5 reasons why your car won’t start in the cold
Tuesday 2nd December 2025
Winter brings chilling temperatures, icy roads, and the need for plenty of de-icer! But what happens if your car won’t start during the colder months?
Our guide highlights the 5 most common reasons why your vehicle may not start in the cold, so you can diagnose the problem and get back on the road quickly.
Why won’t my car start in the cold?
1. A weak or failing battery
One of the most common reasons why your car won’t start in cold weatheris a weak battery. When temperatures drop below freezing, chemical reactions inside the battery slow down, reducing its ability to deliver power—or preventing your car from starting altogether.
Signs of a flat battery include:
- A faint whining noise when you turn the ignition, but the engine doesn’t start
- Ignition lights failing to illuminate
- Central locking not working
If the battery is completely dead, you may hear nothing at all.
Find out more?signs of a dead car battery?now.
If you’re worried about your battery failing book a free battery check.
If it’s failing you may need to recharge it, or have your battery replaced . Learn more about our?battery replacement service.
2. Engine oil issues
Oil thickens in cold conditions, making it harder for the engine to turn over. You should consider using engine oil with a lower viscosity in winter to ensure the oil can flow and effectively lubricate all engine parts. Learn more about?choosing the right engine oil, and explore our?specialist oil supplement services.
3. Is there water in your fuel line?
In freezing temperatures, condensation in your fuel lines can freeze, blocking fuel from reaching the engine. This stops combustion and prevents the engine from starting.
When the ice thaws, water can enter your fuel tank, causing further complications. Learn more about our fuel saver service?at Formula One Autocentres.
4. Frozen engine components
If your antifreeze mixture isn’t strong enough, coolant can freeze in the radiator and engine. Frozen coolant can’t circulate properly, causing the engine to overheat or fail to start.
5. A bad starter motor
Cold weather puts extra strain on your starter motor—especially if your engine oil has thickened. Over time, this can cause the starter to wear out or fail.
Symptoms of a failing starter motor include:
- A clicking sound when you turn the key
- Intermittent starting issues that worsen in cold weather
Regular servicing can help to identify early signs of wear before the winter months arrive. Book your vehicle in for its?car service?now at your?nearest Formula One Autocentre.
