Toyota automatic gearbox problems: what goes wrong, by gearbox type

Toyota automatic gearbox problems depend on which of four systems your car has. Toyota uses a belt-driven CVT (Multidrive S or S-CVT), the hybrid e-CVT, an automated manual (MMT or x-shift) and a conventional torque converter automatic. Most complaints come from the CVT and the automated manual. The hybrid e-CVT rarely fails mechanically; its warnings usually start elsewhere.

That difference matters before anyone touches your car. A droning engine in a Yaris Hybrid at full throttle is normal behaviour, while the same noise from a petrol Auris with a CVT can mean belt or bearing wear. An Aygo that drops into neutral has an actuator, clutch or voltage problem, not a “broken automatic”. If nobody checks which system you have, you can end up paying for the wrong repair.

On this page you will learn how to tell the four systems apart, which symptoms and causes belong to each one, what you can check yourself and when a targeted repair is enough. ATR Transmissies is an independent transmission specialist in Montfoort, in the Dutch province of Utrecht. We have been solving Toyota automatic complaints for years, such as the RAV4 shift solenoid codes we describe below, and our rule is simple: measure first, then repair only what is actually broken.

Which automatic gearbox does your Toyota have?

The badge, the model and the year tell you most. A “Hybrid” badge means the e-CVT. A small petrol Toyota with an automatic is either a CVT or an automated manual. Older and larger models often have a conventional automatic.

Not sure which one you have? Our guide on how to tell which automatic gearbox you have explains where to look. A specialist can also confirm the exact gearbox code by reading out the car.

Multidrive S and S-CVT: the belt-driven CVT

Toyota’s Multidrive S is a real CVT: a steel push belt runs between two variable pulleys, combined with a torque converter and a lock-up clutch for pulling away. It has a manual mode that simulates seven steps, but there are no fixed gears inside. The newer S-CVT in the Aygo X works on the same belt and pulley principle; the “S” stands for small.

Because the belt and pulleys transmit all the power, this is the Toyota system that suffers the familiar CVT wear.

CVT symptoms

• Shudder or vibration when you pull away or accelerate gently.
• A whining or humming noise that gets louder over time.
• Engine revs that rise while the car hardly accelerates, as if the gearbox slips.
• Hesitation or lag when you press the accelerator.
• A burning smell, a warning light or limp mode after a hot drive.

What causes CVT faults?

• Belt slip and wear. Shudder on acceleration usually comes from belt slip, caused by degraded fluid or wear of the belt or pulleys.
• Pulley or bearing wear. A whine that gets louder usually points to worn pulleys or bearings.
• Hydraulic pressure or solenoid faults. The pulleys are clamped by oil pressure, so a pressure problem or a sticking solenoid gives hesitation and slip.
• Old or incorrect fluid. CVT fluid does more than lubricate: it carries the clamping force. Old fluid, or the wrong specification, speeds up wear.
• Heat. Overheating breaks the fluid down faster and can put the gearbox into limp mode.

Clean fluid of the right specification is the cheapest protection you can give a CVT. Read more about CVT maintenance.

The hybrid e-CVT: rarely the gearbox itself

The Toyota hybrid e-CVT has no belt, no pulleys and no clutch. It is a planetary gear set, the “power split device”, that connects the petrol engine to two electric motor-generators (MG1 and MG2). The electronics vary the speeds of the motors, and that creates the stepless feeling. With so few wearing parts, the gearbox itself rarely fails the way a belt CVT does.

The same principle is used by other makers; we explain it in our article on the Ford hybrid HF35 power split transmission.

What is normal in a Toyota hybrid

• A steady drone under full throttle. When you accelerate hard, the system holds the engine at high revs while the speed builds up. That sounds different from a conventional automatic, but it is not a fault.
• The engine starting and stopping on its own. The system decides when the petrol engine runs.
• Reduced performance after a long, steep climb. On a sustained climb the hybrid battery can run low, and performance drops until it has recharged.

What a hybrid warning usually means

A “Check Hybrid System” message, reduced power or limp mode in a Toyota hybrid usually comes from the hybrid system around the gearbox: the hybrid battery, the inverter, a sensor, or the inverter’s own cooling circuit. The inverter has a separate coolant loop with its own electric pump. When that pump fails, the hybrid control unit typically stores code P0A93 (inverter cooling system performance) and shows the warning.

So before anyone says “the gearbox has gone”, the whole hybrid system has to be read out. A mechanical fault in the power split device itself, such as a bearing noise or a grinding sound, is possible but much less common.

MMT and x-shift: Toyota’s automated manual

The automatic in many older Aygos, Yarises and Aurises is not a real automatic but an MMT (MultiMode transmission): a normal manual gearbox in which two electric actuators operate the clutch and change gear. The second-generation Aygo has the x-shift, which works on the same automated manual principle. Technically this is a semi-automatic gearbox.

A short pause in pulling power at each shift is normal for an MMT. It feels like a driver changing gear with a manual. The faults below are not normal.

MMT symptoms

• A flashing N on the gear display.
• The car drops into neutral, or will not leave neutral.
• The gearbox slips out of gear while driving.
• A gearbox warning light.
• Jerky or slow shifts, or difficulty pulling away.
• In the worst case, a car that will not drive at all.

Actuator, clutch or battery?

An MMT complaint has three usual suspects. The clutch actuator and the gear actuator can fail from stop-start driving, heat, moisture or dirt at the connectors. The clutch itself wears like any manual clutch, and as it wears the system has to compensate. And low battery voltage can make the actuators misbehave.

Fault codes help to tell them apart: codes from P0900 to P0903 point to the clutch actuator, and P0904 to P0909 to the gear selection. A dropping-into-neutral symptom can come from either actuator, so the codes are a better guide than the symptom. Read more about fault code P0900. After an actuator or clutch replacement, the clutch touch point has to be relearned with diagnostic equipment, or the problem comes back.

Conventional automatics: RAV4, Avensis and older models

Toyota’s conventional automatics with a torque converter are durable, but not faultless. You find them in the RAV4 from 2001 to 2012 (U140F, U241E and the five-speed U151E), the Avensis from 2002 to 2009, the Previa and older Camrys.

A typical case from our own workshop is the RAV4 from 2001 to 2003 with the U140F or U241E. The complaints: a jolt when you select reverse, harsh shifts when changing up, and sometimes the wrong gear. The fault memory usually shows P0755 (shift solenoid B), often together with P0750, P0753, P0758 or P1760 (line pressure control solenoid). We describe this case in our article on fault codes P0755, P0750, P0753, P0758 and P1760 on the Toyota RAV4.

A solenoid code does not automatically mean a new solenoid, let alone a new gearbox. It can have several causes. We start with the condition and level of the fluid, and only when those are in order do we measure the solenoids and wiring. That way the repair is aimed at the actual cause.

Other complaints on these gearboxes are slipping, delayed engagement when you select D or R, and an automatic gearbox that does not shift properly. On lower-mileage cars the cause is often the fluid; on higher-mileage cars it can be solenoid wear, the valve body or worn clutch packs.

Why we measure before we replace

The same symptom has different causes in each Toyota system, so we measure before anything is replaced. A hybrid warning can be the battery, the inverter or its cooling pump. An Aygo dropping into neutral can be the clutch actuator, the gear actuator, the clutch or the battery. A RAV4 solenoid code can be fluid, wiring or the solenoid itself. Only one of those needs the part the symptom seems to point at.

That is why we disagree with the advice you often hear: “the gearbox is broken, it has to come out.” In our experience the fault is usually in one part or one circuit, and a targeted repair fixes it.

What a targeted repair looks like

• Read out and record. We read the fault memory of the gearbox and, on a hybrid, of the hybrid system as well.
• Check the basics. Fluid condition and level, battery voltage, connectors and wiring.
• Test drive. Cold and warm, pulling away, in traffic and at speed, to feel when the complaint happens.
• Measure. Solenoids, sensors and actuators are measured, not guessed.
• Repair only what is needed. A solenoid, an actuator, a clutch, a fluid change or a software relearn. An overhaul only when the measurements show internal wear.
• Relearn and final check. After an MMT clutch or actuator job we relearn the touch point, then test drive again.

ATR makes some of its own parts and does its own research into materials and tolerances, which is why we can often repair a part instead of replacing a complete unit.

What can you do yourself right now?

Do not keep driving with a gearbox that slips, jerks or drops into neutral; the damage adds up, and a slipping CVT belt or MMT clutch gets worse quickly. What does help:

• Write down when it happens: cold or warm, pulling away, in traffic, uphill or at speed.
• Check the battery on an MMT or x-shift car. Low voltage can cause gearbox faults. A battery that struggles to start the car is a clue.
• Know what is normal. A hybrid that drones under full throttle, or an MMT that pauses at each shift, is working as designed.
• Check the service history for gearbox fluid changes, especially on a CVT or a conventional automatic.
• Have it read out before parts are replaced. Our overview of transmission fault codes explains the most common codes, such as P0750.
• Before your APK (MOT), have a gearbox warning light looked at. A fault that is caught early is usually easier to repair.

Find out what your symptom could mean in our guide to gearbox failure symptoms.

Repair, overhaul or replace: what decides the cost?

The cost of a Toyota gearbox repair depends on the system and on what is actually wrong. A battery, a solenoid or an actuator is a very different job from a CVT overhaul. We do not publish prices, because they only mean something once the cause is known.

The factors that decide the cost:

• The system: belt CVT, hybrid e-CVT, MMT or x-shift, or a conventional automatic.
• The cause: fluid, a solenoid, an actuator, the clutch, a sensor, wiring or internal wear.
• Whether the gearbox has to come out for the repair.
• Follow-on damage: driving on with a slipping belt or clutch damages other parts.
• Calibration: an MMT clutch or actuator job always needs a relearn.

Contact us for a price indication based on your registration number and complaint. Our page on gearbox overhaul costs explains how such a price is built up.

How ATR Transmissies helps with your Toyota

We understand that you want certainty about what is wrong with your car before you spend money on a repair. That is why the diagnosis comes first.

1. Book your car in. Send us your registration number, the complaint and any fault codes.
2. Independent basic diagnosis. We read out the car, test drive it and tell you what we found and what it takes to fix it.
3. Drive with confidence. Only after your approval do we repair, test and carry out a final check.

Are you a garage with a Toyota gearbox complaint you cannot pin down? With ATR Remote we help with diagnosis at a distance, so you understand the complaint before the gearbox comes out. More about our workshop and way of working is on our about ATR page (in Dutch).

Frequently asked questions about Toyota automatic gearbox problems

Which Toyotas have transmission problems?

The complaints we see most come from two systems: the belt CVT (Multidrive S) in petrol models such as the Yaris, Auris, Verso and C-HR 1.2 Turbo, and the MMT or x-shift automated manual in the Aygo, Yaris, Auris and Corolla Verso. Older RAV4 and Avensis automatics can suffer from solenoid faults. The hybrid e-CVT rarely fails itself.

How reliable is the Toyota automatic transmission?

It depends on the system. The hybrid e-CVT has few wearing parts and is generally very reliable. Toyota’s conventional automatics are durable when the fluid is maintained. The belt CVT and the automated manual are more sensitive: the CVT to fluid condition and heat, the MMT to clutch wear, actuators and battery voltage.

Does Toyota have CVT problems?

Toyota’s belt CVTs can suffer the usual CVT complaints: shudder, whine, slip and hesitation, mostly caused by fluid condition and belt or pulley wear. The hybrid e-CVT is a different design without a belt and does not have those problems. So “Toyota CVT problems” usually means a petrol Toyota with Multidrive S.

How long will a Toyota CVT transmission last?

There is no fixed number of kilometres. Lifespan depends on fluid maintenance, driving style and heat. A CVT that gets clean fluid of the right specification on time, and is not driven hard while it slips, lasts much longer than one that is neglected. A shudder or whine is the moment to have it checked.

Which Toyotas do not use a CVT transmission?

Toyota models with a conventional automatic (older RAV4, Avensis, Previa, Camry and larger SUVs and pick-ups) and those with an MMT or x-shift automated manual (older Aygo, Yaris, Auris, Corolla Verso) have no CVT. The hybrids have an e-CVT, which is a planetary gear set, not a belt CVT.

What are the symptoms of a faulty automatic gearbox?

Typical signs are slipping (revs rising without acceleration), jerks or a jolt when engaging a gear, delayed engagement, whining or grinding noises, a burning smell, a warning light and limp mode. On an MMT, a flashing N and dropping into neutral are the classic signs. One symptom does not mean the gearbox is finished.

Is the drone of my Toyota hybrid at full throttle a fault?

No, that is normal e-CVT behaviour. Under full throttle the system holds the engine at high revs while the speed builds up. It sounds different from a conventional automatic, but it is not a fault. A new grinding noise or a warning in the dashboard is a reason to have it checked.

Is the automatic Toyota Aygo a real automatic?

The first-generation Aygo automatic is an MMT and the second generation has the x-shift: both are manual gearboxes with automated clutch and gear changes, not real automatics. The Aygo X (from 2022) is available with the S-CVT, which is a belt CVT. Each needs a different diagnosis.

Should I change the fluid in my Toyota CVT?

Yes. In a belt CVT the fluid carries the clamping force between belt and pulleys, so its condition directly affects wear. Have it changed with the specified fluid, following Toyota’s schedule or sooner after heavy use. The wrong fluid can cause damage instead of preventing it.

Can a Toyota MMT be repaired instead of replaced?

Usually, yes. Most MMT faults sit in the clutch actuator, the gear actuator, the clutch or the battery and wiring. A failed actuator can often be repaired, and a worn clutch can be replaced on its own. After the repair, the clutch touch point has to be relearned.

How much does it cost to fix a Toyota automatic gearbox?

It depends on the system and the cause. A battery, a solenoid, an actuator, a clutch and a CVT overhaul are very different jobs. After the diagnosis you know what is needed. Contact us for a price indication based on your registration number and complaint.

Know the system, then diagnose

Toyota automatic gearbox problems come down to the system in your car: the belt CVT with shudder and whine, the hybrid e-CVT that rarely fails itself, the MMT and x-shift with actuator and clutch faults, and the conventional automatics with solenoid and fluid problems. Know which one you have, check the basics such as fluid and battery, and have the car read out before parts are replaced.

Want certainty about your Toyota? Book your car in at ATR Transmissies in Montfoort. We read out, measure what is going on and tell you honestly whether a targeted repair is enough.