Rick's Free Auto Repair Advice

Nissan Titan P0442 Evaporative Emission Control System Leak Detected (small leak)

At first glance this appears to be like any other P0442 Evaporative Emission Control System Leak Detected evaporative emissions leak. But if you’re getting this code and really poor engine performance, or the engine goes into “limp-in mode” you may have a broken or shorted wire.

The sensors receive a 5 volt reference signal from the PCM. As pressure readings change, the sensor varies the voltage and the computer reads that to determine input. In the case of a broken wire, the sensor never sees the voltage and the computer assumes a major fault. So if you get this code, first check to make sure you’re getting a good 5 volt reference signal at the sensor. There’s always the possibility that the PCM is shorted out and not sending out the 5-volt reference signal, but that’s fairly rare.

On Nissan Titans, some techs have found broken wires going to the rear harness and down to the evap pressure sensor. So focus in on that harness before you start throwing parts at the problem.

For more information on this repair or any others for your vehicle, buy an online subscription to either Alldatadiy.com or eautorepair.net. Click on this link to compare the two services: Compare Alldata and Eautorepair.

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© 2012 Rick Muscoplat

Posted on by Rick Muscoplat


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