, or the driver forgot to tighten it after refueling. The mistake is not fatal, though, as the engine still works, and you can keep driving, just suffering from a gas smell and inefficient fuel consumption. In more severe cases, the tank, the charcoal canister of the EVAP, its valves, and hoses could leak, and the system needs a proper check-up.

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