Question about Dodge Ram 1500

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My check engine light comes on and warning bell will sound periodically when coming to a stop. When this happens, I notice my oil pressure gauge will drop all the way to or past the L then immediatly return to normal. There is no engine knocking to be heard at start up or when this occurs; all fluids are full. Also, stop lamp light randomly flashes and the alarm sounds. All bulbs are working when I check them.

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Sound as bad connection, inspect battery terminals and grounds, also inspect ignition switch connector for bad contact and burned out pins, if so need to replace switch and repair connector, did not stated what year or eng. size

Posted on Nov 17, 2009

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Posted on Jan 02, 2017

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Its possible the pressure light is faulty, or you really do have low oil pressure. The pressure is higher when the oil is cold than when the engine is warmed up.
You could replace the switch and see what happens, or get the pressure checked with a mechanical gauge in place of the switch.

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Which grade of oil did you use? Did you try to check the pressure with an oil-pressure gauge?

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Yes I would say the oil pressure switch is faulty. The oil pressure gauge uses a different sensor, so if the gauge did not drop but the warning light came on, I would have the warning light switch checked. If the warning light comes on, the fuel pump will stop getting power and you will lose fuel pressure too.

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1 Answer

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start by checking the ground strap to the engine, and engine to body. The oil pressure sender unit may be bad. You may have to hook up an oil pressure gauge to the oil pressure sender port to verify proper oil pressure. Senders are cheap- I would just replace it and go from there.

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If the valve lifters are quiet you most likely have oil pressure even with gauge showing "0".Sounds like the oil pressure switch going bad.I would try that first.

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If your oil gauge if you have one reads good pressure, more then likely you have a bad sensor, if you just have an oil light, take it to a repair shop where they can do an oil pressure test. Have it check, low oil pressure can cause major engine damage.

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Sounds like possiblity of the oil pump being bad, and is setting off other sensors on your car.

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My friend that alarm is telling you u have low oil pressure, do you want to destroy the new engine?? Find out if the eng really has low oil pressure, it may just be a defective oil press sending unit causing the alarm, have the press checked with a mechanical guage or just replace the sender and see if that cures the issue, the alarm is part of the Body Control Module and can't be disconnected.

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