Skip the auto shop - Our mechanics make house calls

Q: My oil pressure switch went out and haven't been able to start it since, what could be the issue? I have since replaced the part.

asked by on

Car just cranks. No turn over and no spark. Please help

My car has 173000 miles.
My car has an automatic transmission.

Hi, thanks for writing in. I recommend checking the fuel pump fuse and especially the fuel pump relay. Make sure you are getting power from the ignition switch to trigger the fuel pump relay. On newer (incl. 2000) GM vehicles, the oil pump switch is a backup electrical path to the fuel pump relay; only coming into play when the fuel pump relay primary path fails. The fuel pump relay may have completely failed at this point. It is also possible that the Pathlock Security system is shutting down the fuel pump for some reason. If the fuel pump fuse and relay check out as working properly, diagnosis of Pathlock issues is next on the diagnostic list, requiring a GM security diagnostic tool. I would recommend having YourMechanic.com diagnose the fuel supply issue, provide an accurate assessment of damage, and estimate the cost of repairs. YourMechanic.com can dispatch a mobile, professional mechanic to your location for diagnosis and repairs. Contact YourMechanic.com to request this inspection and to schedule an appointment.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  • Home
  • Questions
  • My oil pressure switch went out and haven't been able to start it since, what could be the issue? I have since replaced the part.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Leak in the brake line

Hello. With brakes being one of the more important systems on a vehicle, the vehicle should not be driven until it's repaired. I assume you know approximately where the leak is since you are seeing the result of the leak....

Q: Gas gauge doesn't work correctly and moves randomly registering wrong amount of gas

Yes, the fuel sending unit is part of the fuel pump module. If there is an open in the fuel sending unit this will can you the false readings you are experiencing. The tank will have to be dropped to...

Q: hard crank and smells like gas, spider injectors or mass flow

If the gas smell is coming from engine area and there is no leak that can be seen. Under the intake manifold is a fuel injection system that can leak fuel into the intake manifold. This will cause hard start...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...