2015 Dodge Challenger Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2015 Dodge Challenger and How to Resolve Them

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
21% chance it's the
Spark Plugs
0%
15% chance it's the
Ignition Coil
0%
64% chance it's
Something else
The most common reasons a 2015 Dodge Challenger has rough idle are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
  • Spark Plugs: Worn or fouled spark plugs can lead to misfires, poor fuel economy, and difficulty starting the engine.
  • Ignition Coil: A faulty ignition coil can cause misfires, rough idling, and difficulty starting the engine due to inadequate spark delivery to the spark plugs.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2015 Dodge Challenger has rough idle?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Brake caliper failure occurs in two different ways, and they create different symptoms.

The caliper can become stuck, in which case it won't release the brake pads. The seized caliper will cause the vehicle to brake constantly on one side, forcing the car to move toward that side. This pulling will be accompanied by a strong odor from one wheel.

Another way calipers fail is by leaking. If the caliper leaks, the brake pedal will feel too easy to push, and will sink all the way to the floor when held. Braking will become less effective the longer this goes on. There may also be brake fluid leaking onto the wheel.

Here are a few common symptoms of worn-out brake pads:

  1. Low brake pad warning light is on: Not all vehicles are equipped with this system, but if yours is, this dashboard indicator light will likely be the first signal it’s time to replace your brake pads.
  2. Brakes start to squeal regularly: This is often one of the first signs of worn brake pads and is caused by a metallic piece built into brake pads for this exact purpose. This part contacts the brake rotor to make a squealing or whining noise when the pads are low.
  3. Brakes make loud grinding noise: If not addressed early enough, your brake pads may get so worn that the metal backing plate of the pad grinds against the metal rotor.
  4. Brake pads look thin: You may be able to visually check your brake pad thickness to determine if they need replacement.

Brake rotors are mainly maintenance free, but when they have been subjected to abnormally hard use, the heat they absorb can cause the metal to turn blue, and cracking to occur. When this occurs, customers often specify they have lost braking power, or the vehicle's brakes are making noise. There may be no symptoms at all related to changing the brake rotors, since it is recommended to change brake rotors on most modern vehicles when performing a standard brake service.

Most often, a brake system inspection will just be a routine portion of manufacturer specified maintenance, and will be performed at mileage intervals. In those cases, there will likely be no symptoms. However, when a brake system makes a funny noise, causes vibration, is hard to use, will not slow the vehicle, prevents the vehicle from driving, makes the vehicle pull to one side, or leaks brake fluid, the vehicle will need a visit dedicated to the inspection of the brake system.

What are the initial diagnostic steps to take for a rough idle in a 2015 Dodge Challenger?

When addressing a rough idle in your 2015 Dodge Challenger, it's essential to adopt a systematic diagnostic approach that begins with the simplest checks before progressing to more complex assessments. Start by examining the spark plugs, as worn or dirty plugs can significantly impact engine performance. Next, inspect the air filter for clogs that may restrict airflow, which is crucial for optimal engine function. Following this, evaluate the fuel system components, including the fuel injectors and filter, to ensure proper fuel delivery. Utilizing an OBD-II scanner can help identify any error codes that may indicate specific issues. Additionally, check the throttle body for cleanliness and functionality, as it plays a vital role in maintaining the correct air-fuel mixture. Don't overlook the importance of inspecting vacuum hoses for leaks, which can disrupt engine performance. Lastly, assess the idle air control valve, as a malfunction here can directly contribute to rough idling. By methodically working through these steps, you can effectively diagnose and address the rough idle issue in your Challenger.

What are the common causes of a rough idle in a 2015 Dodge Challenger?

When dealing with a rough idle in a 2015 Dodge Challenger, it's crucial to consider several common problems that could be at play. One of the primary culprits is a dirty or clogged air filter, which can significantly restrict airflow to the engine, leading to performance issues. Additionally, faulty spark plugs are notorious for causing misfires, which can manifest as a rough idle. Another potential issue is vacuum leaks; these can disrupt the delicate balance of the air-fuel mixture, resulting in an unstable idle. Fuel system problems, such as clogged fuel filters or injectors, can also hinder engine performance and contribute to rough idling. Furthermore, ignition system malfunctions, including issues with ignition coils or distributors, can negatively impact idle quality. Lastly, a dirty or malfunctioning throttle body can disrupt airflow, exacerbating the rough idle issue. By systematically checking these components, DIYers can identify and address the root cause of the rough idle, ensuring their Challenger runs smoothly.

How urgent is it to address the rough idle in a 2015 Dodge Challenger?

Addressing a rough idle in your 2015 Dodge Challenger should not be overlooked, as it can indicate serious underlying issues that may escalate if left untreated. Symptoms such as a rough idle can stem from problems like faulty spark plugs, clogged fuel injectors, or a malfunctioning oxygen sensor, all of which can lead to decreased fuel efficiency and increased wear on your engine. Ignoring these signs can result in more severe complications, including engine misfires, stalling, or even complete engine failure, which can be both dangerous and costly to repair. While a rough idle may not pose an immediate safety risk, it is crucial to address it promptly to avoid further damage and ensure your vehicle operates at its best. Regular maintenance and timely intervention can help you maintain the health of your Challenger, ultimately saving you time and money in the long run.

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2015 Dodge Challenger Rough Idle: Causes & Repairs