Ford F-150 3.5 EcoBoost Turbo, Explained (2015–2020)

It usually starts the same way. A 2015–2020 F-150 with the 3.5L EcoBoost sits idling in a bay, and somewhere under the hood is a faint metallic buzz that wasn’t there a year ago. The owner calls it “turbo trouble” — most people do — but that phrase covers at least three different failures with three different bills attached, and a good chunk of the diagnostic work is simply figuring out which one is actually in front of you. One is a rattle that’s almost always a cheap fix. Another, a shudder under hard acceleration, usually has nothing to do with the turbo at all, despite feeling like it should. Genuine turbo failure is the rarer third possibility — and even that one gives itself away once you know what to listen for.

Here’s the number that tends to end the small talk: a single turbocharger replacement typically runs C$2,200 to C$3,200 at a Canadian shop, and because this engine carries two turbos, replacing the pair commonly reaches C$4,500 to C$6,500. Worth reading on for two reasons — to see why the labour bill climbs that high, and because there’s a decent chance the truck in front of you doesn’t need that bill at all.

How boost works, and why there’s a wastegate at all

Start with the basic trick a turbo is playing. Spent exhaust gas spins a turbine, and that turbine forces extra air into the engine — that’s the boost that lets a relatively small V6 pull big-truck loads. Left unchecked, though, a turbo would happily build more pressure than the engine can safely swallow. So every turbo needs an escape valve, and that’s the wastegate’s whole job.

Picture the pressure-release valve on a stovetop pressure cooker. Nearly all the time it sits sealed shut, doing nothing at all. Only once pressure climbs past what’s needed does it crack open, bleed the excess, and snap shut again. On the 3.5 EcoBoost, an electric actuator does the same thing through a short linkage arm, opening and closing a flap in each turbo’s exhaust housing whenever boost runs ahead of what the engine is asking for.

Here’s the detail that throws people off when they first hear that rattle: at idle, with zero boost being made, the flap has nothing to vent — it’s supposed to sit fully closed and dead still. So when a technician traces the noise back to that same flap, the first instinct is to assume something’s under pressure. It isn’t. Wear works into the linkage over tens of thousands of kilometres, the flap stops seating tightly, and now it chatters against its seat every time the engine vibrates — with no pressure behind it at all. That’s the rattle solved: slop in a valve that isn’t even doing its job in that moment, not evidence the turbo itself is dying.

Which trucks, and which turbos

Knowing which engine you’re standing in front of narrows the diagnosis before a single tool comes out. The 13th-generation F-150 (Ford’s internal code P552) spans 2015–2020 with two distinct versions of the 3.5L EcoBoost V6, per CarBuzz’s P552 buyer’s guide: the 2015–2016 first-generation engine at 365 hp with a six-speed automatic, and the 2017–2020 second-generation engine at 375 hp with added port injection and Ford’s 10-speed. Both versions use two small BorgWarner turbos, one per cylinder bank, with the exhaust manifold cast directly into each turbine housing — compact and quick to spool, but buried deep and hot to the touch, which is exactly why getting a wrench in there costs what it costs.

Three things owners lump together — and shouldn’t

This is where the sorting happens, and it’s mostly done by ear and by history before anything gets torn apart.

Wastegate rattle is the linkage-looseness issue walked through above: a buzzing or rattling metallic sound at idle or light throttle, the kind owners often compare to shaking a can of spray paint. It turns up most on 2017–2018 second-generation trucks, sometimes well under 100,000 km, and it fades as the revs climb — because once there’s real exhaust flow, the flap has actual work to do and stops rattling loose.

Actual turbo failure sounds and behaves nothing like that: a rising, siren-like whine, power loss or limp behaviour, blue or white smoke from oil working past worn seals, and trouble codes such as P0299 (underboost) or P0244 (wastegate control range). Push the wear far enough and the compressor wheel can eventually touch its own housing. That’s a dead turbo, and of these three, it’s the only one that reliably ends in full turbo replacement.

The shudder is the trickiest one to read, precisely because it shows up under acceleration and feels like something spinning is about to let go. It isn’t. The next section is where that gets untangled.

Why the shudder isn’t a turbo problem, even though it feels like one

Chase the shudder far enough and the trail leads somewhere unexpected — the intercooler (Ford calls it the charge air cooler), not anything spinning inside the turbo. In humid weather, moisture in the boosted air condenses and pools inside that cooler during long, light-load highway cruising. Nothing happens while the truck stays gentle. Floor the throttle after that quiet buildup, though, and the pooled water gets pulled into the cylinders all at once — the engine stumbles because for a moment it’s swallowing water instead of air-fuel mixture, and that’s what reads as a shudder.

Ford’s remedy, described in TSB 13-8-1, relocated the intercooler’s air deflector from top to bottom so any condensate re-vaporizes instead of pooling, paired with updated PCM calibration and, in some cases, a redesigned intercooler. The bulletin formally covers 2011–2012 trucks, but the same intercooler design carried forward, and the same complaints keep surfacing on later F-150s — which is why aftermarket drain-plug intercoolers exist for 2015+ trucks in the first place. One thing worth flagging before anyone reaches for a drill: the popular DIY fix of adding a 1/16-inch drain hole in the cooler can open up a leak of its own, as Underhood Service warns. It quiets the symptom without touching the cause.

Fixing the rattle

Once the rattle is confirmed for what it is, the fix is almost anticlimactic. TSB 20-2016 has a technician install a small spring kit that holds the linkage closed under vibration — parts cost well under C$100. The story doesn’t always end there, though: owners on the F-150 Forum TSB 20-2016 thread report the rattle sometimes creeping back after only the linkage was treated, which is why a related bulletin, TSB 20-2091, exists for actuator or turbo work reserved for more advanced wear. Caught early, a rattle is a C$150–C$400 job. Left alone until the actuator or turbo itself gives out, that same noise becomes a C$2,200+ job. If it’s not obvious yet which category you’re in, that’s a reason to get it inspected rather than guess — a clear written estimate spells out which of those two repairs you’re actually signing off on.

Safety and drivability risk

On its own, a rattle is just noise. The risk shows up further down the timeline: a wastegate that’s lost its grip can drift into overboost or underboost, and on a loaded truck merging onto a highway, the power you were counting on simply isn’t there when you need it. Condensation-related misfires carry their own slower cost — unburned fuel pushed into the exhaust stream can wear down catalytic converters over time. Any persistent misfire, regardless of which of these is behind it, deserves the same diagnostic process as any other engine.

There’s a separate thread here that has nothing to do with turbos at all, and it shouldn’t get lost in the noise: a genuine safety recall touches this exact engine family. The brake master cylinder on 3.5L EcoBoost trucks can leak fluid into the booster. Per Driving.ca, Transport Canada recall 2025-198 (Ford’s 25S37) covers 13,875 vehicles in Canada — an expansion of recalls 2022-115 and 2020-252 — with the master cylinder replaced free of charge. Checking your VIN takes minutes, and Mecano’s free VIN recall lookup does the same check in one place.

What it costs to fix in Canada

Once the diagnosis lands on one of the three paths above, the bill follows a fairly predictable shape. All figures below are typical Canadian ranges; your actual quote will depend on province, shop rate, and how much has to come apart to get at the problem:

• Diagnosis (scan, boost test, inspection): C$130–C$180
• Wastegate spring kit per TSB 20-2016 (parts under C$100): C$150–C$400 out of warranty
• Single turbo replacement: C$2,200–C$3,200 — RepairPal’s U.S. estimator averages US$1,576–US$1,932 with labour; Canadian shop rates push higher
• Both turbos: C$4,500–C$6,500, since the labour is essentially done twice
• Intercooler replacement with reflash: C$900–C$1,600

On a high-mileage truck worth $18,000–$35,000, a twin-turbo job eats a meaningful slice of what the truck is even worth — reason enough to run the math before authorizing anything, and to get a second read from an independent shop in Mecano’s directory.

What you can do right now

The same sequence a technician runs through works just as well from the driver’s seat, before anything’s booked in:

1. Listen cold. Start the truck cold, hood up, and listen for that spray-paint-can rattle.
2. Scan for codes. A cheap OBD reader logging P0299, P0244, or misfire codes builds a paper trail months before anything actually fails.
3. Change oil on time, full synthetic. Turbo bearings are the first thing to suffer when oil-change intervals stretch.
4. Reproduce the shudder on purpose. Twenty highway minutes on a humid day, then a firm merge. If it stumbles, you can hand the technician an intercooler case instead of a vague “turbo noise” complaint.
5. Keep records. TSB work, PCM updates, and recall completions all help at resale and when negotiating goodwill coverage.

Used-buyer checklist for the 2015–2020 F-150 3.5 EcoBoost

• Cold start: listen for wastegate rattle, and ask whether the spring-kit TSB was ever done.
• Highway-then-boost test: hesitation at full throttle in damp weather is a legitimate negotiating point.
• Full OBD scan — not just “no check-engine light” — for stored boost, misfire, or wastegate codes.
• Service records proving regular oil changes; these turbos forgive a lot, but not neglect.
• Verify recall completion by VIN, especially the master-cylinder campaign (TC 2025-198).
• Cross-shop the 5.0L V8 while you’re at it: it carries its own known oil-consumption pattern. Every engine in this generation has a watch item — the real question is which one you can live with.

Frequently asked questions

These are the questions that come up once the diagnosis is settled and the owner is deciding what to do next.

Is wastegate rattle on the 3.5 EcoBoost serious?

Usually not, at least not right away. Early on it’s just loose play in the wastegate linkage or actuator arm on 2017–2018 trucks — annoying, not dangerous. Left alone, though, that same wear can progress into boost-control faults and real power loss, and the fix ranges from a cheap spring kit (Ford TSB 20-2016) to full turbo replacement. Better to get it looked at while it’s still just a noise.

What does EcoBoost shudder feel like?

An intermittent stumble, shake, or misfire when you accelerate hard after a long highway run, most often in humid or damp weather. It feels alarming, but on the 3.5 EcoBoost it’s usually just condensation that pooled in the intercooler getting pulled into the engine all at once — not a failing turbo. Ford’s fix was relocating the intercooler’s air deflector and updating the PCM software.

How much does turbo replacement cost on a 2015–2020 F-150 in Canada?

Expect roughly C$2,200–C$3,200 per turbo at an independent Canadian shop, and C$4,500–C$6,500 if both need replacing, since labour on this engine is heavy no matter which turbo fails. U.S. estimator data puts a single turbo assembly at US$1,576–US$1,932, which lines up once you apply Canadian labour rates.

Did Ford recall the F-150 for turbo wastegate problems?

No — wastegate rattle is handled through service bulletins (TSB 20-2016 and related), not a safety recall. There is a genuine recall affecting this engine family, but it’s unrelated: Transport Canada recall 2025-198 covers brake master cylinder leaks on 3.5L EcoBoost F-150s, Expeditions, and Navigators. Worth checking your VIN either way.

What should I check on a used 2015–2020 F-150 EcoBoost?

Start it cold and listen for a metallic rattle near the turbo area that fades as revs climb. Then test a highway cruise followed by a full-throttle merge to check for shudder. Pull the OBD history for boost or misfire codes, ask for service records showing regular oil changes, and confirm that any recall work — especially the master cylinder campaign — has been completed.

Sources & further reading

• CarBuzz — 13th-Gen Ford F-150 (P552) Buyer’s Guide
• Underhood Service — The Ford 3.5L EcoBoost Engine’s Most Common Problems
• Truck Insiders — 7 Common Ford F-150 3.5L EcoBoost Problems
• RepairPal — Ford F-150 Turbocharger Assembly Replacement Cost
• CarComplaints — 2017 Ford F-150 Technical Service Bulletins
• F-150 Forum — Rattle from Engine Compartment (TSB 20-2016)
• Driving.ca — Ford recalls 13,875 trucks in Canada due to brake fluid leak