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My 2014 Impala LS (2.5L Ecotec) is throwing an OBDII code for P055b. Immediately checked oil level with dipstick, all is fine there. I'm assuming that the sensor/switch (whichever it is) has simply failed. Problem is, I don't know precisely where it is. Considering that sensor "B" is failing, I'd think that sensor "A" also exists. I can see what I think is one, right on top of the engine by the intake solenoid (circled in red). But, I've not been able to find the other. Is this sensor B? If not, does anyone know where on the engine it is?

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  • Welcome to Motor Vehicle Maintenance & Repair! – Pᴀᴜʟsᴛᴇʀ2 Oct 24 '18 at 13:56
  • Thank you! Hoping the community can help me out, and vice versa. :) – Scott Hoffman Oct 24 '18 at 14:00
  • RockAuto.com is only showing one sensor (though it could be used two times). It should look like this. I'm not sure where it would be at on the engine, though. Looking at the trouble code online, it suggest getting a pressure reading directly from the port, though it doesn't give a diagnosis as to what the issue is after the fact if you get a good oil pressure reading. – Pᴀᴜʟsᴛᴇʀ2 Oct 24 '18 at 14:49
  • I'm pretty sure the 'b' at the end of the code does not indicate this is the "B" sensor, but rather just the trouble code itself. There's also a P055c code, but no P055a as far as I can tell. – Pᴀᴜʟsᴛᴇʀ2 Oct 24 '18 at 14:54
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On the LKW engine P055B "Intake Camshaft Position Actuator Oil Pressure Sensor Performance" refers to the cylinder head oil pressure sensor. Circled in your picture. The engine oil pressure sensor is located on the block under the intake manifold. Up and right from the oil level switch shown in the picture.

  • Ended up taking it to my local shop to be safe, they determined the same. Thanks, shame I wasn't patient enough for your answer. XD – Scott Hoffman Oct 30 '18 at 20:37

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