Have you turned the key in the ignition, but instead of the usual growling sound of the engine, there is silence or faint clicks? Or does the starter turn, but the engine refuses to start? If your car is with automatic transmission suddenly stopped starting, don’t rush to panic. In 80% of cases, the problem is solved without major repairs - the main thing is to correctly diagnose the cause.

Cars with Automatic transmission have their own characteristics when starting the engine. Here, not only standard components (battery, starter, spark plugs) play an important role, but also electronic transmission control systems, start blocking if the selector is in the wrong position, as well as specific sensors. In this article we will look at all possible reasons why a car won’t start automatically - from a banal battery discharge to rare malfunctions of the immobilizer and torque converter, and also give step-by-step instructions on what to do in each situation.

1. Checking the obvious: battery and contacts

Let's start with the simplest - battery. Even if yesterday the car started without problems, today the battery could be discharged due to:

  • 🔋 Headlights, radio or other consumers left on
  • 🌡️ Severe frost (battery capacity drops by 30-50% at -20°C)
  • 🔌 Faulty generator that does not charge the battery during the trip
  • 🕒 Natural wear and tear (battery life is 3-5 years)

How to check the battery without instruments? Turn on the headlights: if they glow dimly or go out when you try to start the car, the problem is in the battery. Also note charge indicator (if any) or sounds when turning the key:

  • 🔇 Relay clicks — the battery is discharged, but there is a small charge
  • 🔇 Silence - deep discharge or open circuit
  • 🔇 Slow starter rotation — the battery is almost dead
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If your car won't start because the battery is dead, DO NOT try to "light" it from another car with the engine running - this could damage the electronics. First, turn off the donor car, then connect the wires in the correct sequence: plus to plus, minus to minus (or to ground).

What to do:

  1. Try "lighting" from another battery (see advice above).
  2. Check the terminals - they should be clean and tightly tightened (oxidation or poor contact gives the same symptoms as a dead battery).
  3. If the car starts after "lighting up", be sure to check generator and relay regulator - they may be the cause of the discharge.
📊 How often do you check the battery condition?
Once a month
Only when problems arise
Never checked
I use the service center

2. Problems with the starter: how to distinguish from a dead battery

If the battery is in order (the headlights are bright, the dashboard works), but when you turn the key you only hear clicks or grinding sounds - the culprit is starter. In cars with automatic transmission, it experiences increased loads due to the greater weight of the transmission, so it fails more often than with a manual transmission.

Typical symptoms of a faulty starter:

  • 🔧 Single click when turning the key - the retractor relay is faulty
  • 🔧 Grinding or squealing — wear of the bendix (overrunning clutch)
  • 🔧 The starter turns but does not engage - problems with the flywheel crown
  • 🔧 Burning smell after several attempts to start - short circuit in the windings

How to check the starter without removing it? Try tapping the body lightly with a hammer or heavy wrench (don't overdo it!). If the car starts after this, it’s your fault. bendix or solenoid relay. You can also use a screwdriver to close two contacts on the solenoid relay (before doing this, put it in neutral and turn on the handbrake!). If the starter spins, the problem is in the relay.

What to do if the starter turns, but the car does not start?

If the starter rotates the engine confidently, but the engine does not start, the problem lies elsewhere:

1. Ignition system — check the spark plugs, coils, high-voltage wires.

2. Fuel system — the fuel pump may not be working or the injectors are clogged.

3. Sensors - especially the crankshaft position sensor (CPS), without which the ECU will not give the injection command.

4. Immobilizer - may block startup due to a malfunction in the key chip.

If the starter is faulty, it can be temporarily “reanimated” for a trip to the service:

Place the car in neutral (N) and tighten the handbrake

Turn on the ignition (turn the key to the ON position)

Push the car (need help or dodge)

At a speed of 5-10 km/h, sharply turn the ignition to the START position

If the engine starts, DO NOT turn it off until repaired-->

3. Automatic transmission selector in the wrong position: start blocking

One of the unique reasons why a car with an automatic transmission will not start is incorrect position of the gearbox selector. In most cars with automatic transmission, starting the engine is possible only when the lever is positioned in P (Parking) or N (Neutral). If the selector is in D (Drive), R (Reverse) or S (Sport), The ECU blocks the start for safety.

How to check:

  1. Make sure the lever is in position P (the indicator on the dashboard should be visible).
  2. Try changing the selector to N and try to start it again.
  3. If the lever does not move or is jammed, there may be a malfunction shift cable or lock solenoid.

What to do if the selector is jammed:

  • 🔧 Try rocking the lever left and right while pressing the brake (some models have a hidden release button).
  • 🔧 Click on Shift Lock button (usually located next to the selector, covered with a plug).
  • 🔧 If all else fails, repairs will be needed locking mechanism or replacing the cable.
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On some vehicles (for example, Toyota, Honda) starting is possible only in position P. If the indicator on the panel does not show the current position of the selector, the problem may be in the lever position sensor (limit switch).

4. Problems with the fuel system: from the fuel pump to the injectors

If the starter turns the engine confidently, but the engine does not start, the cause may be lack of fuel or its incorrect delivery. In cars with automatic transmission, this manifests itself in the same way as in manual transmission, but there are nuances:

  • 🛢️ The fuel pump does not pump — when you turn on the ignition, you don’t hear a characteristic buzzing sound in the rear seat area (for 2-3 seconds).
  • 🛢️ Clogged fuel filter — the engine may start, but immediately stall.
  • 🛢️ Faulty injectors - when the car is cold it starts poorly, when it is hot it starts normally (or vice versa).
  • 🛢️ Problems with fuel pressure regulator — the engine “troubles” or does not start due to too high/low pressure.

How to check the fuel system:

  1. Listen to whether the fuel pump works when you turn on the ignition (on VW, Audi, Skoda it turns on only after turning the key to the START position).
  2. Check the fuel pump fuse (usually F15 or F20, see diagram in manual).
  3. If you have access to the fuel rail, press the nipple (after placing a rag). If fuel sprays out under pressure, the system is OK.
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On vehicles with the system start-stop (for example, BMW EfficientDynamics, Mercedes Eco Start) after a long period of parking, it may take 2-3 starting attempts for the fuel pump to create the necessary pressure in the system.

If the fuel pump does not work:

  • Check fuel pump relay (usually located in the fuse box under the hood or in the passenger compartment).
  • Make sure there is fuel in the tank (the level sensor may be lying).
  • If the pump hums but does not pump, it may be clogged. coarse filter mesh (located in the tank).
⚠️ Attention: If you suspect there is air in the fuel system (for example, after replacing the filter or hoses), DO NOT attempt to crank the starter for long periods of time. This may lead to water hammer in the cylinders if fuel enters abruptly. It is better to bleed the system manually (some cars have a hand pump) or call a tow truck.

5. Electronic systems: immobilizer, ECU and sensors

Modern cars with automatic transmissions are literally “stuffed” with electronics, and a failure in any system can block the engine from starting. Most often the culprits are:

System Symptoms How to check
Immobilizer The "key" or "car with key" light is flashing, the starter does not respond Try the second key. If it starts, the problem is in the first key chip
ECU (Electronic Control Unit) No response to the key, instruments do not work, errors on the panel Check the ECU fuses (usually F10 or F30)
Crankshaft position sensor (CPS) The starter turns, but the engine does not catch, there is no spark Ring with a tester (resistance should be 500-700 Ohms)
Throttle Position Sensor (TPS) The engine starts and immediately stalls, high idle speed Clean contacts or replace sensor

Particularly insidious immobilizer. If it does not recognize the key, the ECU blocks the fuel supply and spark. Signs:

  • 🔑 The immobilizer light flashes or is constantly on.
  • 🔑 The starter turns, but the engine does not start (no fuel/spark).
  • 🔑 A beep sounds 10-15 seconds after the startup attempt.

What to do:

  1. Try the second key (if available).
  2. Check the battery in the key fob (on some cars, for example, Renault, if the battery is dead, the immobilizer blocks the start).
  3. If the key is wet or dirty, wipe it and try again.
  4. On some vehicles (for example, Ford) the procedure for “learning” the key helps: insert the key → turn on the ignition for 10 minutes → turn it off → repeat 3 times.
⚠️ Attention: If the immobilizer has blocked startup due to a glitch in the firmware, DO NOT attempt to “reflash” the ECU yourself. By car VAG groups (Volkswagen, Audi, Skoda) this can lead to complete blocking of the electronics. Contact the service with a diagnostic scanner.

6. Torque converter and automatic transmission oil pump: hidden reasons

If all the previous points did not help, and the car with automatic transmission stubbornly does not start, the problem may lie in torque converter or box oil pump. These malfunctions are less common, but their consequences are more serious:

Signs of problems with the torque converter:

  • 🔄 The engine starts, but immediately stalls (especially at Mercedes 722.6, BMW GA6HP26Z).
  • 🔄 A metallic clanging or vibration is heard when starting up.
  • 🔄 There is an error on the panel P0740 (torque converter lock-up malfunction).

Reasons:

  • 🛢️ Low oil level in automatic transmission — the pump does not create the required pressure.
  • 🔧 Pump blade wear — the oil does not circulate, the clutches do not compress.
  • 🔥 Box overheating — leads to jamming of the torque converter bearings.

How to check:

  1. Check the oil level in the automatic transmission (on some cars, for example, Toyota, this can only be done on a heated box).
  2. If the oil is black and smells like burning, an urgent replacement is required.
  3. Try starting the engine in the selector position N (sometimes with a faulty torque converter, starting in P blocked).

What to do:

  • If the oil is normal, but the problem remains, you need to diagnose the pressure in the automatic transmission system (a pressure gauge and adapter are required).
  • On high mileage vehicles (150,000+ km) replacement may be required oil pump or torque converter.

7. Mechanical problems: timing belt, timing marks, compression

If the starter turns but the engine does not start, there may be serious mechanical problems. Unlike a manual transmission, on cars with automatic transmission these problems are often disguised as electronic failures.

What to check:

  • 🔗 Timing belt/chain - if it is torn or jumped, the engine will not start (on some engines, for example, VW 1.8T, this leads to bending of the valves).
  • 🔧 Timing marks - if they are knocked down, there will be no compression.
  • 💨 Compression in cylinders — if below 8 atmospheres, the engine will not start.
  • 🔥 Cylinder head gasket failure - antifreeze in oil or white smoke from the exhaust pipe.

How to diagnose:

  1. Remove the timing belt cover and check its integrity (at Honda, Mazda this can be done without special tools).
  2. Unscrew the spark plugs and check the compression (you need a compression gauge).
  3. Inspect the oil on the dipstick - if it looks like “mayonnaise” (emulsion), this is a sign of antifreeze.
⚠️ Attention: On vehicles with the system VVT-i (Toyota, Lexus) or Vanos (BMW) even a slight shift in timing marks can cause the engine to start and immediately stall. In this case, accurate diagnosis using a strobe is required.

8. External factors: weather, fuel, human factor

Sometimes the car does not start not because of a breakdown, but due to external reasons. This is especially true for cars with automatic transmission, which are more sensitive to fuel quality and weather conditions.

Common external causes:

  • ❄️ frost — the fuel has frozen (especially important for diesel engines), the oil in the automatic transmission has thickened.
  • ⛽ Bad fuel — after refueling at a questionable gas station, the car may not start due to water or impurities in the gasoline.
  • 🚗 Human factor — forgot to release the handbrake, it’s on immobilizer alarm, key fob is dead.
  • 🌧️ Moisture — water getting into the distributor, ignition coils or sensor connectors.

What to do:

  • If the temperature outside is below -20°C, try warming up the battery (bring it home for 10-15 minutes) or use starter charger.
  • If you suspect bad fuel, drain it from the tank and flush the fuel system.
  • Check if the alarm is activated in the "immobilizer" mode (on some models, for example, StarLine, this blocks the launch).

On vehicles with direct injection (FSI, TSI, GDI) bad fuel can lead to failure high pressure fuel pump. Symptoms: the engine starts and immediately stalls, or does not start at all, although the starter turns.

Frequently asked questions about starting cars with automatic transmission

Is it possible to start a car with an automatic transmission using a pushrod?

Technically possible, but highly not recommended. Unlike mechanics, in an automatic transmission there is no rigid connection between the engine and the wheels, therefore:

  • Risk of damage torque converter or planetary mechanism.
  • You need a speed of at least 30-40 km/h (difficult to achieve when pushing).
  • On most modern machines (for example, Audi A6 C7, BMW F30) electronics blocks such a launch.

If there is no alternative, use the "towing" method in neutral (N), but no more than 50 meters and at a speed not exceeding 50 km/h.

Why does a car with automatic transmission start only after several attempts?

This is a typical sign:

  • Air suction in the fuel system (for example, a cracked hose or a leaking filter).
  • Fuel pump wear - it does not immediately create the required pressure.
  • Problems with the crankshaft sensor — The ECU “loses” the signal and blocks the start.
  • Dirty injectors - Fuel is not atomized properly.

On vehicles with the system start-stop (for example, Mercedes E-Class W212) such symptoms may appear due to a discharged battery - the system requires more energy to start.

What to do if a car with an automatic transmission starts and immediately stalls?

This indicates:

  • Faulty idle air control (RHH).
  • clogged catcollector (on cars with Euro-4 and higher).
  • Problems with throttle valve (adjustment required after cleaning).
  • Low fuel pressure (for example, due to a dying fuel pump).

Urgent measures:

  1. Try pressing the gas pedal when starting (if the problem is in the IAC, the engine may hold speed).
  2. Check if it's on Check Engine - if yes, you need diagnostics with a scanner.
Can a faulty automatic transmission prevent the engine from starting?

Yes, but only in a few cases:

  • Torque converter lockup - if it is jammed, the starter will not be able to crank the engine.
  • Faulty automatic transmission oil pump — without pressure, the clutches will not unlock, which can interfere with starting.
  • Electronic errors — if the automatic transmission ECU “sees” a malfunction, it can block the engine from starting (for example, on BMW ZF 8HP).

Usually in such cases the indicator on the dashboard lights up AT or Check Transmission.

How to start a car with an automatic transmission if the battery is dead and there is no access to the “lighting”?

Options:

  • "Crooked starter" - on some machines (for example, old jeeps, Ford) you can crank the engine manually, but this is risky for an automatic transmission.
  • Starter charger - even a small 12V device will help if the battery is not completely discharged.
  • Battery replacement - if there is a spare one, replace it (on many machines this takes 5-10 minutes).
  • Towing - only as a last resort, as described above.

On vehicles with the system Keyless Go (for example, Mercedes, BMW) a dead key fob battery can block starting. In this case, the key must be attached to the steering wheel or inserted into a special slot (see instructions).