Mitsubishi ASX problems: the CVT gearbox and other known issues

Most Mitsubishi ASX problems we see in our workshop come from the CVT automatic gearbox: judder at low speed, a shudder when pulling away, revs rising while the car barely speeds up, and limp mode once the gearbox gets hot. It usually starts with CVT fluid that stayed in too long. Outside the gearbox, the ASX has a good reputation.

That split view is fair. The ANWB, the Dutch motoring club, calls Mitsubishis very robust and says its Wegenwacht roadside patrol knows of no particular faults on the facelifted ASX of 2019 to 2021. Yet when an ASX does arrive with a complaint, it is often the CVT gearbox that needs attention. Below you can find out which ASX has which gearbox, what the warning signs are, where they come from and what you can do about them.

Which gearbox does your Mitsubishi ASX have?

Not every ASX has the same gearbox, and that decides which problems you can expect. The first generation went on sale in 2010 and came, depending on engine and year, with a manual gearbox, the INVECS-III CVT or a conventional 6-speed automatic. The second generation from 2023 is a different car altogether.

ASX with a manual gearbox

Many ASX models in the Netherlands, such as the 1.6 petrol, have a manual gearbox. If you are searching for Mitsubishi ASX 1.6 problems with a manual car, the CVT story below does not apply to you. The complaints we see on a manual ASX are the classics: a slipping clutch, heavier gear changes or a noisy release bearing.

The Mitsubishi ASX automatic: 2.0 petrol with CVT

The facelifted ASX sold in the Netherlands from 2019 has a 2.0 litre petrol engine (150 hp, the 4B11) and, according to the ANWB, always came with a CVT. A CVT (continuously variable transmission) has no fixed gears. Two adjustable pulleys with a steel push belt between them change the ratio, controlled by oil pressure. Mitsubishi calls its version INVECS-III. The unit comes from Jatco, the same supplier behind many Nissan CVTs, and is known in the trade as the JF011E or, at Mitsubishi, the F1CJA. CarsGuide notes that the ASX’s CVT can mimic six fixed steps, which makes it feel more like a normal automatic. If the symptoms in this article sound familiar, our page on Nissan Qashqai CVT problems will probably sound familiar too.

The new ASX from 2023

The current ASX is built by Renault in Valladolid, Spain, on the CMF-B platform it shares with the Renault Captur. The 1.3 mild hybrid comes with a 6-speed manual or a 7-speed dual-clutch automatic. The full hybrid uses a multi-mode automatic gearbox. There is no CVT in this generation, so its problems are a different subject. In practice, most searches for ASX problems are still about the first generation.

How do you recognise ASX CVT problems?

A failing CVT almost always gives warning signs. These are the ones we see most often on the ASX:

• Judder or jerking at low speed, especially when pulling away or crawling through town.
• A shudder at walking pace, felt as a fine vibration through the floor or the pedal, for example in a car park.
• Revs that rise while the speed lags behind. That is the clearest sign that the push belt is slipping on the pulleys.
• Loss of power or limp mode when the gearbox is hot, often after a long spell in town traffic. Once cooled down, the car drives normally again.
• A whine or hum that rises and falls with engine speed, which points towards the oil pump or the pulley bearings.
• A delay before D or R engages, followed by a clunk.

One thing to know: high, steady revs under hard acceleration are normal for a CVT. There are no gear changes, so the engine holds its revs while the speed builds. That “rubber band” feeling takes getting used to, but it is not a fault. Judder, shudder, whine and limp mode are not normal, and that is the line between getting used to the car and having the gearbox read out.

What causes Mitsubishi ASX gearbox problems?

Most ASX gearbox problems trace back to one chain of events: ageing fluid leads to slip, slip creates heat, and heat damages the belt and pulleys. The valve body is the other usual suspect.

CVT fluid that stays in too long

This is the main cause, on the ASX as on other Jatco CVTs. CVT fluid does more than lubricate. It provides the clamping force with which the pulleys grip the push belt, and it carries heat away. Old fluid loses its friction properties, so the belt starts to slip slightly and the pulley faces slowly wear. Many owners assume the fluid lasts for life. Mitsubishi’s own service schedule lists a CVT fluid change, and we explain on our page about CVT maintenance why it matters.

Heat from short trips and slow traffic

A CVT produces a lot of heat, and at low speed there is little airflow to cool it. An ASX that mostly does short trips and stop-start traffic, on a ring road or in a city like Utrecht, works its gearbox harder than a car that cruises on the motorway. Repeated overheating speeds up fluid ageing, which causes more slip and more heat. That is how a maintenance issue gradually becomes damage.

Wear on the push belt and pulleys

Once the belt has slipped for a while, the pulley faces get marked. They become rough or grooved, and from that point fresh fluid no longer solves the problem. This is the stage where an overhaul or an exchange gearbox comes into the picture.

Valve body and ratio control

The ratio is set hydraulically through the valve body. When valves and their bores wear, the actual oil pressure no longer matches what the control unit expects. Transmission parts maker Sonnax lists the results for this Jatco family (including the Mitsubishi F1CJA): chatter and noise on acceleration, no ratio change, push belt slippage and faster belt and pulley wear. You see it as erratic, illogical behaviour and fault codes that only make sense with brand-level diagnostic equipment.

Is the Mitsubishi ASX reliable?

Yes, the Mitsubishi ASX is generally a reliable car, with the CVT as its main weak spot when maintenance falls behind. The ANWB rates Mitsubishis as robust and its roadside patrol reports no known faults on the 2019 to 2021 ASX. Its review does mention a noisy engine, plenty of tyre noise and a vague feel around the straight-ahead steering position, but those are characteristics, not defects.

For complaints outside the gearbox, such as brakes, engine or electrics, a general garage is the right first stop. If you are comparing gearbox complaints across brands, our hub on automatic gearbox problems by brand gives an overview.

How to protect the CVT in your ASX

Have the CVT fluid changed on time, and use fluid that meets Mitsubishi’s specification exactly. Mitsubishi’s service schedule for the 2022 ASX (Australian market) lists the following:

Mitsubishi counts towing, short trips in cold weather, long idling, driving in cold regions and heavy city traffic in high temperatures as severe use. Many Dutch commutes with short trips in winter fall into that category. Check your own service book for your year and market. A CVT is very sensitive to the friction properties of its fluid: a general automatic transmission fluid or a “universal” CVT fluid can damage the gearbox in a short time. Repco, for example, lists Mitsubishi DiaQueen CVT Fluid J4 for the ASX.

Also, do not keep driving in limp mode. When the ASX cuts power, it is protecting its own push belt. Driving on means more slip on surfaces that are already too hot, and that is exactly how a fluid change turns into an overhaul. Pull over, let the car cool down and have the gearbox read out before you drive on.

What ATR does with an ASX that has CVT complaints

At ATR Transmissies we read the gearbox out with brand-level diagnostic equipment, not just a generic OBD2 scanner. On a Jatco CVT the useful information sits in the live data: fluid temperature, the requested versus actual ratio, pressures and control currents while driving. That shows us whether the gearbox is slipping, whether it is protecting itself because of heat, and where the cause lies.

Then comes an honest choice. Can a correct fluid change solve it? Is it the valve body? Or is an overhaul or an exchange gearbox the more sensible route? We would rather repair what is actually worn than replace a whole gearbox by default, and we also tell you plainly when an overhaul is no longer worth it. You decide only after the diagnosis. Not sure what your ASX is telling you? Find out what your symptom could mean.

Are you a garage with an ASX on the lift? With ATR Remote we can carry out the diagnosis at a distance, so you do not have to transport the car first. Read more on our ATR Remote page.

What does fixing an ASX CVT cost?

The cost depends heavily on the situation. A fluid change on a gearbox that is still healthy is a completely different job from a valve body repair, and both are a world away from an overhaul or an exchange gearbox. That is why the diagnosis comes first: only when we know the state of the belt and pulleys can we give a realistic figure. Contact us for a price indication based on your registration number and complaint.

Frequently asked questions about Mitsubishi ASX problems

What is the most common problem with the Mitsubishi ASX?

On automatic versions, the CVT gearbox: judder at low speed, belt slip that shows as rising revs, whine and limp mode when hot. These faults usually start with CVT fluid that was not changed on time. Manual versions mainly show normal clutch wear.

Is the Mitsubishi ASX a reliable car?

Yes. The ANWB rates Mitsubishis as very robust, and its roadside patrol reports no known faults on the 2019 to 2021 ASX. The main condition is that a CVT version gets its fluid changes on time. A neglected CVT is by far the most expensive problem on this model.

Does the Mitsubishi ASX have a timing belt or chain?

The 2.0 petrol engine (4B11) uses a timing chain, which has no fixed replacement interval. Other engines in the ASX range differ by engine code. If you are unsure, have it checked with your registration number before you book a belt change you may not need.

Is the high revving of my ASX automatic normal?

Under hard acceleration, yes. A CVT has no gear changes, so the revs stay up while the speed builds. If the speed clearly lags behind the revs, or you also feel judder or hear whine, that is not normal behaviour but a reason to have the gearbox read out.

How often should the CVT fluid in a Mitsubishi ASX be changed?

Mitsubishi’s schedule for the 2022 ASX lists every 90,000 km in normal use and every 40,000 km in severe use, which includes towing and short trips in cold weather. Check the service book for your year and market, and use fluid that meets Mitsubishi’s CVT specification.

What is the best year for a Mitsubishi ASX?

No year is free of CVT risk, so the service history matters more than the year. For a CVT version, look for proof of CVT fluid changes. If you prefer to avoid the CVT altogether, a manual ASX or the 2023 generation with a different gearbox is the alternative.

Can a CVT fluid change fix judder in my ASX?

Sometimes. If the judder comes from old fluid and the pulleys are still undamaged, fresh fluid of the right specification can help. If the belt and pulleys are already marked, or the valve body is worn, a fluid change will not fix it. A diagnosis first tells you which case you are in.

Have your ASX checked

Not sure whether your ASX shows normal CVT behaviour or the start of damage? Have the gearbox read out before the complaint gets worse, so the repair stays limited. Book your car in with your registration number and complaint, or bring it to our workshop at Aardvletterweg 7 in Montfoort.