Your car won't start and you have to go to a very important meeting! No stress, you don't have to be a mechanical genius to be efficient. By scrupulously following the advice in this article, you will simply remedy the problem and restart your Citroen Grand C4 Picasso.
To begin with, we will try to analyze the sources that may be preventing your car from starting.

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Reasons that prevent your Citroen Grand C4 Picasso from starting

It is likely that the battery did not take the fact that you left your headlights on all night, or otherwise that the vehicle key was left in the ignition.
To make sure this is due to the battery, and not other causes, first check the lighting of your headlights. Indeed, low intensity or no lighting would be a bad sign for your battery.

Different causes for a Citroen Grand C4 Picasso that will not start

The battery is preventing my Citroen Grand C4 Picasso from starting
In the majority of cases, for a Citroen Grand C4 Picasso which does not start, it is the battery which is responsible because it is this which gives the necessary energy to the starter to start the engine.
Maybe check to see if some lights come on on your dashboard. Refer to the light on which will indicate the fault.
If your Citroen Grand C4 Picasso jerks when you turn the key, it is probably the battery that is low, and therefore needs to be recharged.
Small tip that could do you a big favor, you should keep jumper cables in your Citroen Grand C4 Picasso, you will save a tow.
If someone around you owns the cables, they will be able to recharge your battery sufficiently so that you can restart the engine and the battery will charge on its own afterwards. Wait a few minutes before getting back on the road even if your car is on, it would be stupid to stall at the 1st red light and have to repeat the operation.
Weather conditions make it difficult to start my Citroen Grand C4 Picasso
Let's move on. Let’s assume that your battery has therefore been recharged, but unfortunately your Citroen Grand C4 Picasso still does not start. As a first step, you should be aware that humidity and temperature changes create oxidation which can get on the battery terminals, making it dirty and preventing it from functioning.
When in good condition, the terminals are a metallic gray. If they have changed color, it is wiser to clean them. It is necessary to do this with an iron brush or sandpaper. Use a dab of thick fat before rubbing.
Starter for your Citroen Grand C4 Picasso
So you have followed our advice so far but your Citroen Grand C4 Picasso still does not start. Now is the time to worry about the starter, this little electric motor responsible for starting the engine of the car.
Remember that in order for it to remain effective over time, simple actions are required. It is possible to give a few small jolts on the pointed part of the starter, in order to take off the coals and thus make their passage easier.
Keep in mind that this part does not have a specific lifespan, everything will depend on its use, that is to say the maintenance of your Citroen Grand C4 Picasso. When it does not work well, it is usually caused by poor electrical contact, which is often related to hot weather. This reduces the conductivity of metals. If it is not hot, the failure is elsewhere

Another manipulation to try to start your car, put your Citroen Grand C4 Picasso on a slight slope and by operating the clutch pedal in second, the engine races and will probably end up starting. This is the solution if your battery is dead and it did not allow the starter to be cranked. In this solution, you just don't use it.
Alternator of my Citroen Grand C4 Picasso
If, on the other hand, after having driven a few kilometers, your battery has not recharged (so that it is still not possible to turn it on with the ignition), you are faced with two alternatives, where your battery from your Citroen Grand C4 Picasso is dead, option n2 is the alternator. The purpose of the latter is precisely to recharge it when you ride. So it could be that your battery is working fine, but the alternator has not been able to recharge it.

Conclusion on your Citroen Grand C4 Picasso which will not start

If despite all this you cannot find the fault, it is still recommended to go to an expert who can make a diagnosis in order to be more precise, which prevents your Citroen Grand C4 Picasso from starting. Keep everything that has been mentioned in mind in order to accompany him with information that could help him regarding the breakdown of your Citroen Grand C4 Picasso.