Or, you're oil pressure light is coming on to tell you have a oil pressure below the spec. Don't know the figure on the Commander, on most Chrysler vehicles its below 10PSI +/- 4PSI.
The first trouble shooting step in the manuals will tell you to connect a mechanical oil pressure gauge to the engine and confirm the actual oil pressure. Those gauges are expensive and it takes time to connect it.
When and under what conditions the light comes on can be telling, whether you truly have low oil pressure or if the warning light circuit or sensor is malfunctioning.
Remember, as the engine wears the gap between moving parts increases and thus oil pumped into those gaps to lubricate can flow through the larger gap, the oil pressure will drop, the pump itself wears as well. Low oil pressure can also be an indication of engine wear. Low or high oil pressure can be a symptom of malfunctions, such as debri in the oil passages clogging the oil flow, a clogged oil filter, a leak, etc....
The colder the engine (thus the oil), the more viscous the oil and it thins to less viscous with more heat. Thus the oil pressure should be highest when cold and lowest when warm, and the oil pressure goes even lower if the engine is running hot or overheating. The lower the rpm the slower the pump moves, thus lower oil pressure.
The engine at full operating temp, at idle, in gear, thus hot at its lowest rpm, the oil pressure should be 17PSI or more. As rpm increases, the oil pressure should increase, to 55PSI or more. The FSM sometimes has specs to check oil pressure, and its typically the hot, idle in gear spec and an RPM spec where the oil pressure should be higher than when you hit that rpm, maybe several of those.
A cold engine, the colder the oil, first start on a cold morning should be high oil pressure. A hot engine, as in overheating will lower the oil pressure and could light the light.
So if the oil pressure light comes on consistently in conditions when you would expect the engine to have its lowest oil pressure, and never lights when you expect the engine would have higher oil pressure, it could be a good light telling you have low oil pressure.
BUT, if the oil pressure light stays out in conditions when you would expect the lowest relative oil pressure, and comes on in conditions when the oil pressure should be relatively higher, the sensor or circuit is a possibility to consider. Foreign debri in the engine oil passage or pick-up screen could cause true low oil pressure in those conditions so don't rule it out.
OK, the system works simply by a light on the dash that has a 12VDC power supplied to it all the time, the ground wire for the bulb runs down a single wire to the sensor. When the sensor sees less than the specified pressure, it closes a switch to complete the ground circuit for the light and light the light.
A bad pressure switch/sensor could cause the light to come on erroneously, an intermittent short circuit in the circuit could case this as well. Oil or contaminants in the connectors can also do it. Again, if the light comes on when it should if you had low oil pressure, don't rule out an oil pressure problem with the motor. If the oil pressure light is coming on at times it shouldn't and NOT when it should if you had low oil pressure, then suspect the sensor or its circuit.
The "White Tab", that is NOT a tab to unlock the connector in your photo, the connector can be used as a 2 wire or 1 wire connector, in your case, it only needs 1 wire, and that white square in the photo is just a plug in the connector to fill the opening for a 2nd wire. The red plastic slide clip is on the side of the connector, NOT top. Usually it has to be slide/forced to slide sideways to unlock the main clip, that you have squeeze as you pull the connector off.
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