2018-2020 Pilot & 2023-2025 Ridgeline 3.5L J-Series V6: Problems, Identification, and Used Replacement

Engine Identification: Is This Your V6?

This guide covers the specific Honda 3.5L V6 engine, code J35Y6, found in specific model years of the Honda Pilot and Ridgeline. This is a direct-injection, single overhead cam (SOHC) V6 belonging to Honda's J-Series engine family. Direct injection means fuel is sprayed at high pressure directly into the cylinder, which is different from older port injection systems.

This engine is factory-installed in these North American market vehicles:

How to Confirm Fitment on Your Vehicle

Before buying a replacement, you must confirm your vehicle has this exact engine. Using the wrong engine will lead to major installation problems.

1. Check Your Transmission: This engine ONLY works with vehicles that have the 9-speed ZF automatic transmission. The easiest way to check is by looking at your center console. If you have a panel of electronic push-buttons to select gears (P, R, N, D), you have the correct 9-speed transmission.
2. Check Your VIN: The Vehicle Identification Number (VIN) contains codes that identify the original factory-installed components.
   • For a 2018–2020 Honda Pilot, the 6th digit of your VIN must be a 5 (for Front-Wheel Drive) or a 6 (for All-Wheel Drive).
   • For a 2023–2025 Honda Ridgeline, the 4th digit of your VIN must be a Y.
3. Check the Engine Code: The engine code is physically stamped on the engine block. You can find a flat, machined pad on the front of the engine (facing the radiator) near where the engine bolts to the transmission. This pad should be stamped with J35Y6.

Common Failure Symptoms

If your engine has failed, you may experience one or more of these critical symptoms:

• Catastrophic Engine Failure: A sudden, loud knocking or grinding noise from the engine, followed by a complete loss of power or engine seizure. This is often related to the crankshaft and connecting rod bearing issue.
• Check Engine Light: A flashing or steady check engine light is common. It is often accompanied by diagnostic trouble codes (DTCs) for engine misfires (P0300-P0306) or air-fuel ratio imbalances (P219A, P219B). These can point to failing fuel injectors, carbon buildup, or VCM-related issues.
• Excessive Oil Consumption: Needing to add oil between changes can be a sign of problems with the Variable Cylinder Management (VCM) system, where oil can be pulled past the piston rings on deactivated cylinders.
• Rough Idling and Misfires: As a direct-injection engine, the intake valves are not cleaned by fuel spray. Over time, carbon can build up on the valves, causing rough running, especially when the engine is cold.

Diagnostic Flowchart

Known Problems, Recalls, and Service Bulletins

This J35Y6 engine and its close relatives have several well-documented issues. Honda has addressed some of these with recalls or warranty extensions.

Connecting Rod Bearing and Crankshaft Defect

NHTSA Recall 23V-751 / Investigation PE25008 / RQ24013: This is the most severe issue. A manufacturing defect on the engine's crankshaft can cause the connecting rod bearings to wear out prematurely and seize. This results in catastrophic engine damage, which can cause the engine to stall while driving. The recall applies to certain 2016, 2018–2019 Honda Pilot and 2017, 2019 Honda Ridgeline models, among other Hondas. Dealers will inspect the engine and repair or replace it if necessary. The manufacturing process was corrected in 2020.

Direct-Injection Fuel Injector Failure

Honda Service Bulletins 20-100 & 21-010: Debris from the manufacturing process can clog fuel injectors, leading to misfires and setting various trouble codes. Honda extended the warranty for this issue on certain models to 10 years or 150,000 miles. This specifically affects some 2017–2019 Honda Pilot and Ridgeline models. The repair involves replacing the faulty fuel injectors and sometimes updating the computer software.

Variable Cylinder Management (VCM) Oil Consumption

Honda Service Bulletin 13-082: This issue affects many Honda V6 engines with VCM. The VCM system deactivates some cylinders to save fuel, but this creates a vacuum that can pull oil past the piston rings. This leads to fouled spark plugs, misfires, and active engine mount wear. While the bulletin specifically mentions older models, the underlying VCM technology and potential for oil consumption persist in this engine family across all production years.

Intake Valve Carbon Buildup

This is a common issue for all direct-injection (DI) engines across all production years. Because fuel is injected directly into the cylinder, it no longer washes over the intake valves. Oil vapor from the crankcase ventilation system can bake onto the hot valves, forming hard carbon deposits. Over many miles, this buildup can restrict airflow, causing rough idling and misfires.

What Fails at Every Mileage Band

Under 60,000 Miles

Even low-mileage engines can suffer from the catastrophic connecting rod bearing failure (NHTSA Recall 23V-751). The improperly ground crankshaft pins cause rapid bearing wear. Fuel injector clogging is also possible in this band, leading to misfires (P0300-P0306).

• ✓Do during install (required): Verify the donor vehicle's VIN on the NHTSA website to see if it was part of the crankshaft recall and if the remedy was performed.
• ✓Do during install (recommended): Install a VCM Muzzler. Disabling the Variable Cylinder Management system early prevents oil consumption, spark plug fouling, and premature engine mount wear from starting.
• ✓Cheap insurance while the engine is out: Perform a baseline fluid change. Start fresh with 5.7 quarts of 0W-20 full synthetic oil, an OEM filter, and new Honda Type 2 Blue coolant.

60,000 - 100,000 Miles

At this stage, the effects of the VCM system become apparent. Deactivated cylinders allow oil to seep past piston rings, fouling spark plugs (especially in the rear bank) and setting misfire codes (P0301-P0304). The vibrations from VCM engagement also cause the active control engine mounts (ACM) to fail. Intake valve carbon buildup begins causing rough idles.

• ✓Do during install (required): Perform a complete timing belt service. The service interval is 100,000-105,000 miles or 7 years. Replace the timing belt, water pump, and hydraulic tensioner as a complete kit (Aisin TKH-002 or OEM Honda). This is an interference engine; a snapped belt destroys it.
• ✓Do during install (recommended): Install a VCM Muzzler to halt further VCM-related wear.
• ✓Cheap insurance while the engine is out: Replace spark plugs and seals. Install six new OE-spec NGK Laser Iridium spark plugs (NGK DILZKR7B11G) and replace the valve cover and spark plug tube seals. Consider a walnut blast cleaning of the intake valves to remove carbon buildup.

100,000 - 150,000 Miles

Engines in this range are on borrowed time if the original timing belt and water pump have not been replaced. If VCM has not been disabled, oil consumption can become severe (up to 1 quart per 1,000 miles), leading to clogged catalytic converters. VTEC solenoid assembly gaskets also become brittle and leak oil onto the alternator.

• ✓Do during install (required): Full timing belt and seal service. Replace the timing belt, water pump, tensioner, pulleys, front crankshaft main seal, rear main seal, and camshaft seals.
• ✓Do during install (required): Full gasket refresh. Replace valve cover gaskets, spark plug tube seals, VTEC solenoid gasket, and intake manifold gaskets.
• ✓Do during install (recommended): Install a VCM Muzzler. It is never too late to prevent further wear.
• ✓Cheap insurance while the engine is out: Perform intake valve cleaning and replace spark plugs.

Over 150,000 Miles

High-mileage examples require attention to all seals, gaskets, and sensors. An engine run this long without VCM disabled or intake valves cleaned will likely have significant oil consumption and poor performance. Valve adjustments may also be needed.

• ✓Do during install (required): Assume nothing is good. Treat it as a long block and perform a complete reseal, including all timing components, water pump, front/rear main seals, valve cover gaskets, and oil pan gasket.
• ✓Do during install (recommended): Mandatory VCM Muzzler installation and thorough intake valve cleaning.
• ✓Cheap insurance while the engine is out: Transfer all known-good accessories (alternator, starter, A/C compressor) from your original engine if they are functional.

Real Owner Experiences

The following table highlights real-world failures and the costs owners faced when dealing with this engine family.

Repair or Replace?

Deciding whether to fix your current engine or swap it out depends entirely on the failure mode.

• When Repair Makes Sense: If the core engine block and internals are healthy, repairs are the way to go. Direct-injection fuel injector wear and clogging typically costs $800 to $2,300 to fix. Direct injection carbon buildup cleaning (walnut blasting) runs $500 to $1,200. A standard timing belt and water pump service costs $950 to $1,800.
• When Replacement is Smarter: Replacement is the only viable option in cases of catastrophic internal failure, specifically the connecting rod bearing seizure identified in NHTSA Recall 23V-751. This failure sends metal debris throughout the engine, rendering it irreparable. With dealer quotes for a new engine ranging from $11,000 to over $20,000, a lower-mileage used or remanufactured unit becomes the most logical choice.

Replacement Cost Estimates

Engine replacement is a major expense. Prices vary based on supplier, part condition, and local labor rates. The following table provides a general estimate based on aggregated market data.

Key Installation Steps & Gotchas

Installing this engine is a job for an advanced DIYer or a professional shop. Several steps are critical for success.

Required Parts & Procedures

When the engine is out of the vehicle, it's the perfect time to replace key service items. Always install the following new parts with a replacement engine:

• Timing Belt, Water Pump, and Tensioner Kit (Aisin TKH-002 or OEM Honda)
• Six OE-specification spark plugs (NGK DILZKR7B11G)
• New engine oil (5.7 quarts of 0W-20 synthetic) and OEM filter
• Honda Type 2 Blue Coolant (complete flush and fill)
• All necessary gaskets (intake, exhaust, valve covers) and seals
• Direct injection Teflon seals (if transferring original fuel injectors)

Common Installation Mistakes to Avoid

• The Crank Pulley Bolt Battle: The factory bolt is tightened to extreme torque and often rusted. You must use a 50mm Hex Crankshaft Pulley Holder (OEM 07MAB-PY3010A / 07JAB-001020A) with a massive breaker bar, or a Heavy-Duty 19mm Harmonic Balancer Socket (Lisle 77080) with a high-torque impact wrench.
• FWD vs. AWD Oil Pan and Intermediate Shaft Bracket: If swapping an engine between FWD and AWD configurations, you must transfer the oil pan, intermediate shaft bracket, and oil filter adapter housing from your original engine.
• Fragile Active Control Engine Mounts (ACM): Electronic active engine mounts have fragile electrical connectors at their bases that are easily crushed during engine movement. Use an Engine Support Hanger / Brace (OTC 4324) to manage weight carefully.
• High-Pressure Fuel System Safety: The direct-injection system operates at over 2,000 PSI. Relieve pressure before disconnecting using direct-injection fuel line disconnect tools. High-pressure fuel pipe joint seals are one-time-use only.
• The 6-Speed vs. 9-Speed Transmission Trap: Buying this engine for a vehicle equipped with a 6-speed automatic transmission is a fatal mistake. The engine blocks are physically different; starter motor mounts and bellhousing bolt patterns do not match.

Questions to Ask Your Installer

• Have you successfully performed the Crankshaft Position (CKP) Pattern Relearn procedure on a modern Honda V6 before? Do you have the dealer-level scan tool required to do it?
• How do you plan to tackle the crankshaft pulley bolt? Do you have the 50mm hex holder tool or a high-torque impact wrench and weighted socket?
• Will the quoted price include replacing the 'while you're in there' consumables like the timing belt, water pump, tensioner, spark plugs, and main seals?
• My vehicle is [FWD/AWD]. The donor engine is from a [FWD/AWD]. Are you aware that the oil pan and intermediate shaft bracket may need to be transferred from my original engine?
• Will you be using new direct-injection fuel injector seals if the injectors are transferred? Are you aware the high-pressure fuel pipe seals are one-time use?
• How will you protect the fragile electrical connectors on the active engine mounts during the swap?

Freight & Delivery Reality

A used J35Y6 engine assembly is a massive piece of machinery. It weighs approximately 360 pounds and measures roughly 48" x 40" x 32" before crating. Because of this size and weight, it ships as LTL (Less Than Truckload) freight on a wooden pallet. It is NOT a parcel delivery.

If you are having the engine delivered to a residential address or a shop without a loading dock or forklift, you must request a truck with a liftgate service to lower the pallet to the ground. Always inspect the engine thoroughly for any shipping damage (such as crushed sensors, cracked valve covers, or broken mount brackets) before signing the driver's delivery receipt.

Arrival Inspection: Compression and Leak-Down Testing

When your used engine arrives, test the cylinders before you install it. A compression test measures the pressure inside each cylinder. A leak-down test pumps air into the cylinder to see if it holds pressure. These tests tell you if the internal piston rings and valves are healthy.

• Compression Expectations: A healthy J35Y6 engine should show between 135 and 200 PSI (pounds per square inch) in each cylinder. The most important rule is that all six cylinders must be within 10% to 15% of each other.
• Leak-Down Expectations: A good used engine should have less than 15% air loss in each cylinder. If you hear air escaping from the exhaust or intake, the valves are not sealing.

Before the First Start: Fluids and Priming

Never start a replacement engine dry. Used engines sit on shelves for months, and all the oil drains away from the moving parts. You must prime the oil system first.

1. Add Fresh Fluids

Before you try to start the engine, you must install a new oil filter and fill the engine with fresh fluids. Do not reuse the old oil or coolant.

• Engine Oil: Use 0W-20 full synthetic motor oil. This thin oil is required for the variable valve timing system to work correctly.
• Engine Coolant: Use Honda Type 2 antifreeze (or an equivalent blue 50/50 pre-mixed coolant designed for Asian vehicles). Do not use standard green coolant, as it will damage the water pump seals.

2. Prime the Oil System

Priming means pumping oil through the engine before the engine actually fires up and runs. Follow these steps to prime your J35Y6 engine:

1. Disable the fuel and spark systems. You can do this by removing the fuel pump fuse and the ignition coil relays from the main fuse box.
2. Turn the key (or press the start button) to crank the engine for 10 to 15 seconds. The engine will spin but will not start.
3. Wait 30 seconds to let the starter motor cool down.
4. Repeat this cranking process three or four times. Watch the dashboard for the red oil pressure warning light to turn off, which means oil has reached the top of the engine.
5. Reinstall the fuel pump fuse and ignition relays. The engine is now safe to start.

Frequently Asked Questions (FAQ)