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5557908 6494203 Ignition Coil For Cummins
Your Cummins Z15 or N15 gas truck misfires? The 5557908 ignition coil fixes it. Also known as 6494203, this direct-fit replacement matches OEM specs and bolts on in minutes. Fits Z15, 15N, N15, and ISX15 natural gas engines. In stock — ships within 48 hours. Email info@rjtparts.com or WhatsApp us for a quote.
5557908 6494203 Ignition Coil for Cummins Z15 N15 ISX15 Natural Gas Engine | RJT PARTS
Product Overview
The 5557908 ignition coil powers the spark plugs in Cummins 15-liter natural gas engines. It steps up 12V battery current to the high voltage needed for reliable combustion in heavy-duty truck and industrial applications. This part also carries the interchange number 6494203 — both numbers refer to the exact same coil.
RJT PARTS supplies the 5557908 / 6494203 coil as a direct-fit aftermarket replacement. It matches the original Cummins mounting footprint and electrical connector, so installation takes minutes. We design this coil for the Z15, 15N, N15, and ISX15 natural gas platforms — engines that pull heavy loads and run long hours.
Every coil passes bench testing for insulation resistance and spark output before we ship it. Whether you need one unit for a roadside repair or a pallet for fleet maintenance, RJT PARTS delivers fast.
Cross-Reference OEM Numbers
| OEM Number | Status | Notes |
|---|---|---|
| 5557908 | Primary | Most commonly referenced number |
| 6494203 | Interchange | Direct replacement for 5557908 (confirmed by Cummins) |
| R80884 | Alternate | Used in some domestic catalogs |
Important: 5557908 and 6494203 are the same physical part. Order either number and you receive an identical coil. This family does not interchange with the 3964547 / 5310989 series — those fit 8.3L and 8.9L engines, while 5557908 fits 15L platforms.
Compatible Cummins Engine Models
| Engine Series | Displacement | Common Applications | Fuel | Coils per Engine |
|---|---|---|---|---|
| Z15 / 15N | 15L | Heavy-duty trucks, tractors | CNG / LNG | 6 |
| N15 | 15L | National VI emission trucks, buses | CNG / LNG | 6 |
| ISX15 Gas | 15L | Trucks (2010–2015) | CNG / LNG | 6 |
Note: This coil fits 15-liter natural gas engines only. It does not fit diesel versions of the ISX15 or N15. Diesel engines use compression ignition and require no ignition coil.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Name | Ignition Coil |
| OEM Numbers | 5557908, 6494203 (cross: R80884) |
| Engine Make | Cummins |
| Compatible Models | Z15, 15N, N15, ISX15 (Natural Gas) |
| Displacement | 15L |
| Input Voltage | 12V DC |
| Output Type | High-voltage spark |
| Mounting | Bolt-on, OEM footprint |
| Connector | OEM-matching electrical plug |
| Quantity per Engine | 6 |
| Condition | New, aftermarket |
| Testing | 100% bench tested |
| Warranty | 6-12 months |
| Lead Time | 1–3 days (stock) |
Key Features
- Built for 15L platforms. Designed to handle the higher cylinder pressures and heat of Cummins’ largest gas engines.
- Dual-number compatibility. 5557908 and 6494203 interchange — no confusion when ordering.
- Heat-resistant housing. Epoxy-sealed construction withstands under-hood temperatures up to 150°C.
- Consistent spark energy. Maintains stable voltage from idle to full-load RPM.
- Plug-and-play install. Matches OEM connector and mounting points — no wiring modifications.
When to Replace
Watch for these signs of a failing 5557908 coil:
- Engine misfire under load or at highway speed
- Check engine light with codes P0300–P0306
- Loss of power and increased fuel consumption
- Rough idle or hesitation on acceleration
- Visible cracks, carbon tracking, or burn marks on the coil body
Fleet tip: On high-mileage Z15 or N15 engines, replace all six coils during a major tune-up. Mixed-age coils cause uneven combustion and shorten the service life of newer units. RJT PARTS offers discounted 6-coil engine sets.
Installation Notes
- Disconnect the negative battery cable.
- Remove engine covers and intake components to access the coil pack.
- Unplug the electrical connector from the faulty coil.
- Remove the hold-down bolt and pull the coil straight off the spark plug.
- Compare the old coil with the new 5557908 / 6494203 unit to confirm matching dimensions.
- Apply dielectric grease to the spark plug boot before installation.
- Seat the new coil and torque the mounting bolt to Cummins factory specification.
- Reconnect the harness and battery. Clear fault codes and run the engine to verify.
Follow Cummins service manual lockout/tagout procedures for natural gas fuel systems before servicing.
Why RJT PARTS
RJT PARTS specializes in heavy-duty engine replacement parts for the global aftermarket. We know that a downed 15L truck costs money every hour, so we keep the 5557908 / 6494203 coil on the shelf and ready to ship.
- Verified fitment. We cross-check every order against Cummins part catalogs and engine serial numbers.
- Fast dispatch. In-stock orders leave our warehouse within 48 hours of payment.
- Flexible quantities. Order one coil for an emergency or 500 for fleet stock.
- Bulk discounts. Tiered pricing at 10, 50, and 100+ pieces.
- Worldwide shipping. DHL, FedEx, air freight, and sea freight to over 100 countries.
- Technical support. Real parts specialists answer fitment questions within 24 hours.
Custom Product Attributes
| Attribute | Value |
|---|---|
| Supplier | RJT PARTS |
| Part Name | Ignition Coil |
| OEM No. | 5557908, 6494203 |
| Cross Ref. | R80884 |
| Engine Brand | Cummins |
| Engine Model | Z15, 15N, N15, ISX15 |
| Displacement | 15L |
| Fuel Type | CNG / LNG (Natural Gas) |
| Voltage | 12V |
| Qty/Engine | 6 pcs |
| Condition | New Aftermarket |
| Warranty | 12 Months |
| MOQ | 1 pc |
| Shipping | DHL / FedEx / Air / Sea |
| Payment | T/T, PayPal, Western Union, Trade Assurance |
FAQ
Q: Are 5557908 and 6494203 the same part?
A: Yes. Cummins lists 6494203 as a direct interchange for 5557908. Both numbers describe the identical ignition coil.
Q: Will this coil fit a Cummins ISX15 diesel engine?
A: No. The 5557908 fits the natural gas (CNG/LNG) version of the ISX15 only. Diesel ISX15 engines use compression ignition and do not need ignition coils.
Q: How many coils does a Z15 engine need?
A: The Cummins Z15 / 15N is a 6-cylinder engine, so it uses 6 ignition coils — one per cylinder.
Q: Can I use the 3964547 coil instead of 5557908?
A: No. The 3964547 fits 8.3L and 8.9L engines (CGE8.3, 6CT, ISL). The 5557908 fits 15L platforms (Z15, N15, ISX15). They are not interchangeable.
Q: What is the warranty?
A: 12 months from the date of delivery. We replace any coil that fails due to manufacturing defects.
Q: Do you ship to my country?
A: Yes. We ship worldwide. Common destinations include Southeast Asia, the Middle East, Africa, South America, and Eastern Europe.
Request a Quote
Need the 5557908 / 6494203 ignition coil for a Cummins Z15 or N15 engine? RJT PARTS has it in stock and ready to ship.
Send your part number, quantity, and destination country to info@rjtparts.com, or message us on WhatsApp for an instant quote. We reply within 24 hours.
📧 info@rjtparts.com
💬 WhatsApp: +86 178 8245 4252
