A Ram 3500 Owner's Guide to Ignition Coil Replacement (2011-2024)
Diagnose and fix common Hemi engine misfires by understanding your truck's ignition coils.
- A rough idle, engine shaking, and a check engine light (P0300-P0308) are the most common signs of a bad ignition coil on a Ram 3500 Hemi.
- Do not drive with a flashing check engine light, as this can quickly destroy your catalytic converters, leading to a very expensive repair.
- High-quality aftermarket brands like NGK, Delphi, and Denso offer OEM-level performance and reliability for less than the Mopar part.
- Always replace the spark plugs at the same time as the ignition coils to ensure a complete tune-up and prevent premature failure of the new coils.
Is Your Ram 3500 Shaking, Misfiring, or Losing Power? It Could Be an Ignition Coil.
If your Ram 3500 with a Hemi V8 engine (5.7L or 6.4L) starts to run rough, idle poorly, or hesitate when you accelerate, a failing ignition coil is a very common cause. These coils work hard under the hood and are exposed to constant heat and vibration, which eventually causes them to wear out and fail. While they can last over 100,000 miles, failure is a matter of when, not if. Driving with a bad coil for too long can lead to unburned fuel damaging your expensive catalytic converters, turning a small repair into a major one.
Flashing Check Engine Light? Pull Over Safely.
A flashing check engine light signals a severe engine misfire. Continuing to drive can cause rapid and expensive damage to your catalytic converters. It is recommended to stop driving and have the vehicle towed to prevent further damage.
Common Symptoms of Ignition Coil Failure
- Engine Misfires: The most common symptom. You'll feel a noticeable shaking, shuddering, or stumbling from the engine, especially at idle or under load.
- Check Engine Light: A failing coil will trigger the check engine light. Common codes include P0300 (Random/Multiple Cylinder Misfire) or P0301-P0308, which point to a specific cylinder.
- Rough Idle: The engine will not run smoothly when stopped at a light, and the RPMs may fluctuate.
- Loss of Power: With one or more cylinders not firing correctly, your truck will feel sluggish and weak during acceleration.
- Worse Fuel Economy: When a cylinder misfires, fuel is still injected but not burned, wasting gas.
Choosing the Right Aftermarket Ignition Coil for Your Ram
When shopping for new ignition coils, you don't have to buy the expensive Mopar part from the dealer to get reliable performance. Many aftermarket brands are the original equipment (OE) suppliers for Chrysler and offer the same quality for less money.
Brand Quality Tiers
- Premium Aftermarket (OEM-Quality): Brands like NGK, Delphi, Denso, and Standard Ignition (SMP) are highly regarded and often manufacture the original parts for Mopar. They provide excellent reliability, fit, and performance. For a daily driven or work truck, these brands offer the best balance of quality and value.
- Performance Aftermarket: Brands such as FAST, Mishimoto, or Accel are designed for modified engines and may offer higher voltage output. For a stock Ram 3500, you are unlikely to see any noticeable performance gain over a premium aftermarket coil, and they often cost more.
- Standard / Economy Aftermarket: Brands like DriveWire, True Tech, or other store brands can be a budget-friendly option. However, quality can be inconsistent, and some online reviews for cheaper, unbranded coils mention a shorter lifespan. If you plan on keeping your truck for a long time, investing in a premium brand is often worth it.
Pro Tip: Swap Coils to Diagnose
If you have a misfire code for a specific cylinder (e.g., P0304 for cylinder 4), you can confirm the coil is bad before buying a new one. Simply swap the ignition coil from the misfiring cylinder with one from a known good cylinder. Clear the codes and run the engine. If the misfire code changes to the new cylinder, you've confirmed the coil is the problem.
Known Issues, Recalls, and TSBs
While engine misfires are a common issue for Ram trucks, there are no widespread recalls specifically for ignition coil failure on the 2011-2024 Ram 3500 gasoline models. Searches on the National Highway Traffic Safety Administration (NHTSA) database show recalls for other ignition system components, such as the ignition switch or relays on diesel models, but not the coil packs themselves. The most common cause of failure is simply age, heat, and vibration.
Estimated Cost of Ignition Coil Replacement
| Part / Service | Estimated Cost |
|---|---|
| Single New Aftermarket Coil | $35 - $90 |
| Single New OEM (Mopar) Coil | $80 - $150+ |
| Shop Labor (Single Coil) | $50 - $100 |
| Shop Labor (All 8 Coils) | $150 - $250 |
Costs are estimates and can vary based on your location and the specific parts chosen. Labor for the Hemi V8 is relatively low due to easy access.
Frequently Asked Questions (FAQ)
Should I replace all ignition coils at once?
It is not strictly necessary, but it is often recommended. Ignition coils are subjected to the same conditions, so if one fails due to age, others are likely to follow soon. Replacing them all at once can save you from future breakdowns and repeated labor costs. If you are replacing them yourself, you can save money by only replacing the failed coil.
How many ignition coils does my 2011-2024 Ram 3500 have?
If you have a gasoline engine, the number of coils matches the number of cylinders. The 5.7L Hemi V8 and 6.4L Hemi V8 🎬 Watch a helpful walkthrough for 5.7L Hemi coil and plug replacement. engines both have eight ignition coils. Diesel (Cummins) engines do not use ignition coils.
Do I need to replace my spark plugs when I replace the coils?
It is highly recommended. Worn or fouled spark plugs can put extra strain on the ignition coils, causing them to fail prematurely. Since you already have access to the spark plugs when replacing the coils, changing them at the same time is a smart and cost-effective maintenance step. The Hemi engines have 16 spark plugs 🎬 See how to replace both spark plugs and coils together. (two per cylinder).
Is replacing Ram 3500 ignition coils a DIY job?
For the 5.7L and 6.4L Hemi engines, yes. It is a very straightforward job for a DIY mechanic. Each coil is held in place by one or two 10mm bolts and is easily accessible on top of the engine. The entire job can typically be done in under an hour with basic hand tools.
🎬 Watch this step-by-step guide to replacing your 6.4L ignition coils.Helpful Videos
Technical Specifications
OEM Part Numbers: 56029129AA 56029129AF 68238603AA
This vehicle uses a Coil-on-Plug (COP) ignition system. The 5.7L and 6.4L Hemi V8 engines require 8 ignition coils. The 5.7L Hemi uses two spark plugs per cylinder but only one ignition coil.
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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.
- Ram 3500:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Ram 3500 Shaking, Misfiring, or Losing Power? It Could Be an Ignition Coil.
- Flashing Check Engine Light? Pull Over Safely.
- Common Symptoms of Ignition Coil Failure
- Choosing the Right Aftermarket Ignition Coil for Your Ram
- Brand Quality Tiers
- Pro Tip: Swap Coils to Diagnose
- Known Issues, Recalls, and TSBs
- Estimated Cost of Ignition Coil Replacement
- Frequently Asked Questions (FAQ)
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