I’ll never forget the first Buick Encore that rolled into my shop with a transmission complaint, the owner said it felt like someone rear‑ended them every time it shifted into third gear. The pattern holds more often than not. What this means is that 2019 Encore needed a full rebuild, $4,700 later — they were back on the road, but the damage was already done to their wallet.
You might be reading this. Because your own Encore is acting up. Maybe it’s a tough 2‑3 shift, a sudden loss of power on the highway. Or a dashboard lit up like a Christmas tree. The transmission in these little SUVs is a known headache.
Most of the expensive failures can be spotted early if you pay attention.
TL; DR
- The Buick Encore uses a GM 6T40 six‑speed transmission (standard), while the Encore GX offers a CVT (FWD) or a 9‑speed automatic (AWD) — each carries its own set of risks.
- Common symptoms include harsh 2‑3 gear changes, slipping under load, delayed engagement, and a rattling noise at idle that signals a failing torque converter.
- A replacement costs $6,003 to $6,525, so dumping the DEXRON‑VI fluid every 45,000 miles is astronomically cheaper than waiting for a catastrophic failure.
Key Point
- Changing the transmission fluid every 45,000 miles prevents the wave plate and clutch drum failures that kill the 6T40 — ignore the “lifetime fluid” marketing.
- A software‑driven cleaning program can cycle the solenoids and clear debris without pulling the transmission apart — ask your mechanic if they have a capable scan tool.
- If you feel a sudden slip or a harsh bang during acceleration, stop driving to protect the internal seals from heat damage that leads to a $6,000+ bill.
- The 9‑speed in the Encore GX AWD feels more dependable than the CVT, but it still needs the same fluid discipline.
What Transmission Does the Buick Encore Use?
The Buick Encore family relies on three different transmissions depending on the model, year, and drivetrain. The standard Encore gets the Hydra‑Matic 6T40 six‑speed automatic, while the Encore GX splits between a CVT for front‑wheel‑drive models and a 9T45 nine‑speed automatic for all‑wheel‑drive variants. Knowing which one you've is Step 1 to understanding the failures you might face.
Right now, this trio of transmissions makes shopping for a used Encore confusing. The 6T40 has been around for over a decade and makes it clear its age with (and that implies quite a bit) known weak points. The CVT delivers smoother fuel economy but can’t match the durability of the 9‑speed.
| Model/Year | Drivetrain | Transmission | Notable Problems |
|---|---|---|---|
| Buick Encore (all years) | FWD / AWD | 6T40 6‑speed | Harsh 2‑3 shift, slipping, TEHCM failure |
| Buick Encore GX (2020+) | FWD | CVT (chain‑type) | Jerky takeoffs, overheating under load |
| Buick Encore GX (2020+) | AWD | 9T45 9‑speed | Occasional harsh 4‑5 shift, rare software glitches |
If you’re holding a service record that says “DEXRON‑VI only,” you’ve got one of the GM‑sourced automatics. The CVT takes advantage of a different fluid, which matters when you’re pricing out maintenance.
Signs Your Buick Encore Transmission Is Failing
An Encore transmission rarely fails without warning. The first hints are usually a noticeable jerk when the transmission shifts from second to third gear, a delay when you move from Park to Drive, or a rattling sound at idle that disappears when you press the gas. Catching these early can save you from a $6,000 replacement.
Still, of course, some symptoms mimic engine problems. Or bad motor mounts, so diagnosing accurately is everything. I’ve had clients convinced their engine was misfiring. When the real culprit was a slipping 6T40.
Why does my Encore jerk so hard when shifting?
The 2‑3 upshift jerk is the 6T40’s calling card. It’s usually caused by worn solenoid seals or contaminated fluid that prevents smooth pressure control. Sometimes a simple fluid flush and a software re‑learn solves it, but often the damage is already deep inside the valve body.
For all intents and purposes, another telltale sign: the transmission falls out of gear when you stop at a red light, so that’s regularly traced to a shrunken 1‑2‑3‑4 molded apply piston seal inside the clutch drum. When the fluid gets too hot.
The seal shrinks, pressure drops, and you’re suddenly coasting. we'll see.
If you've to rev the engine to get the Encore moving again. The seal has likely failed.
Listen for odd noises, too; a whining or humming sound that changes with engine speed, particularly in the GX’s CVT, a lot signals belt wear or chain stretch. If the whine turns into a grinding noise. The transmission is likely on borrowed time.
What do the check engine light and P0700, P0751 codes mean?
Code P0700 is a generic “transmission control system malfunction” notice, but when it appears alongside P0751 or P0752, you’re dealing with a shift solenoid performance issue. The valve body isn’t directing fluid properly, and ignoring it leads to accelerated clutch pack wear.
GM’s diagnostic system logs these codes constantly. I’ve pulled identical faults from a 2017 Encore. Thinking about it more, with 80,000 miles and a 2021 with half that.
The data speaks for itself. The common thread? Old, burnt fluid that destroyed the solenoids; a solenoid replacement might run you $800‑$1,200, but if the clutches are already glazed, the bill jumps fast.
“The scariest issue of all is slipping gears, which can cause you to lose control during acceleration.” — Schepel Buick GMC Service Department
How Much Does a Buick Encore Transmission Replacement Cost?
Replacing a Buick Encore transmission now costs between $6,003 and $6,525, parts and labor included. That figure has crept up steadily, average replacement costs now top $6,000; which makes a remanufactured unit plus installation a serious financial hit for a subcompact crossover.
You’ll find some independent shops quoting closer to $5,500 if they source a used unit, but the risk of getting a transmission with similar hidden damage is high. The torque converter alone can cost $400‑$600.
For the average user. Not counting the labor to drop the subframe and wrestle the unit out. In my experience, owners who stretch the interval between fluid changes often end up on the high (though exceptions exist, naturally) end of that price range.
This is where it gets practical. For the GX with the 9‑speed. The repair costs are similar, but parts availability has been spotty, so a few 2024‑2025 models experienced a software‑related “black screen” issue in the virtual cockpit that (a detail regularly overlooked) misreported transmission warnings. The data speaks for itself, and the trend keeps going.
Causing owners to misinterpret real problems. One owner reported their 2025 Encore GX spent three weeks in the shop just a month. Hard to ignore those numbers. After buy due to reduced engine power warnings, a scenario that never should've happened.
Why the 6T40 Transmission Has So Many Problems
The GM 6T40’s Achilles’ heel is heat. When the fluid overheats — common in stop‑and‑go driving or when towing beyond the Encore’s modest limits, internal seals shrink, pressure drops, and the transmission begins to slip. Once the slip starts, clutch material contaminates the valve body, and a chain reaction of failures follows.
Actually, let me put that more plainly. It’s not just one part that breaks. The TEHCM (Transmission Electro‑Hydraulic Control Module) gets gummed up with debris. Worth considering. Which brings up an interesting point.
The 1‑2‑3‑4 apply piston seal loses its grip, and the wave plate in the clutch drum cracks from the stress. That’s a domino effect. Mechanics can sometimes clear the solenoids without disassembly.
What's the key lesson? A capable scan tool will instruct the TCM to cycle the solenoids. While the system is pressurized, flushing out debris.
I’ve done this a dozen times and saved clients thousands, thinking about it more, — but only if we caught it before the clutches burned.
“Check the 1‑2‑3‑4 molded apply piston seal; it may have shrunk, causing the transmission to fall out of gear at a stop.” — Transmission Diagnostics Group
The other elephant in the room is GM’s “lifetime fluid” claim. Transmissions don’t care about marketing.
Fluid degrades with heat cycles, and by 100,000 miles. The DEXRON‑VI in many Encores looks like black coffee. I insist on 45,000‑mile changes, and every customer who follows that schedule dodges the worst of the 6T40 problems.
Buick Encore GX: CVT vs. 9‑Speed — Which Is More Reliable?
In my shop, the 9‑speed automatic in the AWD Encore GX is noticeably more dependable than the CVT in front‑drive models. While the 9‑speed can occasionally hunt for gears on hills, it avoids the belt‑wear issues and droning drone that plague the CVT under hard acceleration.
What does that mean in practice? The CVT makes use of a steel belt, and pulley system that relies on perfect fluid pressure.
You could say set up a shudder that feels a lot like the 6T40’s 2‑3 clunk, but the fix isn’t always cheap, a failed CVT constantly calls for complete replacement. Because of the complexity of the belt assembly.
For context, Nissan Versa transmission problems with CVTs have shown similar failures — though the Encore GX’s CVT isn’t as widely criticized. The 9‑speed, by contrast, is a traditional stepped automatic.
It’s slower to shift but feels more predictable, and its clutch‑to‑clutch operation spreads the load better.
Here's the thing – granted, the 9‑speed isn’t bulletproof. I’ve seen a handful where the 4‑5 shift gets harsh after 70,000 miles, usually due to valve body wear. A software reflash regularly calms it down, but it’s something to test during a test drive.
Can You Prevent Buick Encore Transmission Failure?
Absolutely. The single most effective prevention is changing the transmission fluid and filter every 45,000 miles, no matter what the owner’s manual says. Combine that with an occasional scan‑tool cleaning cycle for the solenoids, and you dramatically lower the odds of a $6,000 surprise.
I’ve watched Encores easily cross 150,000 miles on the original transmission with this routine. Read that again if you need to. Those numbers tell a story. The owners who come in with a catastrophic failure?
They every time pushed the fluid change past 90,000 miles. It’s that simple.
- Drain and fill the transmission fluid — use only DEXRON‑VI for the 6T40 or the specified CVT fluid for GX models; do this by 45,000 miles.
- Install an external transmission cooler — it keeps fluid temps down and prolongs seal life, especially if you drive in hot climates.
- Request a solenoid cleaning procedure — a scan tool cycles the solenoids under pressure, flushing debris from the TEHCM without disassembly.
- Address harsh shifts immediately — a quick software re‑learn or fluid change now can prevent a rebuild later.
- Monitor for odd noises — a whine or rattle that changes with engine speed signals a failing torque converter or CVT belt.
More a lot than not, the preventative maintenance costs a couple hundred bucks every few years, and a replacement costs ten times that.
People Also Ask
Does Buick have a recall for the Encore transmission?
There is no wide‑ranging recall covering all Buick Encore transmissions. However, GM has issued technical service bulletins for harsh shifting and TEHCM reprogramming, and some 2024 Encore GX units got a transmission software fix to address driveability complaints.
But here's the thing – if your vehicle is under warranty, push the dealer to apply all relevant updates. I’ve seen dealers drag their feet on this. So bring the TSB number with you.
How long does a Buick Encore transmission last?
With strict 45,000‑mile fluid changes, a 6T40 can reach 130,000‑150,000 miles. Without them, failures as early as 70,000 miles are common. The CVT in the GX tends to last 100,000‑120,000 miles under similar care.### What is the most common problem with a Buick Encore?The harsh 2‑3 gear shift and slipping under load are the top complaints, followed by TEHCM solenoid failures that trigger warning lights. Many owners also report that the transmission feels like it’s been hit from behind during upshifts.### Can I drive with a bad transmission control module?No. A faulty TEHCM can cause erratic gear selection and sudden loss of drive, making the vehicle dangerous. If you get a P0700 code with solenoid performance faults, stop driving and get it diagnosed immediately.
FAQs
What fluid does a Buick Encore transmission take?
The 6T40 uses DEXRON‑VI automatic transmission fluid. The Encore GX CVT requires a specific GM CVT fluid. Never mix them, as the wrong fluid can destroy the unit within a few hundred miles.### Is the Buick Encore GX transmission better than the standard Encore?The GX’s 9‑speed performs better than the 6T40 in reliability and shift quality, but the CVT in front‑drive GX models isn't as sturdy. If you can, opt for the AWD GX for the 9‑speed.### Why is my Encore transmission making a rattling noise?A rattling sound at idle that goes away when you rev the engine often points to a failing torque converter. It’s a common pre‑failure warning on the 6T40 and should be inspected right away.
So, What’s Your Next Move?
You can either wait for the transmission to fail. And then swallow a $6,000+ repair bill. Or you can start a simple maintenance routine today. Actually, i’ve seen too loads of Encores come in on tow trucks mostly. Since an owner ignored a subtle jerk or a faint whine. The difference between a $300 fluid service.
And a complete rebuild is usually just a few thousand miles of neglect.
If you’re shopping for a used Encore. No proof of regular fluid changes? Walk away, or budget for a pre‑emptive overhaul. The Encore is a comfortable, practical little SUV when its transmission behaves, but you've to be the one making sure it does.
A speedy scan for trouble codes can also reveal hidden damage. Many other GM vehicles face similar transmission tough spots. The same maintenance logic applies across the lineup.
Take this as a case in point, the Chevy Malibu transmission problems and even Chevy transmission problems in larger models show you what happens when owners skip those fluid changes. Most likely ultimately, learning from those stories can, no, scratch that, save you from making the same expensive mistakes.
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