The most documented Subaru Forester problem is the Lineartronic continuously variable transmission (CVT) fitted to the 2014–2018 generation, where owners report shuddering, hesitation and delayed engagement, and technicians point to valve-body, solenoid and torque-converter wear. It is a completely different matter from the older EJ25 engine’s head gasket issue in our Subaru Outback head gasket guide: this is a transmission problem on newer cars, not an engine-sealing problem on older ones.
The Most Documented Issue: Lineartronic CVT Wear
Subaru moved the Forester to a CVT for the 2014 model year. A CVT has no fixed gears; a steel chain runs between two cone-shaped pulleys whose width changes to vary the ratio, controlled by a hydraulic valve body. On a share of 2014–2018 Foresters, owners and technicians report shudder when pulling away, hesitation or a delayed response when the throttle is pressed, and in worse cases a transmission that refuses to move or goes into a protective limp mode. The faults most often named are the valve body and its solenoids and the torque converter.
The same family of symptoms is covered, from the other side, in our Nissan Altima CVT guide — CVT trouble is not unique to one manufacturer — and in our guides on late or hesitant engagement and jerking when accelerating.
Subaru has extended CVT coverage on affected vehicles in the past, reportedly to ten years or 100,000 miles for some 2014–2018 cars, and issued service bulletins and software updates. Terms depend on the exact model year, VIN and service history and can change, so ask a Subaru dealer to look up your VIN before agreeing to any CVT repair.
Other Things Worth Knowing
- All-wheel drive needs matched tyres. Tyres of noticeably different wear or size force the drivetrain to work against itself. Keep them matched and rotated — see our tyre rotation guide and uneven tyre wear guide.
- Transmission fluid service matters on a CVT. CVT fluid is specific to the transmission; never substitute conventional automatic fluid. See our transmission fluid service guide.
- A shudder is not always the transmission. Engine misfires and worn engine mounts can feel similar — see our shudders when shifting from park to drive guide.
How to Check If Your Forester Has This
- Notice when it happens. A shudder under light throttle at low speed, or hesitation when pulling away, are the classic descriptions.
- Scan for stored codes — a transmission code such as the ones in our P0700 guide narrows it down. See our OBD-II scanner guide.
- Check for a dashboard warning or limp-mode behaviour — see our car stuck in limp mode guide.
- Ask a dealer to check software updates and service history for your VIN. Fluid level on a sealed CVT is usually checked by a technician; the general idea is in our how to check transmission fluid guide.
Never work under a vehicle supported only by a jack. Use axle stands on firm, level ground, chock the wheels that stay down, and leave the car in gear or Park with the handbrake on. A jack lifts; stands hold.
Possible Fixes
| Issue | Fix | Typical cost |
|---|---|---|
| Software-related shift behaviour | Transmission control software update | $0 – $200 |
| Degraded CVT fluid | CVT fluid service with the correct fluid | $150 – $400 |
| Valve body or solenoid wear | Valve body / solenoid replacement | $1,000 – $2,500 |
| Severe internal wear | Transmission replacement | $4,000 – $7,000 |
Can I Keep Driving With This?
Mild shudder or hesitation is usually something you can drive on for a short time while you arrange an inspection, but it tends to get worse, not better, and continued driving on a failing CVT can turn a valve-body repair into a full replacement. If the car loses drive or enters limp mode, stop as soon as it is safe — see our limp mode guide.
When to See a Mechanic
As soon as you notice shudder or a delay when pulling away, and before any major transmission repair is approved. Mention the model year so the shop can check bulletins. More in our car brands section and transmission section.
Frequently Asked Questions
What is the most common problem with the Subaru Forester?
Shudder, hesitation and delayed engagement from the Lineartronic CVT in 2014–2018 models, linked to valve-body, solenoid and torque-converter wear.
Is this the same as the Subaru Outback head gasket problem?
No. The Outback guide concerns the older EJ25 engine’s head gaskets; the Forester CVT issue is a transmission problem on newer cars.
Did Subaru extend the warranty on the Forester CVT?
Subaru has extended CVT coverage on affected vehicles, reportedly to ten years or 100,000 miles for some 2014–2018 cars. Eligibility depends on the VIN, so ask a dealer.
Can I use any fluid in a Forester CVT?
No. A CVT needs the specific fluid the manufacturer calls for; ordinary automatic transmission fluid is not a substitute.
How much does it cost to fix a Forester CVT?
From a software update or fluid service at a few hundred dollars up to roughly $4,000–$7,000 for a replacement transmission, which is why checking for coverage first matters.
