My car cranks but doesn’t turn over

I went to drive my MDX but when I turned the key to start it it just cranks and doesn't turn over. it has a new starter and alternator less then a year ago. What could the issue be?

My car has 160000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hi there. First, we need to determine what is going on. Does it crank and not start? or does the engine not crank/turn over? Cranking and turning over mean the same to technicians. You described it as cranking and not turning over, but it sounds like you meant that it’s cranking and not starting. There could be many possible reasons for this, but it depends on if the engine is turning/cranking or if nothing is happening. It could be a battery, no fuel, failed sensors, or a number of things. Before guessing at what could be going on, I strongly suggest having a qualified technician perform an inspection to avoid replacing unnecessary parts. YourMechanic has several available technicians that can assist you with a no-start inspection so that this can be repaired correctly.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

Damaged CV joint: The most common cause of a clicking or popping sound from the wheels is a broken CV joint.
The most common reasons an Acura MDX won`t start are a dead battery, an alternator problem, or failed starter.
The most common reasons an Acura TL won`t start are a dead battery, an alternator problem, or failed starter. Search our network of RepairPal Certified shops near you to speak with a technician about your issue.
Car Makes a Series Of Rapid Clicks

This lack of electrical current could be because of a failing battery, a bad connection at the battery or even a bad alternator that isn`t properly recharging your battery. Best case scenario, your battery or posts need cleaning.

It might be a battery or alternator problem.

Perhaps your battery`s dead, or your alternator, which charges the battery, isn`t working correctly. If the source of the clicking is electrical, the starter (a small motor energized by the battery that gets the engine running) doesn`t have enough juice to stay powered.

Fortunately (spoiler alert) the root cause of a no-crank is almost always simple. Most of the time it`s simply due to a low or dead battery, or voltage drop through a corroded connection. Rule those out before you suspect the starter itself.
Worn wheel bearings can make all kinds of noises, from snapping, grinding, and humming to the clicking and popping sounds under debate. Symptoms of worn wheel bearings include uneven tyre wear, wheel vibrations, and oddly performing brakes.
A buzzing, clicking, humming, roaring noise from inside the transmission is usually a symptom of a bad bearing, planetary gears damage, or other internal problem. A buzzing could also come from a bad internal sealing surface, a seal, or low transmission fluid due to a leak.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Car is idling at high rpm’s and when the days are hot the car cranks but doesn’t turn on and also exhaust is smoking when i rev it
ANSWER : Hello – your symptoms suggest worn piston rings or valve stem seals (smoking), and a possible air leak in the intake, or idle air control valve sticking open (high idle). Both are signs of a higher-mileage engine with significant wear. I recommend an engine inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs.

Car won’t turn over. No lights come on when I turn it. Can’t even lock my doorsvor push the seat up or back.
ANSWER : Your probably correct, it sounds as though your battery is done. But it also sounds like you have charging system issues. I’m not sure that fixing your battery and charging system will solve the problem with the car shutting off, but it’s possible that it will and it’s a darned good place to start. By contacting Your Mechanic, you can have a technician come to your home or office to check out your car and help you figure out what to do next.

As I’m driving, all my lights inside/out of the car turn off and the car still stays on. But when I turn the car off it won’t turn over
ANSWER : Hello there. The charging system on the car may not be charging the battery as you drive and the systems that keep the engine running are priority so the engine will stay running until the voltage drops below about 9 volts but the lighting and some other accessories may cut off above this voltage first. You should have the charging system tested to see if the alternator needs to be replaced.

The starter off and on wont turn over when trying to crank the car.
ANSWER : Hello, thank you for writing in. Often when starters are installed they come with a shim. These shims need to be installed to help hold the starter at the proper angle. If the angle is off the gears may not mesh correctly putting excess pressure on it that the starter cannot compete with. If the starter did not come with a shim, or you do not have it anymore, you can likely purchase or fabricate one relatively easily. If this does not solve the issue, make sure there are no wires that are being pinched or shorted out when the full weight of the car is being supported. For more help diagnosing the issue, contact our service department to schedule an appointment. And thank you for you service to our country.

Engine turned off but inside of car still on, now engine won’t turn back on.
ANSWER : Hi there. The symptoms you’re describing with your boyfriend’s 2002 Grand Cherokee appear to be related to a broken or worn out ignition switch or relay. The ignition switch on the inside of the steering column is attached to multiple electronic connections that send signals to a relay box; which in turn, sends the signal to the individual components. The issue could be related to the ignition switch, the relay, or any of the components in between. If you want to have the fault pinpointed in person, I would have this starting issue inspected by a trained professional to ensure that the correct repair is made.

Car won’t crank when it’s cold and now won’t start at all
ANSWER : Hi there:

Usually this issue is cased by low cranking amps inside the battery. If you’ve recently had the battery replaced, it’s possible that an electrical component that makes up the charging system might be damaged or faulty. It’s also quite possible that the main electrical relay or the starter relay is giving you fits. To know for certain what the exact issue might be on your 1989 Toyota Camry, you should have a professional mobile mechanic complete a car is hard to start inspection, so they can pinpoint the source of your issues and recommend the right repairs.

Doesn’t turn on without the Check Engine Light coming on
ANSWER : Hi there. It sounds like the EFI relay is sticking or has resistance internally. This relay provides power to the engine computer. If it delays that power, then there is a delay in the Check Engine Light displaying and the engine starting. The Check Engine Light is there during start up to show that the engine computer is on and powered up. Try replacing that relay and see if the condition continues. I suggest having a qualified technician perform an inspection to avoid replacing unnecessary parts. YourMechanic has several available technicians that can assist you with a starting issue inspection and service your ECM relay as necessary.

When I turn on my AC the radiator fans do not turn on. The fans do come on when the car warms up so I know they are working and the fuses are good. The AC compressor does come on and the air blows ice cold when the car is moving. Car is a 2006 Chrysler Sebring Sedan 2.7l v6.
ANSWER : The control circuit for the fans needs to be checked. For example, there is usually a condenser fan relay in the A/C electrical controls. There could be a fault with that relay and/or wiring problems, perhaps even just a loose connection, blown or loose fuse, and so forth. To resolve something like this, the recommended service is an electrical component diagnostic. If you request that diagnostic service, the responding certified mechanic will get the problem pinpointed and resolved. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.