Ford Transit-350 (2015-2024) Direct Ignition Coil Replacement Guide
Diagnose a misfiring engine in your Transit-350 and choose the right aftermarket ignition coils to restore power and reliability.
- A flashing check engine light indicates a severe misfire; pull over to prevent expensive catalytic converter damage.
- Water leaking onto the engine is a known cause of coil failure on Transits; check for signs of corrosion in the spark plug wells.
- For reliability, choose high-quality aftermarket coils like Denso, which is often the original manufacturer for Ford.
- Always replace spark plugs when replacing ignition coils to ensure longevity and performance.
Is Your Transit-350 Running Rough? It Could Be an Ignition Coil
If your 2015-2024 Ford Transit-350 has started to run poorly, especially with a check engine light, a failing ignition coil is a very common cause. These vans, whether equipped with the 3.7L or 3.5L EcoBoost engine, rely on individual ignition coils for each cylinder. When one coil weakens or fails, it can cause a range of problems from a shaky idle to a significant loss of power. Fortunately, this is a repair most owners can perform themselves with basic tools.
🎬 Watch: Step-by-step ignition coil replacement for the 3.7L V6 engine.Known Issue: Water Intrusion
A known issue on some Ford Transits involves water from the rain tray dripping directly onto the engine. This water can seep into the spark plug wells, causing the ignition coils and spark plugs to corrode and fail prematurely. This issue most commonly affects cylinders 4 and 5. 🎬 See how to fix water-damaged coils on cylinders 4 and 5. After replacement, some mechanics apply a bead of silicone around the new coil boots to help seal them against the valve cover for added protection.
Choosing the Right Aftermarket Ignition Coil
When replacing ignition coils, you don't have to buy the expensive OEM Motorcraft parts. High-quality aftermarket brands can offer the same or better performance for less money. For a work vehicle like the Transit, reliability is the top priority.
- Top Tier (OEM Equivalent): Denso is widely reported to be the original equipment manufacturer (OEM) for many Ford ignition coils. Choosing Denso is essentially like buying the Motorcraft part without the Ford branding, often at a significant discount. They are known for quality and reliability, making them a top choice for Transit owners.
- Reputable Aftermarket: Brands like Hella and Delphi are well-regarded in the auto parts industry and produce coils that meet or exceed OEM specifications. They provide a good balance of quality and cost.
- Performance Brands: Accel and Granatelli are often associated with high-performance applications. While they may offer benefits like increased spark energy, some users report mixed results, and for a stock work van, their extra cost may not be justified.
- Standard Aftermarket: Brands like Karlyn STI and Prenco fall into the standard replacement category. While more budget-friendly, their long-term durability can sometimes be a gamble compared to top-tier brands. Given the labor involved in accessing the rear coils on some Transit engines, it's often worth spending more on a reliable coil to avoid doing the job twice.
Pro Tip: Replace Coils and Plugs Together
It is highly recommended to replace the spark plugs at the same time as the ignition coils. Worn or fouled spark plugs can put extra strain on the new coils, causing them to fail prematurely. Since you already have everything apart, replacing the plugs adds minimal extra labor and ensures the entire ignition system is refreshed. 🎬 Watch this DIY guide for 3.5L EcoBoost coil and plug replacement. Some owners report that a bad spark plug can be the root cause of a misfire, even when a coil is suspected.
Cost to Replace Ford Transit-350 Ignition Coils
| Part Type | Price Range (Single Coil) | Price Range (Set of 6) |
|---|---|---|
| New OEM (Motorcraft) | $45 - $70 | $270 - $420 |
| New Aftermarket (Top Tier) | $40 - $60 | $240 - $360 |
| New Aftermarket (Budget) | $25 - $40 | $120 - $200 |
Note: Prices are estimates and can vary based on brand and supplier. The provided inventory price range is $39.77 - $570.82, which may include individual coils, sets, and high-performance options.
Frequently Asked Questions
Can I replace just one bad ignition coil?
Yes, you can replace only the failed coil. However, ignition coils are often subjected to the same conditions and wear. If one has failed, others may not be far behind. For this reason, and because accessing some coils requires removing the intake manifold, many mechanics recommend replacing all six coils at once, especially on higher-mileage vehicles.
How do I know which coil is bad?
A check engine light will store a Diagnostic Trouble Code (DTC). A code from P0301 to P0306 indicates a misfire on a specific cylinder (e.g., P0301 is cylinder 1). Codes from P0351 to P0356 point directly to a fault in the ignition coil circuit for a specific cylinder (e.g., P0351 is cylinder 1's coil circuit). You can use an OBD-II scanner to read these codes. A common diagnostic trick is to swap the suspected bad coil with a known good one from another cylinder. If the misfire code follows the coil to the new cylinder, you've confirmed the coil is faulty.
Is this a difficult DIY job?
For the 3.5L and 3.7L V6 engines, the difficulty varies. The coils on the driver's side (Bank 2) are easily accessible. However, the coils on the passenger's side (Bank 1) are located under the intake manifold. Replacing these requires removing the manifold, which makes the job more complex and time-consuming. While still feasible for an experienced DIYer, it requires more patience and care.
Are there any recalls for Transit ignition coils?
As of late 2025, there are no specific NHTSA recalls for ignition coil failure on the 2015-2024 Ford Transit-350. However, Ford did issue a Technical Service Bulletin (TSB 19-2091) for 2015-2018 models related to water intrusion in the engine bay causing various drivability issues, including misfires. This TSB addresses sealing the cowl area to prevent water from reaching powertrain components.
Helpful Videos
Technical Specifications
OEM Part Numbers: UF646 DG549 UF825
The Ford Transit-350 with a gasoline V6 engine uses a Coil-on-Plug (COP) ignition system. Each cylinder has one dedicated ignition coil. The coils are held in place by an 8mm bolt.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Ford Transit-350:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Transit-350 Running Rough? It Could Be an Ignition Coil
- Known Issue: Water Intrusion
- Choosing the Right Aftermarket Ignition Coil
- Pro Tip: Replace Coils and Plugs Together
- Cost to Replace Ford Transit-350 Ignition Coils
- Frequently Asked Questions
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