Q: Full power but no turn over when key is turned

asked by on

My car is exhibiting a problem with starting. When I turn the key there is full power, but it will not turn over at all. There is a new alternator in my car and I have checked the battery. I’m certain that the problem is not the starter. I have read that sometimes a problem like this can be caused by the ignition switch, or crankshaft position sensor might be bad. It is strange to have full power, but no turn over. What is causing this and how can a solution be found?

Hey there, I believe you are correct. The most likely cause of this issue you are having would be the ignition switch. The ignition switch is responsible for sending power from the battery to the starter when you turn the key. Many times, the ignition switch can only partially fail which will allow some functions to still work.

I would recommend having your ignition switch tested using the manufacturer’s recommended procedure by a qualified technician such as one from YourMechanic. If the ignition switch is faulty, the only way to get the vehicle to start would be to replace the ignition switch.

I think that the crankshaft position sensor is a possibility but not a very likely cause because many vehicles can still start and run with a bad crankshaft position sensor. Also, a bad crankshaft position sensor will not affect the starters ability to crank.

If the vehicle is at your home or office, you would normally have to tow it to a shop to get the repair. If you have the turning over problem inspected by YourMechanic, you can save the tow cost and have the issue repaired on site.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Full power but no turn over when key is turned

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: Problems with keyless start

With problems that are intermittent, it can be tricky to diagnose them. There is a common issue with these cars though, which is a failed brake light switch. This is the switch that indicates when you have applied the brake...

Q: Q: Ignition switch problem

A faulty ignition switch is the most common cause of the problem you are having, but it is not necessarily always the cause; for instance, you could have an issue with your ignition lock cylinder, or linkage. I recommend that...

Q: My car starts sometimes and other times it cranks over like normal but won't start.

First check on your vehicle service records to see if the maintenance is up to date. If you can smell fuel at the back of the car while the car will not start then you may have an issue with...

Related articles

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.