You are certainly faced with a vehicle that will not start, and let's face it, there is nothing more annoying and stressful than having your vehicle immobilized without understanding the reason. Newer cars are full of electronics and the causes of this kind of breakdown can be multiple. In this article, we will be interested in the case where you have already tackled the problem and tried a first intervention, and suddenly, help you understand Why does your car not start even though the battery is new?

This may seem illogical because the most common cause of a vehicle that cannot start is an HS battery, however, this is not the only possible reason, we will see at first, what is which may explain that your car does not turn on even though the battery has just been changed. Then, in a second step, some advice to optimize the life of your battery and avoid ending up with a stationary vehicle.

Why does my car not start even though I have a new battery?

why my car does not start even though the battery is new

The causes of a car that won't start, but with a new battery

We therefore begin this article by tackling the causes, it is in our opinion the most important step, the expertise is the most delicate part of the mechanics. Fortunately, even if recent engines are more and more complex, modern mechanics allow us to find a good number of leads and that in a quick way to explain the origin of your problem.

As we can imagine, you must be disappointed, if you have just changed the battery in your car, you probably thought that was the reason for your worries… And that's normal, it's the most common explanation of a vehicle that does not want to start. However, you are still doing the right thing to change the battery, because while this is not the cause of your problem, it is. important to change it every 5 years, and, in general in this kind of case, it is strained and often completely discharged which damages it greatly.

We will now present to you in turn the other possible causes which may cause your car not to start, even with a new battery:

  • An HS starter can prevent a car from starting even with a battery that has just been changed: Obviously, the starter is the component of your car which allows it to be ignited thanks to a small electric motor. Two faults can occur with the starter, or it has worn out and the coals are stuck, which prevents it from running and therefore from starting your engine. Either it no longer reacts, because of an overload or a bad electrical connection.
  • If you have a diesel, glow plugs can prevent you from starting: Their function is to heat the fuel to facilitate cold starting. Unfortunately when they are faulty, you can experience starting problems in cold weather, possibly loss of power and higher than normal fuel consumption.
  • An immobilizer problem: The immobilizer is a mechanism fitted on all modern cars which is used to prevent your vehicle from being stolen. It is a security system which recognizes a frequency emitted by the key and which authorizes your car to start. If your immobilizer is not functioning properly, your vehicle may not start, even with a new battery.
  • Unstopped energy consumption: You may not have realized it, but it is also possible that it was a consumer that is still on and that you were not aware of. He could also be responsible for the battery change you have just made. This may be a light that has remained on (like a ceiling light or a night light) or have an energy leak due to a bad connection which drains your battery.

What to do if your car does not start after you have changed the battery?

Now that you have discovered the various issues that can prevent you from starting up after you have just purchased a battery, now is the time to solve your case and find the exact origin of this problem. Do not hesitate to consult our guide to understand why your new car battery is discharging. We advise you to follow these tests in the order in which they are presented to you, from the most basic to the most complex cause:

  • Switch on the ignition of your vehicle and check if the lights on your dashboard come on, and if so, if they are normal. Indeed, if your lights do not come on at all or they flash randomly, it means that your new battery is already empty… It is therefore a problem of energy consumption that you are facing. If you turn the key to start, nothing should happen in this case. To be sure that your concern is only related to the battery, you can try starting it with cables and the help of another moving vehicle. If it works, it is most likely only the battery and possibly a current leak that is causing your failure.
  • Regarding the immobilizer which could prevent your car from starting after you have just changed the battery. Use duplicate keys or change the card stack if you are equipped with central locking, it will certainly solve your worries.
  • We will now have to look at the case of starter. As we told you it can be subject to two types of breakdowns, however the symptoms will be similar, your starter does not click when you turn the key. If your lights come on, you have power to turn on the radio, and when you turn the key it doesn't work, it's certainly the fault. The average price of a starter change is 450 €, however, if your car is equipped with a start and stop it will be much higher. Last option, the neiman contactor is HS. In any case, these concerns are not easy to resolve for people with little mechanical skills, we advise you to go see your mechanic.

Some tips to make your battery last and avoid the risk of your car not starting

car that does not start with changed battery

Finally, to finish our little guide on starting problems with new battery, we will give you some tips to improve the life of your battery and limit the risk of starting problems as much as possible:

  • Replace your battery every 5 years if it does not show signs of fatigue upstream
  • Remember to check that no electrical elements remain on when you stop the engine
  • Keep the battery terminals clean
  • Start by keeping the clutch pedal depressed.
  • Check your engine oil level regularly, even between oil changes