Ford 2.5L Hybrid Engine Diagram: 2026 Maverick and Escape
A Ford 2.5 hybrid engine diagram shows what looks like an ordinary four-cylinder until you notice what is missing. There is no conventional starter drive, no accessory belt diagram in the owner’s manual, and no torque converter. Two electric motors inside the eCVT transaxle take over those jobs.
This 2.5L iVCT Atkinson-cycle engine powers the 2022 and newer Maverick Hybrid and the 2020 to 2026 Escape Hybrid and Plug-In Hybrid. An earlier 2.5L hybrid served the 2009 to 2012 Escape and Fusion family.
Below, you get a labeled under-hood map, the engine internals, the eCVT layout, both cooling loops, and specs for every generation. Start by confirming which version sits under your hood.
Ford 2.5L Hybrid PowerSplit Layout
How one planetary gear set splits power between the engine, two motors, and the wheels
2.5L Atkinson Engine
DOHC, intake iVCT, port injection. Runs on 87 octane despite a 13.0:1 compression ratio.
Planetary Gear Set Inside the eCVT
Traction Motor and Wheels
Drives the wheels and recovers energy under braking. Maverick rating: 94 kW and 173 lb-ft.
Generator Motor
Starts the engine, controls engine rpm, and charges the high voltage battery. No torque converter needed.
Inverter and HV Battery
Liquid-cooled lithium-ion pack on the low temperature loop. Never touch orange components.
Specs: Ford Maverick technical specifications and owner’s manual. Output figures shown are for the Maverick Hybrid. 2022 to 2024 Maverick and Escape Hybrid use the HF45 transaxle.
Which Ford 2.5L Hybrid Engine Is in Your Vehicle
Ford has built two different 2.5L hybrid engines, and the diagram depends on which one you own.
Gen 2 Hybrid Models 2009 to 2012
The second-generation system powered the 2009 to 2012 Escape Hybrid and Mercury Mariner Hybrid, the 2010 to 2012 Fusion Hybrid, the 2010 to 2011 Milan Hybrid, and the 2011 to 2012 Lincoln MKZ Hybrid. These models use a nickel-metal hydride battery pack: 330 volts in the Escape and 275 volts in the Fusion family.
Gen 4 Hybrid Models 2020 to 2026
The current engine runs in the 2020 to 2026 Escape Hybrid and Plug-In Hybrid, the 2021 and newer Lincoln Corsair Grand Touring, and every Maverick Hybrid since 2022. AWD became available on the Maverick Hybrid for 2025. Escape and Corsair production ended at Louisville Assembly in December 2025.
How To Confirm Your Engine
The window sticker on a Maverick lists “Engine: 2.5L Hybrid.” Parts catalogs show the 2020 to 2024 Escape hybrid engine with code “Z” in the eighth VIN digit. Note that the 2013 to 2020 Fusion and C-Max hybrids used a 2.0L Atkinson engine, so this guide does not apply to them.
Safety first: Ford’s Maverick battery removal guide states that the high-voltage system runs at about 450 volts DC. High-voltage cables are wrapped in orange tape or orange covering. Never cut, unplug, or probe anything orange.
With your generation confirmed, here is what you see when the hood opens.
Ford 2.5 Hybrid Engine Diagram of the Under Hood Layout
Open the hood of a 2.5L hybrid and the first thing that stands out is two coolant caps where a gas engine has one. Ford’s under hood overview for the 2.5L HEV and PHEV labels the 2020 to 2026 Escape bay like this. The Maverick Hybrid uses the same core fill points.
- A. Windshield washer fluid reservoir
- B. Low temperature coolant cap
- C. High temperature coolant cap
- D. Engine oil filler cap
- E. Engine oil dipstick
- F. Brake fluid reservoir
- G. Power distribution box
- H. Air filter assembly
Fluid Fill Points and Reservoirs
You will find the oil filler cap and dipstick on top of the engine. Oil capacity is 5.7 quarts with the filter. The two coolant caps feed separate circuits, which we cover below.
Air Intake and Throttle Path
Air enters through the air filter assembly and passes through a composite intake manifold. The throttle is electronically controlled, so you will not find a throttle cable.
Hybrid Electronics and Inverter Module
The power distribution box holds fuses you will not see on a gas engine. These include a 60A power inverter fuse, a DC/DC converter fuse, and a 50A fuse for the electric water pump. Owners who have traced the wiring report that the inverter sits on top of the transaxle.
12V and High Voltage Battery Locations
On the Maverick Hybrid, Ford’s spec sheet places the liquid-cooled high-voltage battery on the passenger side under the cabin. The 12V battery sits under the rear passenger-side seat. Jump-start terminals sit under the hood, beneath a red cap on the driver side.
On the Escape Hybrid, the 12V battery sits under the cargo floor behind the right rear seat. The Escape PHEV’s 14.4 kWh battery sits below the second-row seats.
Those are the parts you can touch. The engine underneath works differently from a standard four-cylinder.
What Sits Inside the 2.5L iVCT Atkinson Cycle Engine
The Gen 4 engine runs a 13.0:1 compression ratio, yet Ford’s 2023 Escape spec sheet calls for only 87 octane minimum. The Atkinson cycle explains that combination.
Aluminum Block and Cylinder Head
Displacement is 152 cubic inches, or 2,490 cc. Bore and stroke measure 3.50 x 3.94 inches. Ford builds the engine in Chihuahua, Mexico, the same plant covered in our guide to where Ford Mavericks are made.
DOHC Valvetrain With Intake iVCT
Dual overhead cams run four valves per cylinder through direct-acting mechanical bucket lifters. Variable cam timing works on the intake cam only. A timing chain drives the cams, and parts catalogs list a stock chain for the 2021 to 2024 Escape hybrid engine.
Atkinson Cycle Valve Timing
The intake valve stays open into the early compression stroke. That pushes some air back out, so effective compression runs lower than the 13.0:1 rating. The engine trades low-end torque for efficiency, and the electric motors fill the torque gap.
Port Fuel Injection and Ignition
Fuel arrives through sequential multi-port injection, not direct injection. The owner’s manual lists coil-on-plug ignition, a 1-3-4-2 firing order, and a spark plug gap of 0.049 to 0.053 inch. Ford’s owner’s manuals show drive belt routing only for the EcoBoost engines.
The engine only tells half the story. The other half lives inside the transaxle.
How the PowerSplit eCVT Links the Engine and Two Motors
There is no belt, no pulley, and no torque converter inside Ford’s eCVT.
Planetary Gear Set Roles
A single planetary gear set splits power three ways. The engine drives the planet carrier. The smaller generator motor connects to the sun gear, and the ring gear feeds the wheels alongside the traction motor.
The gear ratios are fixed. Ford engineers explained that the “variable” part comes from using one motor to control engine speed for best economy or best power.
Generator Motor and Traction Motor
The generator motor spins the engine to start it and controls engine rpm while driving. It also charges the high-voltage battery. The traction motor drives the wheels and recovers energy during braking. Ford rates the Maverick’s traction motor at 94 kW and 173 lb-ft.
HF45 vs HF55 Transaxle Differences
The 2022 to 2024 Maverick Hybrid and the Escape Hybrid use the HF45 transaxle. For 2025, Ford confirmed to Ford Authority that the Maverick moved to the HF55, which offers higher torque capacity in the same package size.
The HF55 made the Maverick Hybrid AWD 4K Tow Package possible. Ford’s 2025 Maverick technical specifications list 4,000 pounds with that package and a 3.37:1 final drive, up from 2.91:1 in 2022. See the full Ford Maverick towing capacity chart for every configuration.
Gen 2 models used an Aisin-built power-split unit that follows the same basic principle.
Two electric motors and an inverter generate heat that one radiator loop cannot manage, which explains the second coolant cap.
Why the 2.5L Hybrid Uses Two Separate Coolant Loops
Ford lists 11.6 quarts for the engine loop and 4.7 quarts for the electric loop on the 2022 Maverick. On the 2025 Maverick, those figures change to 9.6 and 4.9 quarts.
The high-temperature loop cools the engine. The low-temperature loop cools the inverter, motors, and high-voltage battery.
| Vehicle | High Temp Loop | Low Temp Loop |
|---|---|---|
| 2022 Maverick Hybrid | 11.6 qt | 4.7 qt |
| 2025 Maverick Hybrid | 9.6 qt | 4.9 qt |
| 2023 Escape Hybrid | 11.1 qt | 5.5 qt |
The 2025 Maverick owner’s manual lists 5.0 quarts for the low-temp circuit, slightly above the spec sheet figure. Ford’s 2023 Escape spec sheet appears to swap its gasoline and electric labels, so check your manual before you buy coolant.
Owners quoting the Maverick manual list Motorcraft Yellow Prediluted coolant, VC-13DL-G, meeting WSS-M97B57-A2, for both circuits. Never open either cap while the system is hot.
Here is how every generation compares on paper.
Ford 2.5L Hybrid Specs Compared Across 3 Generations
The hybrid 2.5L shares its displacement with Ford’s standard 2.5L, but almost every spec that matters is different.
| Spec | Gen 2 2009 to 2012 | Gen 4 With HF45 | Gen 4 With HF55 |
|---|---|---|---|
| Displacement | 2,488 cc | 2,490 cc | 2,490 cc |
| Compression | 12.3:1 | 13.0:1 | 13.0:1 |
| Engine Output | 153 to 156 hp | 162 to 163 hp | 162 hp |
| System Output | 177 to 191 hp | 191 to 221 hp | 191 hp |
| Battery | 275V or 330V NiMH | 1.1 kWh Li-ion HEV, 14.4 kWh PHEV | 1.1 kWh Li-ion |
| Transaxle | Aisin power-split | HF45 | HF55 |
The HF45 column covers the 2020 to 2026 Escape and 2022 to 2024 Maverick. The HF55 column covers the 2025 and newer Maverick. System output varies by model. The Escape PHEV made 221 hp in early years, and Ford dealer data lists 210 hp for later models.
According to WardsAuto’s 2009 engine review, the Gen 2 hybrid used new manifolds, a new intake cam, and 12.3:1 pistons, compared with 9.7:1 in the non-hybrid 2.5L.
Specs show design intent. Owner reports show where the components actually fail.
5 Common Problems Tied to Specific 2.5L Hybrid Components
Most 2.5L hybrid complaints trace back to the electronics and safety recalls, not to worn-out engine parts.
Engine Block Failure and Fire Risk
Recall 22V-484 covered 100,689 vehicles in July 2022, and recall 23V-380 expanded it to 125,322 vehicles built through 2023. A failed engine can release oil and fuel vapor near hot parts. Ford estimated that about 1% of recalled vehicles see this failure.
Hybrid Powertrain Control Module Software
Recalls 24V-330, 25V-133, and 25V-881 address HPCM software that can shift the vehicle into neutral and cut drive power. The HPCM is the computer that coordinates the engine and both motors.
High Voltage Battery Cells
Recalls 24V-954 and 25V-789 target 2020 to 2024 Escape PHEV battery cells that can short internally. Recall 22V-149 replaced high-voltage batteries on some 2021 to 2022 Escape hybrids. See our guide to how long a Ford Escape hybrid battery lasts.
12V Battery Failure
Ford recalled certain 2022 to 2023 Maverick models because the 12V battery could degrade and fail suddenly. One owner reported failure at 3.5 years and about 46,000 miles. Replacement means removing rear-seat trim.
Coolant Errors After Service
Maverick owners report overheating and air pockets after dealer coolant work, including loops refilled with the wrong coolant color. Both circuits need the specified coolant and proper bleeding.
Run your VIN through NHTSA’s recall lookup before buying a used 2.5L hybrid. A few habits prevent most of these issues.
4 Tips for Working Safely Around the 2.5L Hybrid Engine
- Shut the system fully off. The gas engine starts on its own whenever the vehicle is in Ready mode. Never reach into the bay while the Ready light is on.
- Use the correct oil. The 2.5L hybrid calls for SAE 0W-20 meeting Ford WSS-M2C962-A1. Our Ford engine oil recommendation chart lists the specs for every engine.
- Service both coolant loops. Ask the shop to drain and bleed the low-temp circuit, not just the radiator side.
- Leave orange components alone. Inverter and high-voltage cable work belongs to trained hybrid technicians.
What the Ford 2.5L Hybrid Diagram Tells Every Owner
A Ford 2.5L hybrid engine diagram makes sense once you know three things. You have either the 2009 to 2012 or the 2020 and newer engine. Two coolant caps serve two separate loops. The eCVT uses one planetary set and two motors instead of belts and gears.
With that map in hand, routine jobs like oil changes, coolant checks, and 12V battery diagnosis become straightforward. You will know which cap to open, which fluid to buy, and which components to leave alone. Keep this diagram bookmarked, check your VIN for open recalls before your next service, and leave the orange cables to trained hybrid specialists.
Frequently Asked Questions
Is the Ford 2.5 hybrid a good engine
Yes, for efficiency and durability, with one caveat. The design uses a timing chain and no accessory belt, which keeps maintenance low. However, 2020 to 2023 Escape, 2022 to 2023 Maverick, and 2021 to 2023 Corsair hybrids fall under fire-risk recalls, so confirm the remedy is complete.
Does the Ford 2.5L hybrid have a timing chain or timing belt
It uses a timing chain. Parts catalogs list a stock timing chain for the 2021 to 2024 Escape 2.5L hybrid engine. Ford’s owner’s manuals show no accessory drive belt routing for the hybrid, only for the EcoBoost engines. Change the oil on schedule to protect the chain guides.
Is the 2.5L hybrid engine the same in the Maverick and Escape
The core engine is the same. Both use a 2,490 cc Atkinson-cycle I-4 with a 13.0:1 compression ratio. The 2025 and newer Maverick uses the stronger HF55 transaxle, while the Escape Hybrid used the HF45. Under-hood layouts differ slightly, mainly in the 12V jump point and battery locations.
Does the Maverick Hybrid have a starter or alternator
No conventional versions of either. The generator motor inside the eCVT spins the engine to start it and charges the high-voltage battery. A DC/DC converter then keeps the 12V battery charged, which is why the under-hood fuse box carries a dedicated DC/DC converter fuse.
Where is the hybrid battery located on the Ford Maverick
Ford places the high-voltage battery on the passenger side under the cabin. The separate 12V battery sits under the rear passenger-side seat. You jump-start the truck from terminals under the hood, not at the battery. Those terminals sit beneath a red cap on the driver side.
How much horsepower does the Ford 2.5L hybrid engine make
The gas engine alone makes 162 hp at 5,600 rpm in the Maverick. With the electric motor, total system output reaches 191 hp. The Escape Hybrid lists 192 to 200 hp, and the Escape PHEV up to 221 hp.