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! Commented Oct 24, 2018 at 13:56
  • Thank you! Hoping the community can help me out, and vice versa. :) Commented Oct 24, 2018 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. Commented Oct 24, 2018 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. Commented Oct 24, 2018 at 14:54
  • Hi so my 2014 chevy malibu is giving me the same codes P055c P055b did replacing these sensors solve the issue? Thanks in advance
    – Rayanna
    Commented Mar 3, 2020 at 13:24

1 Answer 1


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 Commented Oct 30, 2018 at 20:37

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