The car won't start: 12 reasons and what to do right now

Have you turned the key in the ignition, but the engine is stubbornly silent, clicks or the starter turns “idle”? The situation is familiar to every second driver - according to statistics 37% of calls to car services are somehow related to startup problems. Good news: in 80% of cases You can fix the problem yourself without resorting to a tow truck. The bad: if you ignore the first “bells”, the repair will cost 2–5 times more expensive (for example, replacing a burnt out starter with Toyota Camry costs on average 28,000 ₽, while its preventive cleaning costs 3,500 ₽).

In this article - step-by-step analysis of the reasonswhy the car does not start, taking into account the symptoms (clicking, silence, slow rotation of the starter), as well as emergency instructions on the road or in the garage. We will not waste time on abstract advice - only concrete actions, tested VAZ, Hyundai/Kia, Volkswagen and Renault last generations. For convenience we added diagnostic table by sounds and checklist for self-checking.

1. The starter does not turn, the car is silent: check the battery

If when you turn the key there is no reaction - no clicks, no starter hum - either a discharged battery or an open circuit is to blame. Let's start with the battery: even a new battery can die overnight due to leakage current (the norm is up to 50 mA, but if the generator or alarm system malfunctions, this figure increases 10–20 times).

How to check:

• 🔋 Turn on the headlights: If they glow dimly or go out when you try to start the car, the battery is low.
• 🔊 Listen to the sounds: A clicking sound from the starter relay when you turn the key indicates that there is voltage to the battery, but not enough to crank.
• 📊 Measure the voltage multimeter: normal - 12.6–12.8 V with the engine turned off. If less 11.8 V - the battery is low.

What to do:

• 🔌 Light a cigarette from another car (instructions below) or use a jump charger (NOCO Boost Plus, CARKU E-Power Elite).
• 🔄 Remove the terminals, clean them from oxidation (use a soda solution + brush), check the tightness.
• 🔋 Charge the battery electric shock 10% of capacity (for example, for a 60 Ah battery - 6 A) for 8–10 hours.

⚠️ Attention: If after lighting the car the car starts, but after 5-10 minutes it stalls, the problem is generator (does not charge). You cannot drive in this condition: the battery will be completely discharged, and the electronics may fail.

2. The starter clicks, but does not turn: the relay or solenoid is to blame

Single or multiple click under the hood when turning the key - a sure sign of problems with solenoid relay or Bendix starter. In 60% of cases, the relay is to blame: its contacts burn out due to high currents (especially on machines with diesel engines or turbocharged petrol). Less commonly, the problem is a winding break or mechanical wear of the bendix.

Diagnostics:

• 🔧 Knock on the starter with a wrench (not too much!). If after this the car starts, the bendix or retractor is to blame.
• 🔌 Check voltage on the retractor control wire (thin wire on the relay): there should be 12 V when turning the key.
• 🛠️ Remove the starter and check the movement of the Bendix gear - it should move easily in one direction and be blocked in the other.

Repair:

• 🔧 Replace the solenoid relay (costs 800–2,500 ₽ depending on the model). On Lada Granta or Kia Rio this can be done in 20 minutes.
• 🔄 Cleaning contacts: if the relay is dismountable, clean the “nickels” with sandpaper (600–800 grit).
• 🚗 Check weight: Clicks often occur due to poor contact of the negative wire with the body.

Symptom	Probable Cause	Remedy
Single click, starter does not turn	Solenoid relay burnt out	Replacing a relay or starter
Multiple clicks	Low battery or bad ground	Charging the battery, cleaning the terminals
Click + crackle	Bendix or flywheel wear	Replacing the starter or flywheel
Click + burning smell	Short circuit in the starter winding	Starter replacement

Check the voltage on the battery|Tap the starter (lightly!)|Test the solenoid relay with a multimeter|Inspect the ground contacts on the body-->

3. The starter turns, but the engine does not start: fuel vs ignition

If the starter vigorously rotates the engine, but the engine does not “catch”, the problem lies in one of three systems: fuel supply, ignition or sensors. Let's start with the simplest thing - checking the fuel pump.

Fuel system diagnostics:

• 🔊 Listen to the fuel pump: When you turn the ignition on, you should hear a whirring sound from under the rear seat (on most cars). Its absence is a sign of a pump or relay malfunction.
• 🛢️ Check fuel pressure: there should be a nipple on the injector ramp (screw on the pressure gauge - the norm for most cars: 2.5–3.5 bar).
• 🔥 Inspect the candles: if they are dry, no fuel is supplied; if they are filled with gasoline, the problem is in the ignition or temperature sensor.

Ignition diagnostics:

• 🔌 Check the spark: Unscrew the spark plug, put a high-voltage wire on it and attach it to ground (engine body). When the starter is cranked, a spark should occur.
• 📊 Measure the resistance ignition coils: for most models the norm is 0.5–2 Ohm (primary winding) and 6–15 kOhm (secondary).
• 🛠️ Inspect the armored wires: Cracks or breakdowns in insulation lead to current leakage.

⚠️ Attention: On machines with GDI engines (for example, Mitsubishi ASX, Hyundai Santa Fe) the pressure in the fuel rail reaches 5–7 bar. Do not try to measure it with improvised pressure gauges - they may not withstand the load!

How to check the fuel pump relay?

The fuel pump relay is usually located in the fuse box under the hood or in the passenger compartment (see diagram for your model). To check its functionality:

1. Find the relay according to the diagram (usually labeled Fuel Pump).

2. Remove it and inspect the contacts for melting.

3. Swap places with a similar relay (for example, a cooling fan) - if the fuel pump starts working, the problem is in the relay.

4. The engine “starts”, but does not start: sensors and ECU

If the engine makes several "flashes" but does not start, the culprit is sensors or electronic control unit (ECU). Most often it fails:

• 📡 Crankshaft sensor (CPCV): Without its signal, the ECU doesn't know when to fire the spark. Symptom: the engine does not start at all or stalls immediately after starting.
• 🌡️ Coolant temperature sensor (DTOZH): if he is lying, the ECU incorrectly calculates the mixture composition (especially critical in winter).
• 🔥 Throttle Position Sensor (TPS): If it malfunctions, the engine may “flood” the spark plugs with gasoline.

How to check:

• 🔧 Count the mistakes scanner (even a simple ELM327 for 500 ₽ will show critical). Codes P0335–P0338 - problems with DPKV, P0115–P0119 - DTOZH.
• 📊 Ring the sensors multimeter:
  • DPKV: winding resistance - 500–700 Ohm.
  • DTOZH: resistance changes when heated (for example, to VAZ at 20°C — 2–3 kOhm, at 80°C — 300–400 Ohm).
• 🔄 Check the ECU power supply: on the unit connector there should be 12 V (contact +B) and stable “mass”.

If the sensors are in order, but there are errors, it is possible ECU firmware failure. In this case, only flashing will help (cost - from 2,000 ₽). On machines with chip tuning (for example, Skoda Octavia A7) such problems occur more often due to “crooked” firmware.

5. The car does not start when cold: reasons and solutions

Cold start problems are a scourge diesel and old gasoline engines. In 70% of cases the culprits are:

• ❄️ Glow plugs (for diesel engines): if at least one does not work, the engine will not start at temperatures below +5°C.
• 🛢️ Thickened oil: at -20°C even synthetics 5W-40 may not be pumped through the system.
• 🔥 Weak spark: in cold weather, a more powerful discharge is required to ignite the mixture.
• 📉 Low compression: In a worn-out engine, the air-fuel mixture is not compressed enough to ignite.

What to do:

• 🔥 Warm up the glow plugs (for diesel): turn on the ignition for 10-15 seconds, then try to start. Repeat 2-3 times.
• 🛢️ Use "quick start" (for example, Mannol Motor Starter): Spray 2-3 seconds into the intake manifold.
• 🔋 Recharge the battery: In cold weather, battery capacity drops by 30–40%. If the voltage is lower 11.5 V, the starter will not be able to crank the crankshaft.
• 🔧 Check compression: standard for gasoline engines - 10–13 bar, for diesel engines - 20–30 bar.

⚠️ Attention: Do not use ethereal "quick starts" on turbocharged engines - this can lead to detonation and damage to the turbine. For such engines, special compositions based on propane-butane are suitable.

6. The car does not start when hot: diagnostics and repair

If the engine refuses to start after stopping (for example, at a gas station or in a traffic jam), the reason usually lies in:

• 🔥 Fuel pump overheating: when hot, gasoline in the line can boil, forming vapor locks (relevant for VAZ 2110–2115, Daewoo Nexia).
• 🛢️ Temperature sensor malfunctions: The ECU “thinks” the engine is cold and floods the cylinders with fuel.
• 🔌 Problems with ignition coils: When heated, contact in the windings may disappear.

Solutions:

• ⏳ Wait 10–15 minutes: If vapor locks are to blame, the gasoline will cool down during this time.
• 🔧 Check the fuel pump: when hot, it should buzz smoothly, without interruption. If the sound is intermittent, the pump requires replacement.
• 📊 Measure the coil resistance on a hot engine: if it is outside the normal range, the coil needs to be changed.

On diesel engines (for example, Volkswagen Passat B6) the problem may be injection pump (high pressure fuel pump). When overheated, the plunger pairs jam - in this case, only repair or replacement of the pump will help (cost - from 30,000 ₽).

7. How to light a car correctly: step-by-step instructions

If the problem is a dead battery and you have a donor on hand, lighting it is the fastest way to start the car. However incorrect connection can damage the electronics of both vehicles. Follow the algorithm:

Procedure:

1. 🔌 Mute the donor and turn off the ignition on both cars.
2. 🔴 Connect "plus": red wire to + discharged battery, then to + donor.
3. ⚫ Connect "minus": black wire to – donor, and the other end - to unpainted metal part (eg engine block) discharged car (NOT to the negative terminal!).
4. 🔋 Get a donor and let it run for 5-10 minutes at 1,500-2,000 rpm.
5. 🚗 Try starting your car. If it doesn't work, wait another 5 minutes.
6. 🔌 Unplug the wires in reverse order: first “minus” from your car, then from the donor, then “plus”.

⚠️ Attention: Do not light the car with lithium battery (installed on some hybrids) - this may cause a fire! Also avoid lighting a cigarette if the battery is low swollen or leaking.

Make sure that the voltage of the donor and recipient batteries is the same (usually 12 V)|Check the integrity of the wires (no exposed areas)|Do not touch the body while connecting|Do not turn on powerful consumers (headlights, stove) when lighting a cigarette-->

8. When to call a tow truck: 5 critical cases

Not all breakdowns can be repaired on site. Here are the situations when you need to stop trying to start the car and call a tow truck or a mechanic:

• 🔥 Burning smell or smoke coming from under the hood: Wiring, starter or alternator may be on fire.
• 💥 Knocking or grinding noise when the starter rotates: a sign of destruction of the flywheel or bendix.
• 🛢️ Fuel or oil leak under the car: risk of fire or engine seizure.
• 📵 Complete lack of response to ignition (even clicks): the ECU or main relay may have burned out.
• 🔋 The battery is swollen or leaking: Further startup attempts are dangerous.

The cost of a tow truck in Moscow and the region is from 1,500 ₽ (passenger cars) to 3,000 ₽ (SUVs). If you are in another region, check the rates in advance: for example, in Yekaterinburg the average price is 1,200 ₽, and in Krasnodar — 1,800 ₽. When calling, please specify:

• 📍 Exact address (including access roads).
• 🚗 Car make and model (the type of tow truck depends on this).
• 🔧 Reason for call (for example, “won’t start, suspect starter”).

If the car is under warranty, do not agree to repairs at the first service you come across — evacuate it to an authorized dealer. Do-it-yourself repairs may void your warranty.

FAQ: Frequently asked questions about startup problems

❓ The car does not start after washing the engine - what to do?

Most likely, water got on electrical contacts (starter, ignition coils, generator). Proceed like this:

1. Open the hood and dry the engine compressed air (you can use a tire compressor).
2. Remove the battery terminals and dry them.
3. Check fuses - they could burn out from a short circuit.
4. If the car does not start, call an auto electrician for diagnostics.

Do not try to start the car immediately after washing it. - this can lead to a short circuit and failure of the ECU.

❓ Why doesn’t the car start after refueling?

Probable reasons:

• 🛢️ Bad fuel: If you refuel at a questionable gas station, drain the gasoline and flush the system.
• 🔥 Fuel filter clogged: Dirt from the tank rose and clogged the mesh.
• 📉 Air lock in the fuel line (relevant for diesel engines).

What to do:

1. Try starting the car with pressed gas pedal (for gasoline engines).
2. If it doesn’t help, drain the fuel and fill it with new fuel (preferably from another gas station).
3. For diesel engines use bleeding the fuel system (hand pump or “pear”).

❓ Is it possible to start a car from a pusher on an automatic machine?

No! On vehicles with Automatic transmission This launch method is strictly prohibited - it will lead to box breakage (wear of friction clutches, destruction of the planetary mechanism). The exception is some models with CVT (for example, Nissan Qashqai), but even there the risk is very high.

Alternatives:

• Light a cigarette from another car.
• Use a jump charger.
• Call a tow truck.

❓ How much does it cost to diagnose a startup fault in the service?

The cost depends on the type of diagnosis:

Type of diagnosis	Average price (₽)	What does it include
Computer (scanner)	1 000–2 500	Reading ECU errors, checking sensors
Electric	1 500–3 000	Checking the starter, generator, battery, wiring
Fuel system	2 000–4 000	Pressure measurement, checking injectors, pump
Comprehensive	3 000–6 000	All of the above + compression test

Some services offer free diagnostics if you agree to have them repaired. Check this in advance!

❓ How to prevent starting problems in winter?

Preventive measures:

• 🔋 Check the battery before winter: voltage should not be lower 12.5 V, and the density of the electrolyte is 1.27 g/cm³.
• 🛢️ Refuel with quality fuel: use in winter winter diesel fuel (with additives) or gasoline with an octane rating 1–2 units higher than recommended.
• 🔥 Change spark plugs every 30,000 km (or once every 2 years).
• 🛠️ Clean the injectors once every 40,000 km (using ultrasound or special additives).
• 🚗 Store your car in a garage or use car blanket for insulating the hood.

For diesel cars, be sure to use antigel (for example, Liqui Moly Diesel Fliess-Fit) at temperatures below -10°C.