Why proper automatic starting is important for transmission longevity

An automatic transmission (automatic transmission) requires more delicate handling than a manual transmission, especially when starting the engine. Incorrect actions can lead to accelerated wear of the torque converter, failure of solenoids or even blocking of the selector. For example, trying to start the car in D (Drive) instead P (Parking) creates excess load on the transmission shafts, which over time leads to expensive repairs.

Modern automatic transmissions (including ZF 8HP, Aisin A760 or DCT from Volkswagen) are equipped with electronic control units that record errors when starting incorrectly. These errors can affect the smoothness of switching and even block the box in emergency mode. Therefore, knowing the correct sequence of actions is not a whim, but a necessity to preserve the resource of the unit.

Particularly critical cold start in winterwhen the oil in the box thickens. At this moment, even a slight load on the transmission (for example, the switched on mode N instead of P) may cause microslip of clutches, which reduces their service life by 15–20%. Next, we will look at step-by-step instructions that will help you avoid these problems.

Preparing to start: what to do before turning the key

Before inserting the key into the ignition, there are a few things you need to do. This applies to both new cars (for example, Toyota Camry 2023), and used models with mileage:

  • 🔑 Make sure the automatic transmission selector is in the P (Parking). On some models (for example, Hyundai Santa Fe) it is allowed to start in the mode N (Neutral), but this is risky when parking on a slope.
  • 🚗 Check that the brake pedal is pressed all the way. On many vehicles (including Ford Explorer and Kia Sorento) the ignition lock is activated if the brake is not applied.
  • 🔋 Turn off all energy consumers: headlights, air conditioning, heated seats. This will reduce the load on the battery, especially important for diesel engines (e.g. BMW 320d).
  • 📱 If your car has an alarm system with auto start (for example, StarLine A93), make sure it is deactivated. Trying to start the car while autostart is running may result in an immobilizer conflict.

On vehicles with a button Start/Stop (for example, Mercedes-Benz E-Class or Lexus RX) the algorithm is slightly different: first press the brake pedal, then briefly press the button without holding it down. If the indicator on the dashboard flashes yellow, it means that the system did not recognize the key or there is an immobilizer error.

📊 What type of gearbox do you have?
Mechanics
Automatic (torque converter)
Robot (DCT)
CVT (CVT)
I don't know

Step-by-step instructions: how to start a car automatically

Follow this sequence to avoid mistakes. The instructions are universal for most automatic transmissions, including 6-speed (for example, GM 6L80) and 9-speed (for example, ZF 9HP):

  1. Insert the key into the ignition (or make sure the wireless key is in the interior for keyless systems).
  2. Press the brake pedal all the way down and hold it. This is a prerequisite for unlocking the selector on most models.
  3. Check selector position: it must be in mode P. If the car had to be pushed or towed, the selector could move to N.
  4. Turn the key to position ON (or click the button Start without retention). Wait until all indicators on the instrument panel go out (usually 2-3 seconds).
  5. Start the engine:
    • For the key: turn clockwise until it stops.
    • For the button: hold it for 1-2 seconds (on some models, e.g. Nissan Qashqai, requires pressing without holding).
  • After launch continue to hold the brake for another 5-10 seconds until the engine reaches a stable speed (especially important for turbocharged engines, for example, 1.4 TSI).

    • Selector in P mode|Brake pedal pressed|All power consumers are turned off|The key is in the ignition (or in the passenger compartment for keyless)-->

    If the engine does not start the first time, wait 10-15 seconds before trying again. This time is necessary for the starter to cool down (especially important for diesel engines, for example, 2.0 TDI from Volkswagen).

    ⚠️ Attention: On some vehicles (for example, Chrysler Pacifica or Jeep Grand Cherokee) when restarted within 30 seconds, the starter lock may be activated. In this case, you will have to remove the key, wait 1 minute and repeat the procedure.

    Features of starting in cold weather: how not to ruin the automatic transmission in winter

    At temperatures below -15°C The oil in the automatic transmission thickens, which increases the risk of damage to the clutches if started incorrectly. Here's what to do:

    • ❄️ Before starting, turn on the low beam for 10–15 seconds. This will warm up the electrolyte in the battery (relevant for lead-acid batteries).
    • 🔥 If the car is equipped with a preheater (for example, Webasto or Hydronic), turn it on 15–20 minutes before starting.
    • 🚗 After starting the engine, let it idle:
      • For gasoline engines: 1–2 minutes.
      • For diesel engines (for example, 3.0 TDV6 from Land Rover): 3–5 minutes.
    • 🔄 Do not start moving immediately after launch. Allow the oil in the box to warm up to operating temperature (on some models, for example, Audi A6, this is shown on the display).

    If the car does not start in cold weather, do not turn the starter for more than 5 seconds in one attempt. Pause 30–60 seconds between attempts. On vehicles with the system Stop/Start (for example, Mazda CX-5) protection may operate if the battery is discharged below 11.8 V.

    What should I do if the selector does not move out of P mode?

    If the automatic transmission lever is locked in position P, the reasons may be as follows:

    1. The brake pedal is not pressed (on most models, the lock is released only when the brake is pressed).

    2. Low battery - Voltage below 10.5V may cause the lockout solenoid to malfunction.

    3. The selector lever position sensor is faulty (for example, on Ford Focus with box PowerShift).

    4. Mechanical damage to the blocker (often occurs after an accident or careless towing).

    To unlock the selector in emergency mode, find a small hole with the inscription under the hood or near the automatic transmission lever Shift Lock Release. Insert a screwdriver or a special key into it (included with the machine) and press while moving the lever.

    Temperature, °C Engine warm-up time Automatic transmission warm-up time Recommendations
    0 to -10 30–60 seconds 1–2 minutes Start moving smoothly, without sudden acceleration.
    -10 to -20 2–3 minutes 3–5 minutes Use a winter fuel additive (eg Liqui Moly Diesel Fliess-Fit for diesel engines).
    -20 to -30 5 minutes 5–7 minutes Check the viscosity of the automatic transmission oil (suitable for frost ATF with index -40).
    Below -30 10 minutes 10+ minutes It is recommended to use a car blanket or heater.

    Common mistakes: what kills an automatic transmission when starting

    Even experienced drivers sometimes make mistakes that shorten the life of the automatic transmission. Here are the most dangerous of them:

    • 🚫 Run in mode D or R. This causes the transmission to jerk and damage the torque converter. On some models (for example, Honda Accord) the protection is triggered, but the risk remains.
    • 🚫 Ignoring selector lock. If the lever does not move out of P, do not use force - this may break the locking mechanism.
    • 🚫 Holding the key in position for a long time Start. If the engine does not start within 3-4 seconds, further rotation of the starter only discharges the battery and overheats the windings.
    • 🚫 Starting from a tug with an automatic transmission. Most automatic transmissions (with the exception of some models with DCT, for example, Porsche PDK) are not intended for push launch. This can lead to destruction of the planetary gears.

    Another common mistake is incomplete heating of the box in winter. Many drivers only warm up the engine, forgetting that the oil in the automatic transmission takes longer to warm up. For example, in Toyota RAV4 with box U760E The temperature difference between the engine and transmission can be up to 20°C, which leads to increased wear.

    ⚠️ Attention: On vehicles with the system Auto Hold (for example, Skoda Octavia or Volkswagen Passat) the brake can be automatically activated after the engine is started. If you do not plan to start driving immediately, disable this function using the button on the panel.

    What to do if the car won't start automatically

    If the engine does not respond to turning the key or pressing a button Start, follow the following algorithm:

    1. Check the battery:
      • Turn on the headlights. If they light dimly or flash, the battery is low.
      • Try to “light” from another car, observing the polarity (+ to +, − to −).
    2. Make sure the selector is in P. On some models (for example, Renault Duster) If the lever position sensor is faulty, the engine will not start.
    3. Check the immobilizer:
      • If the key icon flashes on the dashboard, the system does not recognize the chip.
      • Try using a spare key or reboot the system by removing the key and reinserting it.
  • Diagnose the starter:
    • If you hear a click when you turn the key, but the engine does not turn, the solenoid relay is faulty.
    • If the starter turns, but the engine does not start, check the spark plugs (gasoline) or glow plugs (diesel).

    On vehicles with the system Keyless Go (for example, Mercedes-Benz S-Class) the problem may be a dead key battery. Try moving the key closer to the button Start or insert it into a special slot (if provided).

    💡

    If the car does not start after a long period of parking (for example, after a vacation), check whether the alarm has tripped in the “immobilizer” mode. On some models (for example, Mitsubishi Outlander) To unlock, you need to enter a PIN code through the buttons on the steering wheel.

    Tips for beginners: how to get used to the machine

    If you've previously only driven a manual, switching to an automatic can be challenging. Here are some tips to help you adapt:

    • 👣 Train yourself to always press the brake before starting. It should become a reflex, like fastening your seat belt.
    • 🔄 Don't confuse the pedals. There is no clutch on the automatic, so your left foot must always be on the footrest. The right foot controls the gas and brake.
    • 🚦 Use manual mode (M or +/-) on the descents. This will help prevent your brakes from overheating and give you more control over your speed.
    • 🔋 Monitor the oil level in the automatic transmission. Unlike mechanics, an automatic requires regular checking (every 10–15 thousand km). Use only oil recommended by the manufacturer (for example, Toyota ATF WS for boxes Aisin).

    At first, you can stick a reminder on the dashboard of the sequence of actions: 

    1. Selector in P

    2. Brake applied
    

    3. Ignition ON
    

    4. Starting the engine

    Over time, this algorithm will become automatic.

    💡

    The main rule for beginners: never switch the selector from P or N on D/R without stopping the car completely. This risks breaking the planetary gear in the box.

    FAQ: answers to frequently asked questions

    Is it possible to start a car with an automatic transmission in N (neutral) mode?

    Technically possible, but not recommended. In position N There is no blocking of the output shaft, and if the machine is standing on a slope, it may roll. In addition, on some models (for example, Ford Mustang with box 10R80) in mode N The fuel pump may not work, making starting difficult.

    What happens if you start the car with an automatic transmission in D mode?

    This will lead to a sharp forward jerk, which can damage the torque converter and clutches. On modern cars (for example, BMW X5 with box ZF 8HP) the protection is triggered, but the risk remains. At best, you will feel a strong shock, at worst, the box will go into emergency mode.

    How long does it take to warm up your car automatically in winter?

    Depends on temperature:

    • Before -10°C: 1-2 minutes at idle, then 1-2 minutes at low speed.
    • From -10°C to -20°C: 3–5 minutes of warming up the engine and gearbox.
    • Below -20°C: at least 5–7 minutes, preferably with a preheater.

    The main thing is to wait until the engine speed stabilizes (stops floating).

    Why does the car jerk when changing gears after starting?

    This can be caused by several reasons:

    1. Low level or old oil in the automatic transmission (for example, if the last change was more than 60 thousand km ago).
    2. Malfunction of solenoids (valves) in the valve body. A common problem with boxes GM 6T40/6T45.
    3. Dirty automatic transmission filter (it is recommended to change it every 40–50 thousand km).
    4. Failure in the control unit (diagnosis with a scanner is needed, for example, Launch X431).

    If the jerking only occurs when cold, the problem may be in thick oil - try using a synthetic ATF with improved low-temperature properties.

    Is it possible to tow a car with an automatic if it won't start?

    It is possible, but subject to the rules:

    • The towing speed should not exceed 50 km/h.
    • Distance - no more than 50 km (for gearboxes with a torque converter).
    • The selector must be in position N.
    • The engine must be turned off (so that the hydraulic pump does not work and damage the box).

    For vehicles with variator (CVT) (for example, Nissan X-Trail) towing is strictly not recommended - only a tow truck!