Automatic gearbox slipping when pulling away: causes and what to do now

You press the accelerator, the engine revs, but the car hardly moves forward. That means the automatic gearbox is slipping. This article explains when higher revs are normal, what the causes are, whether you can still drive and when a fluid change or flush does or does not help.

By the team at Autobedrijf Willemsbrug, RDW-approved APK (MOT) test station since 1979 · Updated 4 November 2026

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The short answer

An automatic gearbox is slipping when the engine revs rise without the car accelerating to match. In an automatic with a torque converter some slip when pulling away is normal, and in a CVT the revs also stay high when you accelerate. Real slipping is often caused by a low fluid level, ageing fluid, a fault in the valves of the mechatronics unit or worn clutches inside the gearbox. Drive no further than necessary, because slipping creates heat and wear, and have the fluid level and the fault memory checked first.

What does it mean when an automatic gearbox slips?

Slipping means the power of the engine is not reaching the wheels properly. You can see it on the rev counter: the needle shoots up, but the speed lags behind. It feels like a slipping clutch in a car with a manual gearbox. Slipping can happen at different moments:

  • When pulling away: the car is slow to get going while the engine revs high.
  • During a gear change: between two gears the revs rise briefly before the next gear takes up the drive.
  • In one gear: when you accelerate at speed, the revs rise without the car going faster.
  • When selecting a gear: when you put the car in D or R, it takes a moment before the gearbox engages.

Also pay attention to when it happens. Is the gearbox cold or warm? Does it slip in all gears or in one? Does it happen going uphill or when towing a trailer? That information helps the mechanic find the cause.

When are higher revs when pulling away normal?

Not every rise in revs is slipping. In two types of automatic, higher revs when pulling away are part of how the gearbox works. You can find out which automatic you have in our article how does an automatic gearbox work.

Gearbox type Normal Not normal
Automatic with a torque converter Some slip when pulling away and changing gear, with slightly higher revs than with a manual gearbox The revs rise at a constant speed, or the gearbox only takes up the drive late after a gear change
CVT When you accelerate, the revs go up and stay there for as long as you keep accelerating The revs rise while the speed no longer increases, or you feel jolts or hear new noises
Dual clutch (DSG) and robotised manual DSG: according to the ANWB, pulling away with a lot of throttle can feel a little jerky. Robotised manual: the drive drops out briefly during a gear change. Slipping while accelerating in a gear. That can point to a worn clutch plate.

Sources: BOVAG (buying a used car with an automatic gearbox) and ANWB (gearbox explained).

According to BOVAG, the Dutch trade association for the motor industry, some slip when pulling away and changing gear is normal in an automatic with a torque converter. At speed a bridging clutch, the lock-up, closes, and then there is no more slip. In a CVT, according to the ANWB, the Dutch motoring organisation, the engine revs high as soon as you accelerate and keeps doing so for as long as you keep accelerating. According to BOVAG, that monotonous sound is normal. In a robotised manual and a dual-clutch gearbox, BOVAG says there should be no slip while you accelerate in a gear.

What causes an automatic gearbox to slip?

In an automatic with a torque converter or a wet DSG, the cause often lies with the fluid or with the parts that control the fluid. In those gearboxes the fluid transmits power and the clutches inside the gearbox are operated by fluid pressure. These are the best-known causes, from minor to serious:

  • Low fluid level: the Kia owner’s manual states that a low automatic transmission fluid level causes slipping during gear changes. A low level points to fluid loss, for example through a leak.
  • Ageing fluid: fluid loses its properties through heat and time. According to TopGear (September 2026), this happens gradually, and the gearbox can shift noticeably more smoothly after the fluid has been replaced.
  • Mechatronics unit or valve body: according to gearbox maker ZF, pressure control valves in the mechatronics unit control the engaging and disengaging of the clutches and brakes in the gearbox. If those valves fail, ZF says the complaints range from gears that engage badly to gears that no longer engage at all.
  • Worn clutches inside the gearbox: an automatic has multi-plate clutches inside that are engaged by fluid pressure. If they are worn, they no longer grip properly. That is wear and calls for a repair or overhaul.
  • Torque converter or lock-up: if the bridging clutch does not close properly, slip remains at speed. You then see higher revs than you are used to in your car.
  • Worn clutch plate: in a DSG with a dry clutch and in a robotised manual, BOVAG says slipping points to a worn clutch plate.

Slipping often comes together with other signs, such as jerks when changing gear or a message on the dashboard. Our article on recognising automatic gearbox problems explains which signs belong together.

How is this different from a slipping clutch in a manual or a Dualogic?

A robotised manual such as the Dualogic and a dry DSG have a dry clutch between the engine and the gearbox, as a manual gearbox does. If it slips, the clutch plate is usually worn. You solve that with a new clutch, not with fluid. You can read more on our page about clutch replacement.

We do not flush a robotised manual such as the Dualogic in the Fiat 500, because flushing does not help there. A diagnosis is possible. With Ford’s dry Powershift, fitted to the Fiesta and the petrol Focus among others, flushing is not the solution either. There, the complaints are usually in the clutch or the control system. We make a diagnosis first, and you hear in advance what is needed and what it costs. Our article on Ford Powershift problems explains the difference between the dry and the wet version.

Not sure which gearbox your car has? Call us with your registration number. We will look up which transmission is fitted, so you know whether the problem is the clutch, the fluid or something else.

Can you keep driving with an automatic gearbox that slips?

Do not drive further than necessary with a slipping automatic. When the gearbox slips, the clutches rub against each other without gripping properly. That creates heat, and heat puts strain on the fluid and the parts of the gearbox. What starts as a fluid problem can turn into damage inside the gearbox.

The difference in cost is large. According to TopGear (September 2026), changing the transmission fluid with the filter costs € 350 to € 600 on average. According to the same article, a repair or overhaul can easily run into thousands of euros, and according to TopGear even a used automatic gearbox in good condition costs around € 1,500.

Is there also a message on the dashboard, or has the gearbox stopped changing gear? Then it may be in limp mode. Our article on an automatic gearbox in limp mode explains what to do.

What can you check yourself?

There are a few things you can check before you call. They help the mechanic find the cause faster.

  1. Look for fluid stains on the ground where you usually park.
  2. Write down when the gearbox slips: cold or warm, when pulling away, when changing gear or at speed, and in which gear.
  3. Check whether there is a message or warning light on the dashboard and write down the text.
  4. Check the service book or invoices to see when the automatic transmission fluid was last changed.
  5. Many modern automatics have no dipstick. If your car does have one, follow the owner’s manual. Kia, for example, specifies checking the level at a fluid temperature of 70 to 80 °C, with the engine idling and the selector lever in N.

Do not top up the fluid yourself without the right specification. According to the same Kia owner’s manual, too much fluid can cause foaming and faults, and fluid that is not specified can damage the gearbox.

Does a flush help with a slipping automatic gearbox?

A flush only helps if the fluid is the cause. If the fluid level is correct and the fluid is old or contaminated, fresh fluid can reduce the problems caused by ageing fluid. Flushing is maintenance, not a repair. It does not fix worn clutches, a leak or an electronic fault.

TopGear writes that, very occasionally, a garage advises against changing the fluid in an old gearbox with a very high mileage, because such a gearbox is already vulnerable and flushing could then cause damage. That is why we start with an investigation. This is how it works with us:

  1. Intake: you tell us when the gearbox slips. Using the registration number, we look up your gearbox type and the specified fluid.
  2. Test drive: the mechanic drives the car and pays attention to the moment, the gear and the temperature at which the gearbox slips.
  3. Reading the fault memory: where possible, we read the gearbox control unit for fault codes.
  4. Fluid level and fluid: we check the fluid level with the car level and at the specified temperature, following the gearbox manufacturer’s procedure, and assess the fluid. We also look for leaks.
  5. Advice: you hear whether a flush or fluid change makes sense, or whether something else is needed, and what it costs. We only carry out extra work once you have agreed.

You can read how the treatment itself works on our page about automatic gearbox flushing. You receive a quote in advance based on your registration number. Call us on +31 10 479 00 00.

Frequently asked questions

Can an automatic gearbox slip because of low fluid?

Yes. A low automatic transmission fluid level can cause slipping during gear changes. The Kia owner’s manual, among others, says so. A low level points to fluid loss, so have the cause of that investigated too.

Is it normal for a CVT to rev high when pulling away?

Yes. In a CVT the revs go up when you accelerate and stay there for as long as you keep accelerating. That is part of the technology. It only becomes suspicious if the revs rise while the speed no longer increases, or if you notice jolts or new noises.

Should you have the automatic checked if it only slips when it is cold?

Yes. Even if it only happens when the gearbox is cold, slipping is a reason to have the gearbox checked. It can be an early sign of a low fluid level or ageing fluid. The sooner the cause is known, the smaller the risk of damage.

Will an additive in the transmission fluid stop the slipping?

No. A product from a bottle does not repair worn clutches or faulty valves. In an automatic, only use fluids and products that are approved for your gearbox. Have the cause of the slipping established first.

How much does it cost to repair a slipping automatic gearbox?

That depends on the cause. According to TopGear (September 2026), changing the fluid with the filter costs € 350 to € 600 on average. An overhaul runs into thousands of euros, according to TopGear. After the investigation you hear what is needed and what it costs.

Can a slipping automatic gearbox be put right?

Yes. In many cases it can, but that depends on the cause. A low fluid level due to a leak, or ageing fluid, can often be put right. Worn clutches inside the gearbox need a repair or overhaul. The sooner you have the gearbox examined, the better the chance of a straightforward solution.

Is your automatic gearbox slipping?

Call us with your registration number and tell us when the gearbox slips. We look for the cause and tell you in advance what it costs.

You will find us at Boterdiep 11 in Rotterdam-IJsselmonde, close to Stadion Feijenoord (De Kuip). We work by appointment. For a quick question or check you can walk in without an appointment.

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