Cadillac ELR (2014-2016) Ignition Coil: A Comprehensive Guide
Understanding how to diagnose and replace the unique ignition coil cassette in your ELR's range-extender engine.
- The ELR uses a single ignition coil 'cassette', not individual coils; the entire unit must be replaced if one part fails.
- Failure symptoms like shuddering and a flashing check engine light will only appear when the 1.4L gasoline engine is running.
- The ignition coil is the same part used in the 2011-2015 Chevrolet Volt.
- For reliability, consider premium aftermarket brands like Delphi, which is a known GM original equipment supplier.
Understanding Ignition Coil Failure in Your ELR
The 2014-2016 Cadillac ELR uses the same 1.4L gasoline engine as the first-generation Chevrolet Volt. This means they share many of the same parts, including the ignition coil. Unlike many cars that have an individual coil for each spark plug, the ELR uses a single, integrated unit called an ignition coil cassette or rail. This assembly contains all four ignition coils in one package. When one coil inside the cassette fails, the entire unit must be replaced. You cannot replace just one coil.
Symptoms of a Failing Ignition Coil
Because the ELR operates on battery power most of the time, you will only notice ignition coil problems when the gasoline range-extender engine kicks on. Symptoms often appear suddenly when the engine is under load, such as when accelerating or driving on the highway after the battery is depleted. Common signs include:
- Sudden Shuddering or Vibration: The most common symptom reported by owners is a violent shaking or shuddering when the gas engine starts. This is caused by an engine misfire.
- Flashing Check Engine Light: A blinking check engine light indicates a serious misfire that could damage your catalytic converter. You should not run the engine if this occurs.
- Reduced Engine Power: The car may feel sluggish or lack power when the gas engine is running.
- Rough Engine Sound: Instead of a smooth hum, the engine may sound like it's coughing or sputtering. 🎬 Watch: 6 common warning signs of a failing ignition coil
Choosing the Right Aftermarket Ignition Coil
When replacing the ignition coil on your ELR, you have several options ranging from premium OEM-equivalent parts to more budget-friendly alternatives. Since the ignition system is vital for the range-extender's reliability, choosing a quality part is important.
OEM vs. Aftermarket: The original equipment (OE) part for your Cadillac is made by ACDelco, General Motors' own parts brand. Aftermarket parts are produced by other companies. High-quality aftermarket brands often meet or exceed OE specifications and can be a more affordable option.
Aftermarket Brand Tiers for Your ELR
Based on industry reputation and known quality for GM vehicles, the available brands can be grouped into tiers:
- Premium (OEM-Equivalent): Brands like Delphi, Bosch, and NGK are top-tier choices. Delphi is a well-known original equipment supplier to GM, making their parts a trusted alternative to ACDelco. Bosch and NGK are also highly reputable for their ignition components.
- Mid-Grade (Reliable Aftermarket): Brands such as Standard Ignition (SMP), Walker Products, and Hitachi offer a good balance of quality and price. They are established names in the aftermarket and produce reliable components.
- Economy (Budget-Friendly): Brands like DriveWire, True Tech, and Global Parts provide a low-cost alternative. While functional, they may not offer the same longevity or material quality as premium or mid-grade options.
Pro Tip: When replacing your ignition coil cassette, it is highly recommended to replace the spark plugs at the same time. Old or worn spark plugs can cause a new ignition coil to fail prematurely.
🎬 See this walkthrough for replacing the coil and spark plugsCost Comparison
| Part Type | Estimated Cost |
|---|---|
| New OEM (ACDelco) | $150 - $250 |
| New Aftermarket | $94 - $228 |
| Shop Labor | $75 - $150 |
Frequently Asked Questions (FAQ)
Is the 2014-2016 Cadillac ELR ignition coil the same as a Chevy Volt's?
Yes, the 2014-2016 ELR shares its 1.4L engine and ignition coil cassette with the 2011-2015 Chevrolet Volt. Parts are interchangeable between these models.
Can I replace just one bad coil on my ELR?
No. The ELR uses an integrated ignition coil cassette, which houses all four coils in a single unit. If one internal coil fails, the entire assembly must be replaced.
Are there any recalls for the ELR ignition coil?
There are no specific recalls for the ignition coil on the 2014-2016 Cadillac ELR according to NHTSA data. Recalls were issued for other components like seat brackets and electronic stability control software.
How do I know for sure my ignition coil is bad?
A flashing check engine light combined with shuddering when the gas engine runs is a strong indicator. A mechanic can confirm this with a diagnostic scan tool, which will show misfire codes (e.g., P0300, P0301, P0302, P0303, P0304) pointing to the ignition system.
🎬 Watch: Diagnosing a P0300 misfire on this 1.4L engineHelpful Videos
Technical Specifications
OEM Part Numbers: 55579072 55577898 55575499 55573735 25195107
Direct replacement ignition coil cassette assembly for the 1.4L L4 engine. Contains four coils in a single unit with a 7-pin electrical connector.
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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.
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